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AT&T 555-540-200Issue 1, September 1989AT&T System 25Release 3, V 3Reference Manual

OVERVIEWOVERVIEWIntroductionThis reference manual provides general technical information on AT&T System 25 (System25). It includes a description o

Bridging of System Access Buttonsstatus LEDs of the SA button and the bridged appearances light steadily. If neither principalnor bridging user answer

FEATURES AND SERVICESAutomatic Intercom: Calls on Automatic Intercom buttons on the principal station are notaccessible from bridged call appearances

Bridging of System Access ButtonsDirect Group Calling (OGC): DGC calls arriving on SA buttons at a principal station canreceive bridging treatment at

FEATURES AND SERVICESPark: If a station is active on a bridged call appearance and activates Park, the call is parkedon the Personal Dial Code (PDC) n

Bridging of System Access ButtonsIf two bridged stations attempt to originate a call at the same time, and if the call iscompleted, the PDC number of

FEATURES AND SERVICESBusy-To-Idle ReminderDescriptionBusy-to-Idle Reminder alerts a multiline voice terminal user by a single ring as soon as abusy in

Call AccountabilityCall AccountabilityDescriptionThis feature allows calls made by system users from other users’ stations to be charged tothe callers

FEATURES AND SERVICESCall Accounting System (CAS)DescriptionCall Accounting is the collecting, processing, and use of information about all trunk call

Call Accounting System (CAS)● Multi-Function Mode: Allows the user to print reports, edit files, and run other PC-basedprograms while the CAS continu

Features and ServicesThe following table summarizes CAS station and account capacities.AT&T CALL ACCOUNTING SYSTEMSCAS Model Stations Account Code

OVERVIEWSYSTEMCALL ACCOUNTINGCONTROLSOFTWARE ORRS232COMPLEXSMDR PRINTERSYSTEM ADMINISTRATIONTERMINAL ORRS232MS-DOS PC WITHADVANCEDADMINISTRATIONDIGITA

Call Accounting System (CAS)● DTR (data terminal ready) required from printer.● RTS (ready to send) and CTS (clear to send) not required.● No flow con

FEATURES AND SERVICESSYSTEM 25PART OFCABINETOCTOPUS PART OFCABLESIPZTN130C2CPU/MEMZ210AADAPT.C1355AFADAPT.C3Z3A4ADUC1CALLACCOUNTINGSYSTEMPART OFSI

Callback QueuingCallback QueuingDescriptionThis feature provides System 25 users with a simple way to complete calls to busy facilities(stations or tr

FEATURES AND SERVICESWhile off-hook on a queued call, a single-line user can transfer or conference thecall.● On-Hook QueuingThe caller can hang up af

Callback Queuing● Callback CancellationThe user can cancel a call that was queued manually or automatically. At a multilineset, if the call is queued

FEATURES AND SERVICESConsiderationsCallback Queuing saves time for users because they can avoid repeated redialing of busynumbers. It allows trunks t

Callback QueuingBridging of System Access Buttons:Calls originated on Bridged Access (BA) buttons canbe queued. On callback attempts, only the origina

FEATURES AND SERVICESExclusion: pressing the EXCLUSlON button does not drop a queued call. The EXCLUSIONbutton’s status LED tracks the status LED of

Callbaok QueuingNote: It is highly recommended that queue size be set to either 0 or 64, not to some numberin between.● Assign the minimum time betwee

Features and ServicesCalling RestrictionsDescriptionDesignated voice and data terminals can be restricted from making certain types of calls. Availabl

OVERVIEWbe used to set up connections between data terminals, word processors, personalcomputers, and host computers. System 25 uses intelligent port

Calling RestrictionsEqual Access:Allows equal access to all Interexchange Carriers (IXC) when a station is administered for IXC+1and/or IXC+011 dialin

Calling RestrictionsFacility Access Restriction:Any station may be denied dial access to the local CO and/or to all othergroup). A station so restrict

Features and ServicesPooled Facility—Direct Access: Toll restricted stations receive their class of service tollrestrictions whet her a Direct Facili

Call Management System (CMS)Call Management System (CMS)DescriptionThe Call Management System (CMS) is an automatic call distributor that directs spec

FEATURES AND SERVICES● If no agent has become available by the end of the delay message, CMS puts the callinto the main split’s queue of waiting calls

Call Management System (CMS)ConsiderationsCMS is useful for businesses where particular groups or departments receive special typesof calls in high vo

FEATURES AND SERVICESCall Progress TonesCall Progress tones provide audible feedback on the status of calls during call setup. Thesetones are heard th

Call WaitingCall WaitingDescriptionThis feature allows a user at a busy voice terminal to be audibly alerted when another partyis calling. A voice ter

FEATURES AND SERVICESInteractionsThe following features interact with Call Waiting.Attendant Camp-On: Trunk calls camped ontoover other waiting calls

Command ModeCommand ModeThis feature allows data terminal users to originate data and voice calls and change (or view)their data port options.(Refer a

OVERVIEW— STARLAN NETWORK Access (Release 2 of STARLAN only)— DS1 Facility interface.● Networking Capability— Remote Access— Tie Trunks— Tandem Trunki

FEATURES AND SERVICES<Voice call>:The data terminal user can originate a call for an on-premises source voice or data terminalto a remote term

Command ModeTable 2-G. Partial List of Permissible Data Port (TN726) OptionsOPTIONDEFINITIONSpeed (61-68)†Autobaud, Low*,300, 1200, 2400, 4800, 9600,

FEATURES AND SERVICESTable 2-H. Typical Option Profiles for Data Port EndpointsOptionsSpeed (highest)ParityEnable Command ModePermit MismatchLocal Ech

Communications Access Manager (CAM)Communications Access Manager (CAM)The Communications Access Manager (CAM) program facilitates communication betwee

FEATURES AND SERVICESEX-RS232CCOMMUNICATIONSDRIVERACCESSMANAGERNAUCOMDRIVERPERSONAL COMPUTERRS-232-CPORTSTARLANNAU PORTFigure 2-13. Communications Acc

ConferenceConferenceDescriptionThis feature allows up to five parties, including the conference originator, to participate in aconference call. Any vo

FEATURES AND SERVICESInteractionsThe following features interact with Conference.Account Code Entry, Forced (FACE): Calls can be conference in both d

ConferenceExclusion: Exclusion may be invoked before establishing a conference. If it is invoked after theconference is established, all internal con

Features and ServicesConference DropDescriptionThis feature allows a voice terminal user, except for the attendant at a Switched Loop AttendantConsole

Conference DropConsiderationsConference Drop allows users to conference lines appearing on their terminals and thenremove them from the conference whe

OVERVIEWBusiness Communications NeedsThe remainder of this section describes how System 25’s features may be used to satisfy acustomer’s communication

FEATURES AND SERVICESCoverage, GroupDescriptionThis feature allows calls to covered stations to be redirected to a group of covering stations.A total

Coverage, Groupterminal. If there is no idle Cover button on any covering terminal, either individual or group,the call will not receive coverage and

FEATURES AND SERVICESConsiderationsCoverage provides a way to redirect calls to alternate answering positions. The feature isversatile enough to permi

Coverage, GroupWhen forwarding to an outside number, coverage may only occur in one case: the forwardinghad been activated using a trunk group’s facil

FEATURES AND SERVICESCallback Queuing: Callback calls to the originator do not send ring signals to its coveragestations. If a call is queued for a s

Coverage, GroupAdministration Requirements (Standard Group Coverage)System:● Provide Coverage ringing on internal calls (yes or no; default = yes).If

FEATURES AND SERVICESCoverage, IndividualDescriptionThis feature is similar to Group Coverage, covered in the preceding feature description. Theprimar

Coverage, IndividualInteractionsThe following features interact with Individual Coverage.Attendant Console, Direct Trunk: When a coverage call rings

FEATURES AND SERVICESAdministration RequirementsVoice Terminal Port:●Individual Coverage button (button function # 12):—Individual Coverage PDC (1-999

DS1 Facility InterfaceDS1 Facility InterfaceDescriptionThe DS1 facility interface feature provides connectivity between System 25 and a T1 facility.Th

`OVERVIEW● The Call Management System provides Automatic Call Distribution (ACD) service andassociated call traffic and agent performance reports.● Di

FEATURES AND SERVICESSignaling TypesSignaling types refers to signaling used by DS1 on the T1 facility. Two signaling types can beused in System 25, R

DS1 Facility InterfaceWhen digital signals are transmitted over a network of digital communications links, switchingnodes, multiplexers, and transmiss

FEATURES AND SERVICESNon-AT&T Digital PBX EndpointsTo determine if the System 25 can be connected to another vendor’s PBX, several itemsmust be ve

DS1 Facility InterfaceThe trunks terminating on a 4ESS switch must be administered as either tie or direct inwarddialing trunk types. The tie trunks c

FEATURES AND SERVICESsynchronized to the AT&T Reference Frequency, then it can be used as the synchronizationreference for the System 25.DS1 Inter

DS1 Facility InterfaceAdministration RequirementsThe administration of DS1 interface CP is completed by accessing the Port, High DensityCircuit (HI D

FEATURES AND SERVICESThe items to administered under System include (default):● Assign Primary Synchronization Source (No slot)● Enable Automatic Sync

DS1 Facility Interface131O FEET MAXIMUMCABLING DISTANCESYSTEM 25SYSTEM 25TN 767C6D CONNECTORCABLE (NOTE)TN767< >NOTE:Figure 2-15. DirectApart,FO

FEATURES AND SERVICESS25TN767CSUDSX-1PROTECTION(NOTE)CIRCUIT655 FEETREPEATEREDMAXIMUMDS1 LINECSUDSX-1PROTECTIONDS1(NOTE)CIRCUIT655 FEETMAXIMUMNOTE:USE

DS1 Facility InterfaceMICROWAVEINTERFACEMICROWAVEINTERFACES25TN767DSX-1DSX-1DS1655 FEETMAXIMUMLIGHT-GUIDELIGHT-GUIDEINTERFACEINTERFACEINFRAREDINTERFAC

OVERVIEW● Station Hunting provides automatic redirection of incoming calls to an idle member ofa hunt group when the called party is busy.● Pickup all

FEATURES AND SERVICESData Call SetupThis feature allows a user to originate calls from25 provides three methods of data calling:● Dialing from a data

Data Services OverviewData Services OverviewSystem 25’s data features provide switched data transmission at up to 19,200 bps (RS-232interface), and a

FEATURES AND SERVICESThe following describes the categories and attributes of each:1.DTE DevicesThis group of data endpoints have one thing in common:

Data Services Overviewb. ASCII Data Terminal With KeyboardThis category can be subdivided into two classes: (1) basic terminals, and (2)intelligent, p

FEATURES AND SERVICESendpoints is important for users who provide their own modems, connected todedicated trunks or private lines, for internal modem

Data Services Overviewe.Data Terminal Dialing ModeData Terminal Dialing is a data feature accessed via Command Mode. It provides aprocedure to establi

FEATURES AND SERVICESb. Data Terminal DialingData Terminal Dialing provides call setup from terminals and host computersc. Transfer To DataTransfer To

Data Terminal DialingData Terminal DialingDescriptionThis feature allows users to onginate (place) data calls from a data terminal. Voice terminaldial

FEATURES AND SERVICESPause characters may be used consecutively if a longer pause is required. Note that System25 cannot detect tones, such as a secon

Data Terminal DialingTable 2-1.Call Progress Messages for Data Terminal DialingDisplayedMessageApplicationDIAL:Placing a callRINGINGPlacing a callBUSY

OVERVIEW● Automatic Route Selection provides manager defined routing of calls over thetelecommunications network based on preferred routes (normally t

FEATURES AND SERVICESAnswering Endpoint:When the dialed endpoint is alerted, the user receives “INCOMING CALL-”. (The calledterminal will auto-answer

Dial Access to Message Waiting IndicatorsDial Access to Message Waiting IndicatorsDescriptionThis feature allows users to turn on or turn off the mess

FEATURES AND SERVICESDial PlanThe dialing plan for System 25 is based on the concept that, whenever possible, calls shouldbe placed to individuals rat

Dial Plan●●●●●●●●●●●●●●●●●✶ — PAUSE character (in programmed numbers)#100-#189 — System Speed Dialing Codes#190-#199 — Virtual Facility Codes#20-#39 —

FEATURES AND SERVICESData Dial Codes (DDCs)At the time of installation each digital data endpoint will be assigned a Data Dial Code (DDC)that serves a

Dictation System AccessDictation System AccessDescriptionThis feature permits voice terminal users to access and control customer-owned dictationequip

FEATURES AND SERVICESVoice Terminal Port:● Assign DSS access buttons, as desiredHardware RequirementsCustomer-provided dictation equipment suitable fo

Digital Tape Unit (DTU)Digital Tape Unit (DTU)The Digital Tape Unit (Figure 2-23) is a RS-232 device used to record administrationtranslations. The DT

FEATURES AND SERVICESSYSTEM 25 PART OFCABINET OCTOPUSCABLEPART OFSIPZTN130C2Z210AC1355A/AFCPU/MEM ADAPT.ADAPT.LEGEND:C1-MODULAR CORD (D8W-87) - PEC 27

Direct Group Calling (DGC)Direct Group Calling (DGC)DescriptionDirect Group Calling (DGC) allows incoming calls to be directed to a specific group oft

OVERVIEW● Pooled Facility-Dial/Direct Access allows both multiline and single-line voice terminalusers to access a common pool of trunks for outgoing

FEATURES AND SERVICESConsiderationsDGC groups are particularly useful when the answering group receives a high volume ofcalls. Call completion time is

Direct Group Calling (DGC)Personal Lines:An outside line directed to a DGC group can be assigned buttonappearances in addition to the DGC group assign

FEATURES AND SERVICESDirect Group Calling Delay AnnouncementDescriptionThis feature provides a recorded announcement to an outside (trunk) caller wh

Direct Group Calling Delay AnnouncementHardware RequirementsThe announcement device must automatically hang up at the end of each call so that thein

FEATURES AND SERVICESDirect Inward Dialing (DID)DescriptionDirect Inward Dialing (DID) allows incoming dialpulse type calls to reach specific individu

Direct Inward Dialing (DID)InteractionsThe following features interact with Direct Inward Dialing.Attendant Camp-On: DID calls are not provided Atten

FEATURES AND SERVICESPooled Facility Access: Access to pooled facilities via DID is permitted. This includes accessto WATS, FX, tie trunks, private li

DirectoryDirectoryDescriptionThis feature allows the user of a voice terminal where the Display feature is administered tosearch the system’s integrat

FEATURES AND SERVICESThe user of a non-attendant display set can exit from Directory Mode directly to ProgramMode by moving the program switch on the

DirectoryAdministration RequirementsAdministration of the Display feature enables Directory.Hardware RequirementsThe Directory feature can be used onl

OVERVIEWEfficient internal call termination is supported with the following features.● Distinctive Ringing provides various patterns of ringing to all

FEATURES AND SERVICESDirect Station Selection (DSS)DescriptionDirect Station Selection (DSS) allows one-button access to another voice terminal, a pag

Direct Station Selection (DSS)Coverage: DSS calls placed to an individual with Coverage will receive standard coveragetreatment.Display: Operation of

FEATURES AND SERVICESDisplayDescriptionThis feature provides visual alphanumeric call information at multiline voice terminalsequipped with display mo

DisplayDisplay Operation ModesMost normal call handling activity, such as placing and answering calls and using features,takes place in“Normal Mode.”C

FEATURES AND SERVICES●●●●routing information, System Speed Dialing numbers, etc.]terminal user.Displays for redirected/coverage and returning/third-pa

DisplaySpecial DescriptorsThe descriptors summarized in Table 2-J appear on displays to provide special informationabout calls. These symbols consist

FEATURES AND SERVICESStandard Call DisplaysThe following basic displays illustrate the arrangement of information on the screen(s) forsome of the most

Displaynumber and name; the call type designator appears in position 16 (here, “b”indicates that the covered party was busy).Screen 1>344 Carter,LS

FEATURES AND SERVICES—The system time-out for Account Code Entry is reached.—The user selects another button that overwrites the display.● Busy-To-Idl

Display●●●●FLEX DSS Button OperationOperation of a FLEX DSS button that is not programmed with an extension numbergenerates the display NO INFORMATION

TO ORDER COPIES OF THIS MANUAL (INCLUDES ADDENDUM)Call: AT&T Customer Information Center on 1-800-432-6600In Canada Call 1-800-255-1242Write: AT&a

OVERVIEW● Circuit switched data communications up to 19,200 bps (RS-232 interface) providecircuit switched connections from asynchronous data terminal

FEATURES AND SERVICES● Send All CallsWhen Send All Calls isinformation.If the callsdescriptor “c” appears inScreen 1● Transferinvoked, the sending st

DisplayConsiderationsThe Display feature provides valuable call information with a minimum of effort on the part ofthe voice terminal user.Interaction

FEATURES AND SERVICESWhen a nondisplay station originates a trunk call, then conferences the call with an insidedisplay station and drops off the disp

Distinctive RingingDistinctive RingingDescriptionThis feature allows users to distinguish between different types of incoming calls. Thesystem provide

FEATURES AND SERVICESEnd-To-End SignalingDescriptionThis feature allows multiline voice terminals to send touch-tone (DTMF) signals over the DDDnetwor

ExclusionExclusionDescriptionThis feature allows multiline voice terminal users to keep other users with appearances ofthe same Personal Line from lis

FEATURES AND SERVICESCoverage: If a coverage receiver invokes Exclusion after answering a coverage call, all otherterminals (including the attendant

Expert ModeExpert ModeDescriptionExpert Mode is an enhancement to the Command Mode feature that provides an alternativemethod of performing the full r

FEATURES AND SERVICESIf the user enters “D” and then a RETURN, the system will prompt for the data endpointnumber as follows:Command: DDIAL:The user m

Expert ModeExamples:Command: S +1200 -300 +4800Add 1200 and 4800 baud to the availablespeeds, remove 300 baudCommand: PEChange Parity to EvenCommand:

OVERVIEW● The integrated voice-data dialing plan recognizes the different types of dataendpoints (digital/analog and remote/local) in a connection and

Features and ServicesExtended StationsDescriptionAllows single-line voice terminals to be located at distances from 2000 to 17,500 feet from thesystem

External AlertsExternal AlertsDescriptionExternal Alerts provide standard station ringing at locations away from the called stations.This feature can

FEATURES AND SERVICESHardware RequirementsOrder line-activated alerting devices (e.g., bells) as required.An alerting device operating on a line separ

External AlertsSYSTEM 25PART OFCABINETOCTOPUSCABLEPART OFSIPZTN79C2SIPW1C1B1 <C1TERMINALATL>ADAPT.T1LINE CPS1C8ALERTER C.U. V.T.ALERTA1LEGEND :A

FEATURES AND SERVICESFollowingDescriptionThis feature allows users whoat other inside voice terminals.are away from their own voice terminals to recei

FollowingCalls Placed to A PDC:Calls to a PDC that is not signed in at an “away” terminal are directed to the home terminaland receive that terminal’s

FEATURES AND SERVICESinstead be provided Reorder Tone.Finally, if the FPDC is not signed in, and if the attendantposition is not administered to handl

ForwardingForwardingDescriptionThis feature allows users to direct their incoming calls to another (forwarded-to) voiceterminal where they will be loc

FEATURES AND SERVICESWaiting is administered at the forwarded-to station.Forwarding Calls to Locations Outside System 25The user activates Forwarding

ForwardingAfter dialing the Remote Access trunk and the barrier code, the caller receives second dialtone. The caller then enters access code #70 and

OVERVIEWGrowth & RearrangementHistorical data indicates that clients in the System 25 station range have a need forcommunications systems capable

FEATURES AND SERVICESA given station can receive forwarded calls from any number of other stations.Note:When incoming trunk calls are forwarded to out

ForwardingDisplay: Reception of a forwarded call follows the standard format for a redirected call, with the calltype descriptor “f” in position 16 of

Features and ServicesTrunk Groups, Loop Start: If System 25 uses Loop Start trunks, calls can be forwarded to remotelocations only if Trunk-to-Trunk T

Hands-Free Answer on Intercom (HFAI)Hands-Free Answer on Intercom (HFAI)DescriptionThis feature allows the following voice terminals to provide hands-

FEATURES AND SERVICES— The set generates a tone burst over its speaker to indicate an incoming call.— The parties may converse.The called party can sp

Hands-Free Answer on Intercom (HFAI)Voice Terminals without Speakerphone or Headset AdaptersThe HFAI feature is activated by pressing the AUTO ANS but

FEATURES AND SERVICESHeadset Adapter AdjunctDescriptionThe headset adapter adjunct is an interface device for connecting a headset to an associatedvoi

Headset Adapter AdjunctThe 500A Headset Adapter is powered locally by a 2012D Transformer, which plugs into a115V ac receptacle.Power from the transfo

FEATURES AND SERVICESSYSTEM 25CABINETZTN79PART OFHYBRIDOCTOPUS CABLEPART OF SIPLINE CPC2SIPW1C1VOICEADAPT.B1TERMINALT1C8502BHEADSETADAPTERLEGEND:B1 -T

Headset Adapter AdjunctSYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLEPART OF SIPC2SIPW1 B1Z400FC1VOICEADAPT.ADAPT.TERMINALT1C7C8PWR.SUPPLYP150

OVERVIEW● Tie Trunks for linking PBXs with dedicated private circuits for high volume calling.Dial access to stations, other trunks, answering groups

FEATURES AND SERVICESSYSTEM 25CABINETPART OFOCTOPUSCABLETN735METLINE CPPART OF SIPSIPC2W1C1MET SETADAPT.B1T1C7C8248B500AADAPT.HEADSETADAPTER2012DLEGEN

HoldHoldDescriptionThis feature allows users to temporarily disconnect from one call and either place or answeranother call. A single-line voice termi

FEATURES AND SERVICESMusic-On-Hold: A held party on an outside line will receive Music-On-Hold if provided.Personal Lines: A Personal Line cannot be

InspectionInspectionDescriptionThis feature enables the user at any voice terminal administered for the Display feature toperform the following functi

FEATURES AND SERVICES● Active Call Appearance ButtonThe normal call information pertaining to the call is displayed. If the display user isexcluded, E

InspectionThe user of a non-attendant display set can exit from Inspection directly to Program Mode byactivating the Program switch. However, to reent

Features and ServicesIntegrated Solution (IS)DescriptionThis feature is the enhancement to System 25 with a UNIX®-based computer (PC) acting as aMaste

Integrated SolutionFor Office Automation applications, there are no absolute requirements, but the customer’s needsshould be understood. For example,

Features and ServicesHardware RequirementsRequires appropriate cables and connectors for Administration and/or Call AccountingDescriptions of the SIP

Intercept Treatment With Reorder TonesIntercept Treatment With Reorder TonesDescriptionReorder tone (fast busy) is provided when a call cannot be comp

FEATURES AND SERVICESIntroductionAccount Code Entry, ForcedAccount Code Entry, OptionalAttendant Call ExtendingAttendant Camp-OnAttendant CancelAttend

FEATURES AND SERVICESInterdigit TimeoutsDescriptionThis feature allows an originating register to be made available for others if dialing is notcomple

Last Number DialedLast Number DialedDescriptionLast Number Dialed automatically saves the last number dialed from a multiline voiceterminal or ATL cor

FEATURES AND SERVICEScurrently stored on the button.Automatic Intercom: Numbers called using an Automatic Intercom button are not saved bythe Last N

Last Number DialedAdministration RequirementsLast Number Dialed is a default feature on all multiline voice terminals. One button isassigned to the fe

FEATURES AND SERVICESLeave Word CallingDescriptionLeave Word Calling (LWC) is available only when a Voice Message System (VMS) isconnected to the Syst

Leave Word Calling (LWC)ConsiderationsSystem 25’s Leave Word Calling feature provides an easy method to send “call me”messages by way of an attached V

FEATURES AND SERVICESHardware RequirementsA Voice Message System must be connected to the System 25 by way of a port on a ZTN78Tip Ring Line circuit p

Line SelectionLine SelectionDescriptionMultiline voice terminals may have many line (facility) appearances. There are three methodsby which a user may

FEATURES AND SERVICESIf a line rings at a multiline terminal when the terminal is busy on another call, Ringing LinePreference will not activate, even

Line SelectionPower Failure/Cold Start: On power-up, most multiline voice terminals will have no I-useLED lit and will not draw dial tone until a butt

Call AccountabilityCall Accounting System (CAS)Callback QueuingCalling RestrictionsCall Management System (CMS)Call Progress TonesCall WaitingCommand

FEATURES AND SERVICESLine Status and I-use IndicationsDescriptionProvides users with a usual indication of the status of feature buttons and lines app

Line Status and I-Use IndicationsInteractionsThe following features interact with Line Status and I-Use Indications.Attendant Console, Direct Trunk:

FEATURES AND SERVICESLocal DisplayDescriptionThis feature allows the user of a display-equipped voice terminal to operate the Time/Timercircuit built

Local DisplayThe terminal user can set any of the Local Display functions by performing the followingprocedure while not active on a call:1.If the clo

FEATURES AND SERVICESHardware RequirementsThe Local Display feature is available only on display-equipped multiline voice terminals.2-222

Manual SignalingManual SignalingDescriptionThis feature allows a user to signal another voice terminal. The user may do this at anytime, whether on-ho

FEATURES AND SERVICESAdministration RequirementsVoice Terminal Port:● Assign Manual Signaling (SIGNAL) button2-224

Message Center-Like Operation (SLAC Only)Message Center-Like Operation (SLAC Only)DescriptionA System 25 Switched Loop Attendant Console (SLAC) can be

FEATURES AND SERVICESMessage Center capability canbe supported in any of the following two-consoleconfigurations:● One dedicated Attendant Position an

Messaging ServicesMessagingDescriptionThese servicesServicesinclude features that light a Message LED to indicate that another station orthe attendant

DirectoryDirect Station Selection (DSS)DisplayDistinctive RingingEnd-To-End SignalingExclusionExpert ModeExtended StationsExternal AlertsFollowingForw

FEATURES AND SERVICESIf a user tries to turn on the Message LED at a voice terminal for which the user does notprovide Individual Coverage, Reorder To

Messaging ServicesHardware RequirementsThe Z3A Message Waiting Indicator (MD), if available, can be used on single-line voiceterminals not equipped wi

FEATURES AND SERVICESModem PoolingDescriptionAllows switched data connections between digital data endpoints and analog data endpoints.(Refer also to

Modem PoolingConversion resources are requlred for:● Data Terminal Dialing: To establish a data connection for calls originated viaTerminal Dialing t

FEATURES AND SERVICESAdministration RequirementsSystem (Pooled Modems):● Modem Request Code (1-9999; default = 820). Allows users to indicate a need f

Music-On-HoldMusic-On-HoldDescriptionThis feature provides music or other audible indication to a held party on an outside lineOn an outside call, if

FEATURES AND SERVICESPark: Parked calls (except parked conferences) receive music.Transfer: When a station user transfers a call to another station,

Music-On-HoldSYSTEM 25CABINETPART OFOCTOPUSCABLEPART OFSIPTN742C2SIPW1W1C5>MUSICOR>ADAPT.MOHB1SOURCEZTN78LEGEND:TN742 -ZTN78 -B1 -C2 -C5 -W1 -MO

FEATURES AND SERVICESSYSTEM 25CABINETPART OFOCTOPUS CABLEPART OF SIPTN742C2ORSIPW1ADAPT.MOHZTN78W136A VOICEW1B1C6MUSICCOUPLERSOURCEW12012DTRANSFORMERL

Night ServiceNight ServiceDescriptionAllows users to answer incoming calls on specified trunks when the attendant is not on dutyThere are two types of

Message Center-Like Operation (SLAC Only)Messaging ServicesModem PoolingMusic-On-HoldNight ServiceNight Service Delay AnnouncementsOff-Premises Statio

FEATURES AND SERVICESNote that at least one station must be designated as a NS receiver for this feature to workproperly. If only an announcement is r

Night ServiceTie Trunks: Dial-in Tie Trunks cannot be given night service treatment.Administration RequirementsTrunk Ports:● Assign trunk Class of Ser

FEATURES AND SERVICESNight Service Delay AnnouncementsDescriptionThis feature provides a recorded announcement forincoming trunk calls when the system

Night Service Delay AnnouncementsHardware RequirementsA suitable announcement machine is required for each announcement and must beconnected to a port

FEATURES AND SERVICESOff-Premises Stations (OPS)DescriptionAn Off-Premises Station (OPS) is a single-line voice terminal that is located in anotherbui

Out-of-Building StationsOut-of-Building StationsDescriptionSingle-line voice terminals and multiline 7300H series terminals may be directly connected

Features and ServicesPaging System AccessDescriptionThis feature provides users with dial access or feature button access to paging equipment.System 2

Paging System AccessSystem 25 supports all AT&T PagePac* voice paging systems. The following are the mostcommon interface arrangements for System

FEATURES AND SERVICESTie Trunks: Incoming Tie Trunk calls can access paging ports connected to Auxiliary Trunkcircuit packs.If administered as a Tand

Paging System AccessDetailed connection information is provided in Figures 2-36 and 2-37.Descriptions of the SIP (Station Interconnect Panel), TAE (Tr

Speakerphone AdjunctSpeed DialingSTARLAN NETWORK AccessStation HuntingStation Message Detail Recording (SMDR)Station-To-Station Message WaitingSystem

FEATURES AND SERVICESSYSTEM 25CABINETPART OF 25-PAIR CABLEPART OF66-BLOCKPAGING ORAW1278AW1C5TN763DICTATIONADAPTERB1SYSTEMC6D-181321LEGEND:TN763 -A -B

ParkParkDescriptionThis feature allows a user to put a call into a special hold/parked condition so that it can bepicked up from any voice terminal in

FEATURES AND SERVICESpressing an idle Park button.The status LED of the parked line on the Attendant Consolewinks and the status LED of the Park butto

ParkCallback Queuing: Queued calls cannot be parked unless they are part of a conference.Reorder tone is returned whenever an illegal park is attempt

FEATURES AND SERVICESPersonal Dial Code (PDC)DescriptionA Personal Dial Code (PDC) consisting of one to four digits is assigned to each voiceterminal

Personal Dial Code (PDC)Direct Station Selection: If an attempt is made to program a FPDC (rather than a PDC) on aFlex DSS button, Reorder Tone is re

FEATURES AND SERVICESPersonal LinesDescriptionThis feature provides a dedicated outside line for multiline voice terminal or ATL cordlesstelephone use

Personal LinesLine Selection (Prime Line Preference): Prime Line Preference may be assigned to aPersonal Line.Park: A parked Personal Line is bridgea

FEATURES AND SERVICESPickupDescriptionThis feature allows a user to answer a call ringing at another voice terminal. There are twoforms of Pickup: (1)

PickupIf no eligible calls are ringing, attempting pickup results in reorder tone.InteractionsThe following features interact with Pickup.Bridging of

FiguresFigure 2-1.Figure 2-2.Figure 2-3.Figure 2-4.Figure 2-5.Figure 2-6.Figure 2-7.Figure 2-8.Figure 2-9.Figure 2-10.Figure 2-11.Figure 2-12.Figure 2

Features and ServicesPooled Facility - Dial AccessDescriptionThis feature allows multiline and single-line voice terminal and ATL cordless telephone u

Pooled Facility - Dial AccessAdministration RequirementsVoice Terminal Port:● Restrictions - Refer to “Calling Restrictions” feature description.Trunk

Features and ServicesPooled Facility - Direct AccessDescriptionThis feature allows multiline voice terminal users to access a common pool of trunks vi

Pooled Facility - Direct AccessAdministration RequirementsVoice Terminal Port:● Assign Direct Facility Access (FACILITY) buttons.● Restrictions—Refer

Features and ServicesPower Failure Transfer (PFT)DescriptionThis feature provides service to and from the CO for a limited number of prearranged sing

Power Failure Transfer (PFT)Only FCC registered single-line voice terminals may be used for PFT stations. Rotary setsmust be used for dial pulse PFT t

FEATURES AND SERVICESFigure 2-38.10B Emergency Transfer Unit (ETU)2-264

Power Failure Transfer (PFT)SYSTEM 25CABINETTRUNKPORTTAECALLPROCESSORETUETU TO SWITCH ETU TO25-PAIR(TRUNK) CO-48VCPUTOADDITIONALADDITIONALETUsETUCENTR

FEATURES AND SERVICESNOTES:1. TRUNK AND STATION CONNECTIONS TO ETU 2-4 ARE SIMILAR TO ETU (1).2. THREE OF EIGHT STATION LINES (FROM ANALOG STATION CP)

ProgramProgramDescriptionThis feature enables system users to store numbers for access by feature buttons or codedialing. Multiline voice terminal use

FCC NOTIFICATION AND REPAIR INFORMATIONAT&T SYSTEM 25This telephone equipment is registered with the Federal Communications Commission (FCC) inacc

Figure 2-26.Figure 2-27.Figure 2-28.Figure 2-29.Figure 2-30.Figure 2-31.Figure 2-32.Figure 2-33.Figure 2-34.Figure 2-35.Figure 2-36.Figure 2-37.Figure

FEATURES AND SERVICESCHAR.USED IN PERSONAL SPEED DIALING NUMBERS✶Produces a 1.5 second pause.— Since System 25 does not have a Dial Tone detector,jud

ProgramTo Program a Number by Using the Code:1.Lift the handset and listen for dial tone.2.Dial #4 to enter the Program mode.3.Dial the number you wan

FEATURES AND SERVICESConsiderationsThe Program feature allows users toDSS/Repertory Dialing numbers. This ispersonnel responsibilities change.assign t

ProgramAdministration RequirementsVoice Terminal Port:● Assign FLEX DSS and REP DIAL buttons.● Allow Personal Speed Dialing on a per-station basis.2-2

FEATURES AND SERVICESRecallDescriptionUsers of single-line voice terminals that have RECALL buttons can obtain System 25 recalldial tone by pressing t

Remote AccessRemote AccessDescriptionThis feature allows a caller to dial into a System 25 from the public network using a predetermined7- or 10-digit

Features and ServicesIf a Remote Access call reaches an inside station, the station can transfer the call back out of thesystem, subject to System 25

Remote AccessInteractionsThe following features interact with Remote Access.Account Code Entry: This feature cannot be used by Remote Access callers.C

Features and ServicesProgram Mode: This feature cannot be used by Remote Access callers.Remote Initialization and Maintenance Service (RIMS): RIMS req

Remote AccessAdministration RequirementsSystem:● Enable barrier codes (yes or no; default = yes).● Assign DID remote access number (PDC or 0; default

Figure 2-52.Figure 2-53.Figure 2-54.Figure 2-55.Figure 2-56.Figure 2-57.Figure 2-58.Figure 2-59.Figure 2-60.Figure 2-61.Figure 2-62.Table 2-A.Table 2-

Features and Services2-276bThis page intentionally left blank.November 1995

Remote Administration InterfaceRemote Administration InterfaceDescriptionThis feature provides dial-up access to the system’s administration port, eit

Features and ServicesRemote Initialization and Maintenance Service (RIMS)DescriptionRemote Initialization and Maintenance Service (RIMS) provides an A

Remote Initialization and Maintenance Service (RIMS)2. If you have a special telephone line connected to your System 25 for Remote Administration,do o

Features and Services2-278bThis page intentionally left blank.November 1995

Repertory DialingRepertory DialingDescriptionThis feature allows multiline voice terminal users to store a telephone number, account code,or feature a

FEATURES AND SERVICESDisplay: When a call is placed by pressing a REP DIAL button, the characters stored aredisplayed. If ✶ was programmed to store

Send All CallsSend All CallsDescriptionThis feature allows multiline voice terminal including ATL cordless telephone users to turn offtheir ringers an

FEATURES AND SERVICESInteractionsThe following features interact with Send All Calls.Bridging of System Access Buttons:The principal station can be ad

Send All CallsHands-Free Answer on Intercom: Activating Send All Calls will cause an active AUTO ANSbutton to turn off. As long as the Send All Calls

FEATURES AND SERVICESFEATURES AND SERVICESIntroductionThis section describes the System Features, Station Features, Network Features, DataFeatures, an

FEATURES AND SERVICESSpeakerDescriptionSome 7300H-series voice terminals have a built-in loudspeaker that allows on-hook dialing,group listening, and

Speakerphone AdjunctSpeakerphone AdjunctDescriptionThe speakerphone adjunct permits users of voice terminals not equipped with built-inspeakerphones t

FEATURES AND SERVICESThe unit has a SPEAKERPHONE ON/OFF pushbutton switch and a MICROPHONE ON/OFFpushbutton switch.The former controls the entire unit

Speakerphone AdjunctVOLUMECONTROLSPEAKERPHONEON LAMP4A SPEAKERPHONE SYSTEMTRANSMITTERS101A/S102A SPEAKERPHONEFigure 2-41.Speakerphone Adjuncts2-287

FEATURES AND SERVICESSYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLEPART OF SIPC2SIPW1C1VOICEADAPT.B1TERMINALT1C8S102ASPEAKERPHONEPEC 3163-HFUL

Speakerphone AdjunctSYSTEM 25CABINETZTN79PART OFHYBRIDOCTOPUS CABLEPART OF SIPLINE CPC2SIPW1B1Z400FC1VOICEADAPT.ADAPT.TERMINALT1C7 C8PWR.S102ASUPPLYSP

FEATURES AND SERVICESSYSTEM 25CABINETPART OFTN735METLINE CPOCTOPUSCABLEPART OF SIP400B2C2SIPW1 B1C1MET SETADAPTADAPTT1C7C8LEGEND:248BADAPT2012DTRANSB1

Speed DialingSpeed DialingDescriptionThere are two types of Speed Dialing: (1) System Speed Dialing, andDialing.System Speed Dialing:Allows the System

FEATURES AND SERVICESPersonal Speed Dialing:Allows users to program up to twenty Personal Speed Dialing numbers (maximum of 25characters in length) th

Speed DialingData Terminal Dialing:System Speed Dialing codes can be entered during Data TerminalDialing. Personal Speed Dialing is not supported.Disp

FEATURES AND SERVICESSymbols Used in IllustrationsMany feature descriptions in this section contain illustrations of equipment and connections.In the

FEATURES AND SERVICESSTARLAN NETWORK AccessDescriptionThe AT&T STARLAN NETWORK (STARLAN NETWORK) Access feature providesconnectivity between Syste

STARLAN NETWORK AccessACCESS must be used in conjunction with the AT&T STARLAN NETWORK Serversoftware (Version 2.0 or later). Installation softw

FEATURES AND SERVICES3. After a connection message is received, CAM automatically switches to terminalemulation (data) mode.4.The user may now log in

STARLAN NETWORK AccessCalls from System 25 to the STARLAN NETWORKA.An MS-DOS PC connected to System 25 uses the STARLAN NETWORK ACCESSsoftware to run

FEATURES AND SERVICESThird-Party Call SetupA data terminal (on System 25) or workstation (on the STARLAN NETWORK) can set up acall between two other s

STARLAN NETWORK AccessCommon Administration (default):● CO trunk pool dial restriction (no)● Other trunk pool dial restriction (no)● Outward restrict

FEATURES AND SERVICESNAU -NETWORK ACCESS UNIT - PEC 2614-100NEU -NETWORK EXTENSION UNIT - PEC 261O-OO1ZTN84 -STARLAN CP - PEC 62518ZTN78 -TIP/RING LIN

STARLAN NETWORK AccessNAU - NETWORK ACCESS UNIT - PEC 2614-100NEU - NETWORK EXTENSION UNIT - PEC 2610-001ZTN79 - ATL LINE CP - PEC 62505ZTN84 - STARLA

FEATURES AND SERVICESStation HuntingDescriptionThis feature provides linear, circular, or combinational hunting sequences for calls to busysingle-line

Station HuntingConsiderationsStation Hunting provides several flexible alternatives to ensure that calls do not gounanswered. Note that only calls to

FEATURES AND SERVICESSystem FeaturesSystem features (Table 2-A) are those that affect the entire operation of the system.Table 2-A.System FeaturesFEAT

FEATURES AND SERVICESStation Message Detail Recording (SMDR)DescriptionThis feature provides detailed call information records on all incoming and out

Station Message Detail Recording (SMDR)The SMDR call detail (Figure 2-48) contains the following information for each call record:● TYPE (Column 1)Al

Features and Services● Blank (Column 46)● FAC (Columns 47-51 - Facility)Indicates the facility used to place the call. For outgoing calls including S

Station Message Detail Recording (SMDR)● Blank (Column 74)● PDC (Columns 75-78)Identifies the user responsible for outgoing calls. The user is identi

Features and ServicesRemote Access: Remote Access calls are fully covered in the SMDR call records. Failed remotecalls are shown in account field (se

Station Message Detail Recording (SMDR)CCCCCCCCCCCCCCCCCCCCCCCCDATE10/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/

Features and ServicesASCII CHARACTERPOSITION(Column Number)010203-040506-070809-101112-131415-161718-35363738-3940DESCRIPTION0-9:41-424344-45:4647-515

Station Message Detail Recording (SMDR)ASCII CHARACTERPOSITION0001-0304-0708-1213-1617-2324-293031-3637-3839-4142-4849-5152-5455-5758-6263-6970-7677-7

FEATURES AND SERVICESSYSTEM 25 PART OFCABINET OCTOPUSCABLESIPPART OFZTN130C2Z210AC1>355A/AFSMDR OUTPUTCPU/MEM ADAPT.ADAPT.DEVICELEGEND:C1 -C2 -355A

Station Message Detail Recording (SMDR)SYSTEM 25 PART OFCABINETOCTOPUSCABLEPART OFSIPZTN130C2Z21OAC1355AFC3Z3A4C1CPU/MEMADAPT. ADAPT.ADUC4PART OF SIPS

FEATURES AND SERVICESStation FeaturesThe many Station Features (Table 2-B) available allow individual user needs to be met. Asthese needs change, assi

Features and ServicesLEGEND:B1 –C1 –C2 –W1 –Z3A1 ADU –C3 –355AF ADAPTER –Z3A4 ADU –C1 –C7 –248B ADAPTER –400B2 ADAPTER –2012D TRANSFORMER –* MAY NEED

Station Message Detail Recording (SMDR)This figure no longer applicable.Figure 54. SMDR Output Equipment-Off-Premises Direct ConnectionsNovember 19952

Features and ServicesLEGEND:C2 –OPS –C3 –355AF ADAPTER –Z3A4 ADU –C1 –C7 –248B ADAPTER –400B2 ADAPTER –2012D TRANSFORMER –OCTOPUS CABLE (WP90780) - PE

Station-to-Station Message WaitingStation-to-Station Message WaitingDescriptionThis feature allows pairs of multiline voice terminal users to signal e

FEATURES AND SERVICESSystem AdministrationDescriptionThe software that controls System 25 operation consists of tables located in system memory.These

System AdministrationA main menu gives the user ready access for these tasks:— Adding/changing/removing voice station assignments— Adding/removing use

FEATURES AND SERVICESThe Model 703 keyboard generates ASCII codes.The terminal produces two audible tonesto indicate the completion of activities.● Sh

System AdministrationA-Z or a-z0-9✶ , #.?BACKSPACERETURN"The data transfer rate is set when a carriage return character is received by theadminis

FEATURES AND SERVICESFigure 2-56.Model 703 System Administration Terminal2-322

System AdministrationPART OFSYSTEM 25OCTOPUSCABINETCABLEPART OFSIPZTN130/C2Z210A C1SYSTEMZTN142ADAPT.355A/AFADMINISTRATIONCPU/MEMTERMINALLEGEND:C1– MO

FEATURES AND SERVICESTable 2-B.Station Features (Contd)FEATURE NAMESINGLE-LINEMULTILINE TERMINALFEATUREATL CORDLESSTERMINALBUTTON LABEL TYPETELEPHONEP

Features and ServicesLEGEND:B1 –C1 –C2 –W1 –Z3A1 ADU –C3 –C4 –355AF ADAPTER –Z3A4 ADU –C1 –C7 –248B ADAPTER –400B2 ADAPTER –2012D TRANSFORMER –TYPICAL

System AdministrationLEGEND:B1 –C1 –C2 –W1 –Z3A1 ADU –C3 –355AF ADAPTER –Z3A4 ADU –C1 –C7 –248B ADAPTER –400B2 ADAPTER –2012D TRANSFORMER –* MAY NEED

Features and ServicesLEGEND:C1 –C2 –C3 –355AF ADAPTER –MODULAR CORD (D8W-87) - PEC 2725-07GOCTOPUS CABLE (WP90780) - PEC 2720-05PEIA CROSSOVER CABLE (

System AdministrationLEGEND:C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05POPS - OFF-PREMISES STATIONC3 - EIA CROSSOVER CABLE (M7U-87)355AF ADAPTER - RS-2

FEATURES AND SERVICESSystem MaintenanceDescriptionThe primary objective of System 25 maintenance is to detect, report, and clear troubles asquickly as

System MaintenanceIf an error that begins as a Transient System Error is verified or reaches a thresholdlevel of severity, it is reclassified as a Per

FEATURES AND SERVICESTandem TrunkingDescriptionTandem trunking provides an enhanced networking capability for System 25. With thisfeature, tie trunks

Tandem TrunkingTo gain access to an ARS routing facility, the tandem trunk’s “station” FRL must be equal toor greater than the route’s FRL. Thus, a ta

FEATURES AND SERVICESTestDescriptionThis feature provides users of the 7300H series voice terminals the ability to test theirterminals.Placing the Tes

Third-Party Call SetupThird-Party Call SetupDescriptionThe Third-Party Call Setup feature allows a data terminal (the third party) to set up, viaCom

FEATURES AND SERVICESData FeaturesData Features (Table 2-D) support the switched data services of the system. Data servicesprovide switched connection

FEATURES AND SERVICESexample, if the source terminal is restricted to on-premises calls only, a call to an off-premises destination terminal will b

Third-Party Call SetupConsiderationsWith this feature, computer-based telemarketing or other calling applications can set up callsfor the user.Interac

FEATURES AND SERVICES—No source terminals (feature disabled; default)● AT&T STARLAN NETWORK Access:Ports administered on the STARLAN INTERFACE cir

Tie TrunksTie TrunksDescriptionTie trunks provideIncoming tie trunkendpoint. Serviceprivatecommunications links between System 25 and other PBXScalls

FEATURES AND SERVICESAdministration RequirementsTrunk Port:●●●●●●●●Assign Trunk Type And Number.Assign Class Of Service Code (0-15).Assign Facility Ac

Tie TrunksHardware RequirementsRequires port interfaces on a TN760B Tie Trunk CP or TN767 DS1 Interface CP.2-339

FEATURES AND SERVICESTouch-Tone and Dial Pulse ServicesDescriptionAll touch-tone single-line voice terminals and MET sets are equipped with dial pads

TransferTransferDescriptionThis feature allows a user to move any call from the user’s terminal to another voiceterminal, then disconnect from the cal

FEATURES AND SERVICESBridging of System Access Buttons:A call can be transferred from a bridged callappearance using the usual transfer operations.Whe

TransferMusic-On-Hold: An administration item allows Music-On-Hold to be enabled or disabled for“Special Hold.”Park: Single line voice terminals cann

FEATURES AND SERVICESAttendant FeaturesAttendant Features (Table 2-E) are available to the attendant using the Direct TrunkAttendant Console (DTAC) or

Features and ServicesTransfer To DataDescriptionThis feature allows multiline voice terminal users to originate or answer a call from their voicetermi

Transfer To DataData Call PreindicationA multiline voice terminal user, by going off-hook and pressing an idle DATA button, mayindicate that a data ca

FEATURES AND SERVICESTrunk GroupsDescriptionThis feature allows each trunk in the system to be assigned to one of up to 16 trunk groups.Trunks link tw

Trunk Groups● Wink Start—A momentary signal (wink) is senttrunks).● Delay Dial—A steady signal is sent to the distantto receive digits (Tie trunks onl

FEATURES AND SERVICESFacility Access Restriction (see “Calling Restrictions”): Stations may be restricted fromdialing the CO trunk pool and/or all (fi

Trunk-To-Trunk TransferTrunk-To-Trunk TransferDescriptionThis feature allows users to connect incoming trunk calls to other outside trunks and thenhan

FEATURES AND SERVICESUser Changeable OptionsDescriptionUser Changeable Options allows a data terminal user who is in the Command Mode to viewand chang

User Changeable Options2-351

FEATURES AND SERVICESViewing OptionsWhen <View options> is selected, current and default values for the various data portoptions are displayed

User Changeable OptionsOnce a user has selected an option to be changed, a menu of valid settings for this option isdisplayed (<Yes>, <No>

FEATURES AND SERVICESAccount Code Entry, ForcedDescriptionThis feature forces selected station users to enter account codes before dialing certain cal

FEATURES AND SERVICES● If the user selects<View options>, the following menu is displayed:OPTIONSCURRENTREQUESTEDSpeed (highest)96004800 (Auto)

User Changeable OptionsAdministration Requirements● Data Port:A data port must be administered to allow the terminal user to change options fromthe Co

FEATURES AND SERVICESVirtual FacilitiesDescriptionA virtual facility (VF) is a call routing facility that is not defined by the physical facility (tru

Virtual FacilitiesIf the VF is used in the first position of a routing pattern, calls may queue on it if all of theroutes are busy.Whenever a VF is us

FEATURES AND SERVICES—The “9” is used to access the remote PBX’s ARS.—The “ ✶ ” represents a pause of 1.5 seconds (allows time for dial tone tooccur)

Virtual FacilitiesAccessing a Virtual FacilityDial access is provided by dialing the VF code (#190-#199, including the “#”), followed bythe destinatio

FEATURES AND SERVICESInteractionsWhen using a VF through dial access, calling restrictions will be based on the station’s classof service. Dial access

AUDIX Voice Power SystemAUDIX Voice Power SystemDescriptionThe AT&T AUDIX VOICE POWER (AVP) System provides a group of communications servicesthat

Features and ServicesChoosing PasswordsPasswords should be as many digits as possible, and should not be obvious. Avoid those withascending digits (e.

FUNCTIONAL DESCRIPTIONDigital Switch Common ControlCPU/MEM CPSwitching NetworkTDM BusPort CircuitsCircuitry Common to All Port CPsAnalog Line (TN742)A

REPAIR INSTRUCTIONSIf you experience trouble with this telephone equipment, contact the AT&T National Service Centeron 1-800-628-8888. The Telepho

Account Code Entry, ForcedThe system does not check the validity of account codes. It checks only for the propernumber of digits or the code terminato

MemoryCall ProcessingTDM BUSPort Circuit PacksStep-By-Step Call Description3-413-413-423-423-42-ii-

FiguresFigure 3-1.Figure 3-2.Figure 3-3.Figure 3-4.Figure 3-5.Figure 3-6.Figure 3-7.Figure 3-8.Figure 3-9.Figure 3-10.Figure 3-11.Figure 3-12.Figure 3

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONThis section describes how the digital switch and the software of System 25 provide control andswitching.D

FUNCTIONAL DESCRIPTIONCommon ControlThe Common Control circuitry consists of a single ZTN142 CPU/MEM (Call ProcessingUnit/Memory) circuit pack (CP).CP

FUNCTIONAL DESCRIPTIONFigure 3-2. CPU/MEM (ZTN142) CircuitryNovember 19953-3

FUNCTIONAL DESCRIPTIONAll uplink messages from the port circuits are checked for consistency and passed to theCommon Control. The controller is the di

FUNCTIONAL DESCRIPTION● Emergency Transfer Unit (ETU) ControlRemoves -48 V dc power from the ETUs of the system when the system loses poweror a major

FUNCTIONAL DESCRIPTIONSwitching NetworkSystem 25 uses distributed processing techniques to provide switched voiceservices.The switch operates at 64 Kb

FUNCTIONAL DESCRIPTION●●Physical CharacteristicsThe TDM bus is an 8-bit bus that snakes continuously between cabinets in amulticabinet system as shown

FUNCTIONAL DESCRIPTIONTDMBUSTERMINATORCARDTDM BUSEXTENDERCABLE(CBC)AC POWERTO SINGLEPOINT GROUNDCABINETON/OFFSWITCH3AC POWER# 6 AWGBUILDINGGROUNDWIREC

FEATURES AND SERVICESRemote Access: Remote access callers cannot enter account codes.Third-Party Call Setup: If the source station is FACE-restricte

FUNCTIONAL DESCRIPTIONPort CircuitsThe port circuit packs listed below provide the link between trunks and external equipment and theTDM bus. Figure 3

FUNCTIONAL DESCRIPTIONDATA TERMINALEQUIPMENT,RS-232CHOST C0MPUTERSINGLE-LINEVOICE TERMINALZ3A1/2/4ADU(2500-SERIES7101A OR 7102A)DATA TERMINALEQUIPMENT

FUNCTIONAL DESCRIPTIONSAT, DTU, SMDR,CAS (ON-PREMISES)(DIRECT CONNECTION)Z3A1ADU*Z3A4ADU** REQUIRED FOR CONNECTIONS >50 FEETOR NOT SHARING SAME AC

FUNCTIONAL DESCRIPTIONSINGLE-LINE VOICE TERMINALS(42, 500, 2500-SERIES, 7101A,7102A)——————————RECORDED ANNOUNCEMENTS——————————DICTATION EQUIPMENT—————

FUNCTIONAL DESCRIPTIONThe SAKI also does the following functions:———————Identifies the circuit pack to the Common Control (location and vintage)Contro

FUNCTIONAL DESCRIPTION● NPE (Network Processing Element)Each port circuit pack contains one or two NPEs. The Analog Line, ATL Line, TipRing, Data Line

FUNCTIONAL DESCRIPTIONFigure 3-7. Analog Line (TN742) Unique Circuitry● Port CircuitsThe eight port circuits are identical. Each port circuit consists

FUNCTIONAL DESCRIPTIONThe electronic battery feed circuit provides talking battery to the voice terminal. It alsoproduces a controlled dc battery feed

FUNCTIONAL DESCRIPTIONTOMULTILINEVOICETERMINALSANDATLCORDEDANDCORDLESSTELEPHONESFigure 3-8.ATL Line (ZTN79) Unique Circuitry3-17

FUNCTIONAL DESCRIPTIONAuxiliary Trunk (TN763)The Auxiliary Trunk Circuit Pack (Figure 3-9) interfaces four ports provided for customer-provided equipm

Account Code Entry, OptionalAccount Code Entry,DescriptionOptional Account Code Entryincoming and outgoing calls.Optionalallows voice terminal users t

FUNCTIONAL DESCRIPTIONON-BOARDMICROPROCESSORTOAUXILIARYEQUIPMENTFigure 3-9.Auxiliary Trunk (TN763) Unique CircuitryData Line (TN726)The Data Line Circ

FUNCTIONAL DESCRIPTIONFigure 3-10.Data Line (TN726) Unique Circuitry3-20

FUNCTIONAL DESCRIPTION● Port CircuitsEach of the eight identical port circuits allows the connection of interface equipmenthaving an RS-232 compatible

FUNCTIONAL DESCRIPTIONNPE 0NPE 1ON-BOARDMICROPROCESSORFigure 3-11.DID Trunk (TN753) Unique CircuitryGround Start Trunk (ZTN76jTOCENTRALOFFICEThe Groun

FUNCTIONAL DESCRIPTIONNPE 0NPE 1ON-BOARDMICROPROCESSORTOCENTRALOFFICEFigure 3-12.Ground Start Trunk (ZTN76) Unique Circuitry● Port I/O CircuitThis cir

FUNCTIONAL DESCRIPTIONLoop Start Trunk (ZTN77)The Loop Start Trunk Circuit Pack interfaces eight central office loop start trunks and theTDM bus. Figu

FUNCTIONAL DESCRIPTIONoperates the appropriate relay.The relays control circuitry provides the propersignaling for loop start trunks. The trunks suppo

FUNCTIONAL DESCRIPTIONswitchhook information is also sent over these channels.The electronic power feed device provides phantomed -48 volt dc power fo

FUNCTIONAL DESCRIPTIONTie Trunk (TN760B)The Tie Trunk Circuit Pack (Figure 3-15) interfaces four 6-wire tie trunks and the TDM bus.Two tip and ring pa

FUNCTIONAL DESCRIPTIONThe signaling type is administrable for each port. Table 3-B summarizes theconditions present as the transmit and receive contro

FEATURES AND SERVICESErroneous account codes that are not corrected before the last digit is entered are recordedand cannot be changed. Partial accoun

FUNCTIONAL DESCRIPTIONTable 3-B.Signaling Type SummarySignaling TransmitReceiveTypeOn-HookOff-HookOn-HookOff-HookI Std.grdbatopen/bat (*)grdI Compat.o

FUNCTIONAL DESCRIPTIONTip Ring Line (ZTN78)The Tip Ring Line Circuit Pack interfaces eight analog tip and ring voice terminal lines(single-line voice

FUNCTIONAL DESCRIPTION● Port I/O CircuitThis circuit includes bus expanders connecting the on-board microprocessor and theport circuits.It receives co

FUNCTIONAL DESCRIPTION●●Bus BuffersThere are four bus buffers on the circuit pack. The clock driver and receive buffersinterface three system clock si

FUNCTIONAL DESCRIPTION● On-Board Microprocessor With External RAMThis circuit functions the same as the microprocessor in the common circuitry for the

FUNCTIONAL DESCRIPTION●Port I/O and Sanity Check CircuitThis circuit interfaces the on-board microprocessor to the port circuits and checksthe sanity

FUNCTIONAL DESCRIPTION● Port CircuitsThere are eight port circuits.Six port circuits are connected to Network ProcessingElements (NPEs). Port circuits

FUNCTIONAL DESCRIPTIONTDMBUSLEADSCIRCUITPACKADDRESSLEADSFigure 3-20. Pooled Modem (TN758)● Common CircuitryThe Pooled Modem contains the same common c

FUNCTIONAL DESCRIPTIONinformation.It also allows the port circuit microprocessor to inform the on-boardmicroprocessor of various port circuit status i

FUNCTIONAL DESCRIPTIONSoftwareThe System software consists of switched services,administrative, and maintenancesoftware. This software runs on top of

Account Code Entry, OptionalAdministration RequirementsSystem:● Assign number of Account Code digits (0-15; default = 15).Voice Terminal Port:● Multil

FUNCTIONAL DESCRIPTIONMemory AllocationThe system software, like the hardware, is identified by release and version number. Eachversion identifies a p

FUNCTIONAL DESCRIPTIONFigure 3-21.System Software Partitioning3-40

FUNCTIONAL DESCRIPTIONMemoryAdministration and Feature Code Modules, which includes Station Call Processing, aresoftware tasks associated with memory.

FUNCTIONAL DESCRIPTION● Operating System (OS)Controls all message and data flow to/from memory, to the Arch Angel DriverInterface, to the microprocess

FUNCTIONAL DESCRIPTION5.6.7.8.9.10.11.12.13.14.15.16.17.The OS checks a message directory to determine which task (i.e., software module)is to receive

FUNCTIONAL DESCRIPTION18. When either of the parties hangs up, the associated port circuit controller sends anup-link message to the Station Call Proc

HARDWARE DESCRIPTIONSystem Cabinets (J58901A1 L4)Cabinet 1 (Control and Port Circuits)Cabinets 2 and 3 (Port Circuits)Cabinet Address Plug4-14-44-44-6

7313H01A Voice Terminal (BIS-10) (PEC 3165-10B) 4-387314H01A Voice Terminal (BIS-22) (PEC 3166-22B) 4-40731

ADU Connections 4-68Auxiliary Equipment Connections 4-68-iii-

FiguresFigure 4-1.Figure 4-2.Figure 4-3.Figure 4-4.Figure 4-5.Figure 4-6.Figure 4-7.Figure 4-8.Figure 4-9.Figure 4-10.Figure 4-11.Figure 4-12.Figure 4

FEATURES AND SERVICESAttendant Call ExtendingDescriptionThis feature allows the attendant to put a call in a special hold condition, call another stat

Figure 4-31. Out-of-Building 7300H Series Multiline Voice Terminal Connections -4-72Figure 4-32. MET Set Connections

HARDWARE DESCRIPTIONHARDWARE DESCRIPTIONThis Section provides descriptions of System 25 hardware components and their functions.The hardware is covere

HARDWARE DESCRIPTIONThe cabinets have a brown front cover with beige top and sides. The front cover has asystem identification stripe across the top.T

HARDWARE DESCRIPTION———CABINET 3(12 PORT CIRCUIT PACKS)CABINET 2(12 PORT CIRCUIT PACKS)CABINET 1(CONTROL AND SERVICECIRCUITS; 10 PORTCIRCUIT PACKS)Fig

HARDWARE DESCRIPTIONCAUTION & WARNINGGROUNDINGLABELSFCC LABEL BLOCKSYSTEM 25VOLTS ACJ58901AAMPSHZ25-PAIRCONNECTORSINPUTON/OFFAC POWER SWITCHRECEPT

HARDWARE DESCRIPTIONPOWER SUPPLY1234 5678 910 1112PORT CIRCUITSPOWER SUPPLYCIRCUIT PACK SLOTSCPU/MEMSERVICE CIRCUITCABINET 1—MOUNTING FOR CONTROL &

HARDWARE DESCRIPTIONCabinet Address PlugAn address plug is provided on the middle of the backplane of each cabinet (accessible afterremoving the top r

HARDWARE DESCRIPTIONCircuit PacksThis part describes required and optional System 25 Circuit Packs (CPs) and their compatibility andfeatures. Required

HARDWARE DESCRIPTIONRequired Circuit PacksThe following CPs are provided with all Release 3 systems and must be mounted in Cabinet 1:● ZTN142 CPU/MEM

HARDWARE DESCRIPTIONOptional Circuit PacksThe following CPS are optional and can be mounted in any slot not occupied by the required CPS.Station Port

Attendant Call ExtendingCalls extended to an idle voice terminal that are not answered within a specified time returnto the Attendant Console on an id

HARDWARE DESCRIPTIONProvides eight ports for MERLIN® Communications System voice terminals and ATLcordless telephones. Used for service within 2000 fe

HARDWARE DESCRIPTIONTrunk Port Circuit Packs● TN753 DID TrunkProvides eight ports for immediate-start or wink-start Direct Inward Dialing (DID)trunks.

HARDWARE DESCRIPTIONSystem Resource Circuit Packs● TN748B and TN748C Tone DetectorProvides four touch-tone receivers; the system can have a maximum

HARDWARE DESCRIPTIONCircuit Pack CompatibilityThe following System 75 CPs can be used in System 25, if required:● The TN742 and TN746B Analog Line cir

HARDWARE DESCRIPTION— CPU/MEM CP: Green status LED only. “Off” for several seconds during power up andtest, then lamp flashes to indicate an “OK” stat

HARDWARE DESCRIPTIONTable 4-D.Summary of Voice TerminalsTERMINALCIRCUIT PACKTYPE *MODELDESCRIPTIONINTERFACE420Memory Set with Built-in Speakerphone500

HARDWARE DESCRIPTIONSingle-Line Voice TerminalsSingle-line terminals can have only one incoming call ringing when the terminal is idle. Theuser at any

HARDWARE DESCRIPTION● Model 2500MMGB—Basic desk set (PEC 3100-1TD)● Model 2500MMGT—Basic desk set with Recall button (PEC 3100-TRC)● Model 2500SM—Basi

HARDWARE DESCRIPTIONTable 4-E.2500 Series Voice Terminal AdjunctsADJUNCT 2500DMGC 2500MMGB 2500SM 2514BMW 2554BM4A SpeakerphoneXKS 23566,L1 GroundX X

HARDWARE DESCRIPTION2526BMWG Voice TerminalThis analog terminal (Figure 4-5) consists of a standard touch-tone wall set equipped with aspecial facepla

FEATURES AND SERVICESAttendant Camp-OnDescriptionThis feature allows the attendant to extend a trunk call to a busy voice terminal and leave itwaiting

HARDWARE DESCRIPTION7101A Voice Terminal (MD) (PEC 3170-00M)The Model 7101A single-line analog voice terminal (Figure 4-6) is about 2-3/4 inches wide,

HARDWARE DESCRIPTION420 Speakerphone Voice Terminal (Not Orderable)The 420 Speakerphone voice terminal (Figure 4-7) is a single-line analog set that c

HARDWARE DESCRIPTIONMEMORYBUTTONSPROGRAM BUTTONFLASH BUTTONHOLD BUTTON AND LAMPSPEAKERPHONE BUTTONAND LAMPMUTE BUTTONRINGERVOLUMESPEAKERCONTROLVOLUMEC

HARDWARE DESCRIPTIONMultiline Voice TerminalsThe recommended multiline terminals for System 25 is the ATL cordless telephone and the7300H Series hybri

HARDWARE DESCRIPTION7302H01D Voice Terminal (5-Button) (PEC 3160-111)The 7302H01D voice terminal (Figure 4-8) can be desk or wall mounted and is about

HARDWARE DESCRIPTIONHANDSETPROGRAMMABLETEST/PROGRAMBUTTONS (5)SWITCHWITH I-USE AND(ON SIDE)STATUS LEDsSPEAKER/RINGVOLUME CONTROL(ON SIDE)Figure 4-8.73

HARDWARE DESCRIPTION7303H01D Voice Terminal (10-Button) PEC 3161-172The 7303H01D voice terminal (Figure 4-9) can be desk or wall mounted and is about

HARDWARE DESCRIPTIONPROGRAMMABLEBUTTONS (10)TEST/PROGRAMSWITCHWITH I-USESTATUS LEDs(ON SIDE)HANDSETTOUCH DIAL PADSPEAKER/RINGVOLUME CONTROL(ON SIDE)ME

HARDWARE DESCRIPTION7305H01D Voice Terminal (34-Button) (MD) (PEC 3162-412)The 7305H01D voice terminal (Figure 4-10) can be desk or wall mounted and

HARDWARE DESCRIPTIONI-USE/STATUS LEDsPROGRAMMABLEHANDSETBUTTONS (34)Figure 4-10.7305H01D Voice Terminal (34-Button) (MD)4-29

Attendant Camp-OnDirect Group Calling: The attendant can camp-on more than one call per DGC group. Voiceterminals in the group do not receive a burst

HARDWARE DESCRIPTION7305H02D Voice Terminal (34-Button Deluxe) (PEC 3162-417)The 7305H02D voice terminal (Figure 4-11) is available for general use an

HARDWARE DESCRIPTION† On the first Attendant Console, the first of the Direct Facility (Pooled)Access buttons defaults to loop-start trunks, the secon

HARDWARE DESCRIPTION7305H03B Voice Terminal (BIS) (PEC 3162-BIS)The 7305H03B voice terminal (Figure 4-12) is available for general use and as a Direct

HARDWARE DESCRIPTIONNumber Dialed (1).** On the first Attendant Console, the first 15 trunks in the system areassigned button appearances on the conso

HARDWARE DESCRIPTION7305H04C Voice Terminal (BIS With Display) (PEC 3162-DIS)The 7305H04C voice terminal (Figure 4-13) is available for general use an

HARDWARE DESCRIPTION— Twelve others predefined as Inspect, Attendant Message Waiting, Alarm,Local, Scroll, Forced Release, Start, Source, Release, Des

HARDWARE DESCRIPTION7309H01B Voice Terminal (HFAI) (PEC 3161-161)The 7309H01B voice terminal (Figure 4-14) can be desk or wall mounted. It is about 6-

HARDWARE DESCRIPTIONFigure4-14. 7309H01B Voice Terminal (HFAI)4-37

HARDWARE DESCRIPTION7313H01A Voice Terminal (BIS-10) (PEC 3165-10B)This 7313H01A 10-button terminal (Figure 4-15) can be desk or wall mounted. It is a

HARDWARE DESCRIPTIONFigure 4-15.7313H01A Voice Terminal (BIS-10)4-39

FEATURES AND SERVICESAttendant CancelDescriptionThis feature allows the attendant to terminate an attempt to extend any incoming call if thecalled sta

HARDWARE DESCRIPTION7314H01A Voice Terminal (BIS-22) (PEC 3166-22B)The 7314H01A 22-button voice terminal (Figure 4-16) can be desk or wall mounted. It

HARDWARE DESCRIPTIONFigure 4-16.7314H01A Voice Terminal (BIS-22)4-41

HARDWARE DESCRIPTION7316H01A Voice Terminal (BIS-34) (PEC 3167-34B)The 7316H01A 34-button voice terminal (Figure 4-17) is available for general use or

HARDWARE DESCRIPTION** On the first Attendant Console, the first 15 trunks in the system areassigned button appearances on the console. If there are f

HARDWARE DESCRIPTION7317H01A Voice Terminal (BlS-34D) (PEC 3167-DSB)The 7317H01A 34-button voice terminal with display (Figure 4-18) is available for

HARDWARE DESCRIPTION— Twelve others predefined as Alarm, Source, Destination, Inspect, Local,Cancel, Start, Scroll, Forced Release, Attendant Message

HARDWARE DESCRIPTION10-Button MET Set (2991C/D05)The 10-Button MET set (Figure 4-19) may be desk or wall mounted. This set is available onlyon a reus

HARDWARE DESCRIPTIONFigure 4-19. 10-Button MET Set (2991C05)4-47

HARDWARE DESCRIPTION10-Button MET Set With Built-In Speakerphone (2993C04)The 10-Button MET set with BIS (Figure 4-20) can be desk or wall mounted. T

HARDWARE DESCRIPTIONFigure 4-20.10-Button MET With Built-In Speakerphone (2993C04)4-49

FCC WARNING STATEMENTFederal Communications Commission (FCC) Rules require that you be notified of the following:● This equipment generates, uses, and

Attendant Console, Direct TrunkCONSOLEAttendant Console, Direct TrunkDescriptionIn System 25, the Attendant Console is used to answer incoming trunk c

HARDWARE DESCRIPTION12-Button MET Set (7203M)The 12-Button MET set (Figure 4-21) is a freestanding voice terminal. This set is availableonly on a reu

HARDWARE DESCRIPTIONFigure 4-21. 12-ButtonMET Set (7203M)4-51

HARDWARE DESCRIPTIONATL Cordless Telephone (5-Button) (PEC 3168MLC)The ATL Cordless Telephone (Figure 4-22) consists of a handset plus a base. The tel

HARDWARE DESCRIPTION● Tone ringer and volume control● Security controls, antenna, handset battery charger.Adjuncts: NoneLINEAPPEARANCEWITH I-USEAND ST

HARDWARE DESCRIPTIONMultiline Voice Terminal Connection InformationDetailed connection information is provided under the “Connectivity” heading later

HARDWARE DESCRIPTIONVoice Terminal AdjunctsThe following adjuncts and associated power supplies are supported on corded multiline setsonly:● MET Heads

HARDWARE DESCRIPTIONVoice Terminal Adjunct Power SuppliesTable 4-F provides a summary of the supplemental power supplies and their applications.Table

HARDWARE DESCRIPTIONAsynchronous Data Units (ADUs)Asynchronous Data Units and Multiple Asynchronous Data Units (MADUs) provide aninterface between por

HARDWARE DESCRIPTION●An analog single-line voice terminal (2500 or 7100 series) or a 7300H series multilinevoice terminal (Z3A5 ADU required) can be c

HARDWARE DESCRIPTIONTable 4-G.Asynchronous Data UnitsUNIT PECFEATUREZ3A1 2169-0013-foot plug-ended EIA connector and mod jackfor single-line set.Z3A2

Attendant Console, Direct Trunk● Start [START]: Initiates the call-extending process by placing a caller on hold andproviding internal dial tone to t

HARDWARE DESCRIPTIONPeripheral EquipmentPeripheral Equipment includes the following devices that connect to the call processingportion of the CPU/MEM

HARDWARE DESCRIPTIONOptional Power EquipmentIn addition to the power supplies already mentioned, the following equipment can be usedwith System 25.Uni

HARDWARE DESCRIPTIONConnectivitySystem 25 requires 4-pair building wiring that conforms to AT&T Premises DistributionSystem (PDS) specifications.V

HARDWARE DESCRIPTIONLEGEND:A -B -C -OPS -SIP -D -E -F -* -SINGLE-ENDED 25-PAIR CONNECTOR CABLE (A25D)*3 TO 1 SPLITTER CONNECTORIZED CABLE - PEC 2720-0

HARDWARE DESCRIPTIONStation Interconnect Panel (SIP)The Station Interconnect Panel (SIP) provides for the connection of the terminals (voice anddata),

HARDWARE DESCRIPTIONFigure 4-25. 617A Panel4-65

HARDWARE DESCRIPTIONFigure 4-26 shows voice terminal connections to the system cabinets via the SIP. Typically,voice terminals are plugged into modula

HARDWARE DESCRIPTIONConnectivity FiguresFigures 4-27 through 4-37 provide connection information for various equipment. Thesefigures have been include

HARDWARE DESCRIPTIONADU ConnectionsFigures 4-34 and 4-35 provide connection information for data terminals and associatedsingle-line or multiline voic

HARDWARE DESCRIPTIONSYSTEM 25PART OFCABINETOCTOPUSCABLEPART OFSIPTN742C2ANALOGSIPW1D1LINE CPADAPT.EXPOSEDCABLED1W1SINGLE-LINEVOICETERMINAL(NOTE)C5B1LE

Attendant Console, Direct TrunkPosition BusyA POS BUSY button can be assigned to each console; this permits selection of one of twomodes of operation:

HARDWARE DESCRIPTIONPART OF TAESYSTEM 25PART OF700A NETWORKCABINETOCTOPUSINTERFACE BLOCKCABLE(110- OR 66-TYPE)PART OFNETWORKSIPINTERFACETN742C2SIPW1AA

HARDWARE DESCRIPTIONSYSTEM 25PART OFCABINETOCTOPUSCABLEPART OFSIPZTN79C2SIPW1VOICEATLB1C1ADAPT.TERMINALLINE CPT1LEGEND:B1- TYPICAL-103A CONNECTING BLO

HARDWARE DESCRIPTIONSYSTEM 25CABINETZTN79ATLLINE CPPART OFEXPOSEDOCTOPUS CABLECABLEPART OF SIPIROBIROBC2SIPC1PROTECTIONPROTECTIONTII 341TII 341ADAPT.(

HARDWARE DESCRIPTIONSYSTEM 25CABINETPART OFOCTOPUSCABLEPART OF SIPTN735METC2SIPW1 B1400B2C1/C9METLINE CPADAPT.ADAPT.SETC7248BADAPT.(NOTE)2012DTRANS.LE

HARDWARE DESCRIPTIONSYSTEM 25PART OFCABINETOCTOPUSCABLE PART OFSIPZTN79C2451A Z400FC1SIPHYBRIDADAPT.LINE CPADAPT.ADAPT.C7W1MBPSP2(NOTE)7300HSERIESVOIC

HARDWARE DESCRIPTIONSYSTEM 25PART OFCABINETOCTOPUSCABLEPART OF SIPZTN78C2ORTN742Y ADAPT.(WP90851-L1)TN726C2LEGEND:ZTN78 -TN742 -TN726 -B1 -C1 -C2 -C5

HARDWARE DESCRIPTIONSYSTEM 25PART OFCABINETOCTOPUSCABLEPART OF SIPZTN79C2ATLLINE CPY ADAPTSIP(WP90851-L1)ADAPT.TN726DATAC2LINE CPW1C1B1Z3A5ADU-48V DCC

HARDWARE DESCRIPTIONSYSTEM 25CABINETTN726HOSTCOMPUTERORTERMINALSLEGEND:TN726 - DATA LINE CPMADU - MULTIPLE ASYNCHRONOUS DATA UNIT (PEC 2169-005)SINGLE

HARDWARE DESCRIPTIOND8AM-87 CROSSOVER CORD(REQUIRED IF THIS ADU IS CONNECTEDTO ANOTHER ADU OR ANY OTHER DCE DEVICE, RATHER THAN DATA LINE CP)NOTE:PEC

TECHNICAL SPECIFICATIONSHardware and Software Parameters 5-2Unit Loads

FEATURES AND SERVICESAdministration RequirementsSystem:● Display attendant position number (first or second).● Assign number of rings before unanswere

FiguresFigure 5-1. Single-Line Voice Terminal Allowable Cable Distances 5-7Figure 5-2.Multiline Voice Terminal Allowable Cable Dis

TECHNICAL SPECIFICATIONSTECHNICAL SPECIFICATIONSThis section provides information on the technical characteristics and capacities of thesystem. Some i

TECHNICAL SPECIFICATIONSHardware and Software ParametersThe following is a listing of maximums for hardware and software parameters.ITEMTOTALAttendant

TECHNICAL SPECIFICATIONSHardware and Software Parameters (Contd)ITEMTOTALEmergency Transfer Units (ETUs)4Voice Terminals per ETU5Modem Pool Circuit Pa

TECHNICAL SPECIFICATIONSHardware and Software Parameters (Contd)ITEMTOTALSystem Administration Terminal1Toll Call Allowed Lists4Total Entries (all lis

TECHNICAL SPECIFICATIONSHardware and Software Parameters (Contd)ITEMTOTALTrunks● Trunk Ports104— Tie Trunks104● Auxiliary Trunk Ports— Paging Access

TECHNICAL SPECIFICATIONSUnit LoadsA cabinet can supply no more than 80 unit loads of 48 volt power (a unit load is defined as 44 mA).Unit loading is d

TECHNICAL SPECIFICATIONSCable Distance LimitationsThis subsection provides allowable cabling distances for the following devices:● Single-Line Voice T

TECHNICAL SPECIFICATIONSMultiline Voice TerminalsSUPPORTING24-GAUGE WIRECIRCUIT (0.5106 mm)PACKFEETMETERSZTN79(7300H Series—in-building 2,000610and AT

TECHNICAL SPECIFICATIONSData Terminals (RS-232) Connected To Asynchronous Data UnitsDATA RATE24-GAUGE WIRE(0.5106 mm)FEET METERS300 bps40,00012,2001,2

Attendant Console, Direct TrunkSYSTEM 25CABINETPART OFOCTOPUS CABLEZTN79HYBRIDLINE CPPART OF SIPC2 SIPW1C1DIRECT TRUNKADAPT.B1ATTENDANTCONSOLE T1LEGEN

TECHNICAL SPECIFICATIONSCall Progress TonesThe following call progress tones are generated by the system:TONEBusyCall Waiting NotifyConfirmationDequeu

TECHNICAL SPECIFICATIONSIndicator Lamp SignalsThe following lamp signals are provided at multiline voice terminal and ATLtelephone line appearances:co

TECHNICAL SPECIFICATIONSPort SpecificationsThe following tables provide interface specifications for System 25 line and trunk portcircuits:DATA TERMIN

TECHNICAL SPECIFICATIONSPort Specifications (Contd)DATA TERMINALS(Do Not Require Local Power)DATAREQUIRES Z3A1 REQUIRESTERMINAL or Z3A2 ADU Z3A4 ADUAT

TECHNICAL SPECIFICATIONSPort Specifications (Contd)5-14VOICE TERMINAL PORTSSTATION TYPECIRCUIT PACKSPECIFICATIONSTip and RingTip Ring LineSingle-Line(

TECHNICAL SPECIFICATIONSPort Specifications (Contd)VOICE TERMINAL PORTS (Contd)STATION TYPECIRCUIT PACK SPECIFICATIONSMET SetsMET Line(Hybrid) (TN735)

TECHNICAL SPECIFICATIONSPort Specifications (Contd)VOICE TERMINAL PORTS (Contd)STATION TYPEATLCordlessTelephoneCIRCUIT PACKATL Line(ZTN79)SPECIFICATIO

TECHNICAL SPECIFICATIONSPort Specifications (Contd)TRUNK PORTSTRUNK TYPECIRCUIT PACKSPECIFICATIONSAuxiliary TrunkTN763● Capacity: 4 Circuits● 3-pair

TECHNICAL SPECIFICATIONSPort Specifications (Contd)TRUNK PORTSTRUNK TYPE CIRCUIT PACKSPECIFICATIONSDS1 InterfaceTN767● Capacity: 24 Circuits● 4-Wire

TECHNICAL SPECIFICATIONSRecommended Central Office Trunk FacilitiesThe following table provides recommendations for CO trunks based on the number of v

FEATURES AND SERVICESAttendant Console, Switched LoopDescriptionIn System 25, the Attendant Console is used to answer incoming trunk calls that arespe

TECHNICAL SPECIFICATIONSAnalog Transmission CharacteristicsFrequency Response:(Station-To-Station or Station-To-CO Trunk, relative to loss at 1 kHz)FR

TECHNICAL SPECIFICATIONSAnalog Transmission Characteristics (Contd)Quantization Distortion:SIGNAL LEVELDISTORTION LEVEL+2 to -30 dBm035 dB-40 dBm0 29

TECHNICAL SPECIFICATIONSAnalog Transmission Characteristics (Contd)Single Frequency Return Loss (Talking State):Station to station—exceeds 12 dBStatio

ENVIRONMENTAL REQUIREMENTSFloor Plans And LayoutsTable Top SpaceWall Space RequirementsTemperature and HumidityAir PurityLightingElectrical Noise/Radi

FiguresFigure 6-1.Typical System 25 Equipment Area Floor Plan 6-2Figure 6-2.Typical System 25 Equipment Area Elevation Plan

ENVIRONMENTAL REQUIREMENTSENVIRONMENTAL REQUIREMENTSThis section provides information on floor and wall space requirements for System 25cabinets and a

ENVIRONMENTAL REQUIREMENTSSYSTEMCABINETS(FOOTPRINT)FRONTNOTE 3BACKBOARDTERMINATIONFIELD(NOTE 4)TABLENOTES:1. 115V AC, 60 Hz, 15 AMP OUTLETS(HUBBELL 52

ENVIRONMENTAL REQUIREMENTSFigure 6-2.Typical System 25 Equipment Area Elevation Plan6-3

ENVIRONMENTAL REQUIREMENTSTable Top SpaceThe following system equipment requires (customer provided) table top space in theequipment area:● System Cab

ENVIRONMENTAL REQUIREMENTSAir PurityThe cabinet should not be installed in an area where the air may be contaminated with any ofthe following:● Excess

Attendant Console, Switched LoopThe Switched Loop Console derives its name from the ability of the system to hold incomingattendant-bound calls in a q

ENVIRONMENTAL REQUIREMENTSEnvironmental Considerations for ATL Cordless Telephone SetThe ATL Cordless telephone set uses standard radio transmission t

ENVIRONMENTAL REQUIREMENTSThe base should be located at least; three feet away from any metal object (such as metalwindow frames), six feet away from

ENVIRONMENTAL REQUIREMENTSAC Power RequirementsEach System 25 cabinet requires 500 Watts at 115V ac (maximum).The System 25 power service must be a de

ENVIRONMENTAL REQUIREMENTSFigure 6-3. AC Power Distribution - Multiple Cabinet System6-9

ENVIRONMENTAL REQUIREMENTSGroundingConnection of an approved ground to the system cabinets is essential. An approved groundmay consist of any of the f

ENVIRONMENTAL REQUIREMENTS● Surge protection on the AC power to System 25 and associated equipment (SAT,SMDR, DTU, etc.) provided by the TII 428 Unit.

PARTS INFORMATIONParts Listed by PEC 7-1Parts Listed by COMMODE 7-9-i-

PARTS INFORMATIONPARTS INFORMATIONThis section contains information that may assist you in cross-referencing Apparatus CodesComponent Codes (COMCODEs)

PARTS INFORMATIONPECDESCRIPTION APPARATUS CODECOMCODE62507Digital Tape Unit TS-555A40407943662508System Administration Terminal TI-703404079428(SAT

PARTS INFORMATIONPECDESCRIPTION APPARATUS CODECOMCODE62514Emergency Transfer Unit10B ETU 103984118Consists of:Cables (2) (15 ft DE) B25A100017334Mod C

Features and Services● Position Busy [POS BUSY]: Temporarily removes the attendant position from service. (I-use and status LEDs on basic SLAC.)● Att

PARTS INFORMATIONPECDESCRIPTIONAPPARATUS CODECOMCODE62527NR3V3 Upgrade (R3V1/V2 to R3V3)Consists of:CPU/MEM CPZTN142107057754--Service Circuit CPZTN13

PARTS INFORMATIONPECDESCRIPTIONAPPARATUS CODECOMCODE2403-004Uninterruptible Power Supply **(UPS)2610-001STARLAN NETWORK527840003Network Extension Unit

PARTS INFORMATIONPECDESCRIPTIONAPPARATUS CODE COMCODE2781-004System Wiring-Hourly Rate2782-004System Wiring-Flat Rate2783-004(New) System Wiring Run,F

PARTS INFORMATIONPECDESCRIPTIONAPPARATUS CODE COMCODE3160-111(MAC30 Att)3161-172(MAC30 Att)3161-1613162-4123162-417(MAC30 Att)3162-BIS3162-DIS316

PARTS INFORMATIONPECDESCRIPTION APPARATUS CODE COMCODE31019External Alert **31021Ground Start KeyKS 23566,L1 40579283931032Message Waiting Z3A*In

PARTS INFORMATIONParts Listed by COMCODEThroughout the following table, “part of” is abbreviated as “P/O.”COMCODE PECDESCRIPTIONAPPARATUS CODE1000

PARTS INFORMATIONCOMCODE PECDESCRIPTlONAPPARATUS CODE103557112 63119103557161 63118103557203 63166103558916 P/O 62513103756334 No PEC10378678

PARTS INFORMATIONCOMCODEPECDESCRIPTIONAPPARATUS CODE1038711093170-00MSingle-Line VT7101A01A-003with Message Lamp& Recall Button103871844P/O 62512

PARTS INFORMATIONCOMCODEPEC103976171103981965103981981103982005103982658103984118104010061104109285104152558104154430104174750104174768104246616104305

PARTS INFORMATIONCOMCODEPECDESCRIPTIONAPPARATUS CODE10516726663115CO Trunk CPTN747B105196604No PEC Fanning Strip50A105243810P/O 62525A Documentation &

Attendant Console, Switched LoopDisplay (Figure 2-4)The SLAC contains an alphanumeric call information display. This module is built into thetop of th

PARTS INFORMATIONCOMCODEPECDESCRIPTION APPARATUS CODE4032426394038366204038641504039571294039615194040794284040794364050106124050106204051777914051931

PARTS INFORMATIONCOMCODE PECDESCRIPTIONAPPARATUS CODE527840102 2614-100AT&T STARLAN NETWORKNetwork Access Unit (NAU)845412956 No PECCPU/MEM*Inte

REFERENCE DOCUMENTATIONBasic ManualsSoftware PackagesIntegrated Solution DocumentsDescriptions of Basic Manuals8-18-18-28-2-i-

REFERENCE DOCUMENTATIONREFERENCE DOCUMENTATIONSystem 25 is supported by a complete set of basic and supplementary documentation andoptional software.T

REFERENCE DOCUMENTATIONIntegrated● Integrated● Integrated● Integrated● AT&T CallSolution DocumentsSolution User Guide

REFERENCE DOCUMENTATIONReference ManualThe principal technical reference for users of System 25. It provides reference material forsales support, syst

GLOSSARYGLOSSARYThis section provides explanations for acronyms and definitions of terms used in thismanual.ADU: (Asynchronous Data Unit)ARS: (Automat

GLOSSARYAttendantThe operator of the attendant console.Attendant Console● Direct Trunk or Switched Loop Attendant Console: An electronic call-handlin

GLOSSARYBridge (Bridging)The sharing of the same extension or line by two or more voice terminals.BufferA circuit or component that isolates one elect

GLOSSARYCentral Office TrunkA telecommunications channel that provides access from the system to the publicnetwork through the local central office.Ch

FEATURES AND SERVICESPlacing a Call on a LOOP ButtonIn general, originating a call at an idle SLAC involves going off-hook and then dialing thedesired

GLOSSARYCovering UserThe person at an alternate answering position who answers a redirected call (the coveragereceiver).D4 FramingD4 is the most preva

GLOSSARYData EndpointTwo general groups: those having a DTE-type interface, which encompasses almost all ofthe data terminal devices; and the group of

GLOSSARYEqualizationThe DS1 signal is shaped so that when it reaches the cable-end it conforms to theDSX-1 interface power specification.ErlangA traff

GLOSSARYForeign Exchange (FX)A central office other than the one providing local access to the public telephonenetwork.Foreign Exchange TrunkA telecom

GLOSSARYImmediate-Start Tie TrunkAfter establishing a connection with the distant switching system for an outgoing call, thesystem waits a nominal 65

GLOSSARYLoop Start TrunkAfter establishing a connection with the distant switching system for an outgoing call,System 25 waits for a short period of t

GLOSSARYOff-Premises Station (OPS)OnesAn arrangement provided by the local telephone company which permits remoteTerminal Equipment to operate as thou

GLOSSARYPersonal Dial CodeEach system user is assigned a PDC and is allowed to “sign in” the PDC at any voiceterminal in the system as he or she moves

GLOSSARYPublic NetworkThe network that can be openly accessed by all customers for local or long-distancecalling.QueueAn ordered sequence of calls wai

GLOSSARYSAT: (System Administration Terminal)SIP: (Station Interconnect Panel)SLAC: (Switched Loop Attendant Console)SMDR: (Station Message Detail Rec

Common carriers are required by law to collect their tariffed charges. While these charges arefraudulent charges made by persons with criminal intent,

Attendant Console, Switched LoopCall TypesThe following types of attendant-seeking calls are sent to the common queue and thendirected to an idle LOOP

GLOSSARYSwitchThe software-controlled communications processor complex that interprets dialingpulses/tones/key board characters and makes the proper i

GLOSSARYTone RingerA device with a speaker, used in electronic voice terminals to alert the user.TranslationsSpecific information assigned to a termin

GLOSSARYWide Area Telecommunications Service (WATS)A service that allows calls to a certain area or areas for a flat-rate charge based onusage.Wink-St

INDEXINDEX10-Button MET Set (2991 C/D05) 4-4610-Button MET Set With BIS (2993C04) 4-4812-Button MET Set (7203M) 4-502012D Transformer 4-562500 Serie

INDEXAttendant (Continued)Call Extending 2-14Call Waiting 2-16Camp-On 2-16Cancel 2-18Console, Connections 4-67Console, Direct Trunk 2-19Console

INDEXCircuit Packs (Continued)Optional 4-9Pooled Modem (TN758) 3-35, 4-12Required 4-8Service Circuit (ZTN131) 3-31, 4-8STARLAN Interface (ZTN84)

INDEXData Port Endpoints, Option Profiles 2-100DCE Devices 2-131Delay AnnouncementDirect Group Calling 2-150Equipment Connections 2-151, 2-241Night

INDEXFeatures (Continued)Attendant Camp-On 2-16Attendant Cancel 2-18Attendant Console, Direct Trunk 2-19Attendant Direct Extension Selection 2-34

INDEXFeatures Table (Continued)Station 2-4System 2-3Flex DSS 2-158Floor Plans And Layouts 6-1Following 2-182ForcedAccount Code Entry 2-8Release,

INDEXManuals (Continued)Administration 8-2Implementation 8-2Installation And Maintenance 8-2Introduction to System 25 8-2Reference 8-3Terminal O

FEATURES AND SERVICESFigure 2-4.Buttons and Display of BIS-34DRingingThe SLAC receives normal ringing on incoming calls. Abbreviated alerting (one sho

INDEXPosition Busy (Continued)SLAC 2-28PowerEquipment, Optional 4-61Failure Transfer (PFT) 2-262Requirements, AC 6-8Supply, 4-61Supply, KS-22911

INDEXSAT (Continued)On-Premises Switched Connections 2-325SelectionDirect Station 2-158Line 2-215Selector Console 2-34Send All Calls 2-281Service C

INDEXSystem (Continued)Block Diagram 1-2Cabinets (J58901A1 L4) 4-1Call Handling Capabilities 1-4Description 1-1Environmental Requirements 6-1Equ

INDEXVoice Message System 2-204, 2-361Voice Terminal2500 Series Adjuncts 4-18Adjunct Connection Information 4-55Adjunct Power Supplies 4-56Adjunct

Attendant Console, Switched LoopConsiderationsOne System 25 configuration can support either one or two SLACs or one or two DTACs,but not a combinatio

FEATURES AND SERVICESCall Waiting: Calls cannot wait at the SLACCallback Queuing: Calls that are originated without use of the START button can be qu

Attendant Console, Switched LoopHardware RequirementsEach console requires a port on a ZTN79 ATL Station circuit pack.Figure 2-5 provides a connection

FEATURES AND SERVICESAttendant Direct Extension SelectionDescriptionThis feature permits the attendant to extend calls tostations by pressing one or t

Attendant Direct Extension SelectionGROUP SELECT BUTTONSTESTAND ASSOCIATED LEDSBUTTONNOTE :STATUS LEDs are locatedto the left of each DXSbutton (00-99

FEATURES AND SERVICESA call parked via the Selector Console can be picked up at any voice terminal by dialing thePark retrieval code ( ✶ 8 ) and the n

Attendant Direct Extension SelectionCallback Queuing: Callbacks to the attendant do not flash at the associated SelectorConsole.Coverage: If the att

FEATURES AND SERVICESSYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLEPART OF SIPC2SIPW1B1ATTENDANTC1ADAPT.SELECTORB2 CONSOLET1C7400B2ADAPT.LEGEN

CONTENTSCONTENTSSection 1—OverviewSection 2—Features and ServicesSection 3—Functional DescriptionSection 4—Hardware DescriptionSection 5—Technical Spe

Attendant Forced Release (SLAC Only)Attendant Forced Release (SLAC Only)DescriptionThis feature drops all active parties from a call in which the atte

FEATURES AND SERVICESAttendant Join (SLAC Only)DescriptionThis feature allows the attendant, while extending an incoming call, to connect together the

Attendant Message WaitingAttendant Message WaitingDescriptionThis feature allows the attendant to remotely control the status of Message LEDs on users

FEATURES AND SERVICESCoverage Calls:The attendant can light the Message LED of the covered station whenreceiving a coverage call for the station.Hands

Attendant Position BusyAttendant Position BusyDescriptionThis feature allows an Attendant Console to be placed in an inactive mode.Systems with Direct

Features and ServicesA console in Position Busy mode can receive attendant PDC, DID, and DGC calls, and outgoingcalls can still be placed. Local funct

Attendant Position BusyForwarding: If a PDC/FPDC is signed in at an inactive attendant console, then calls to thisPDC/FPDC will go to the active atte

FEATURES AND SERVICESAttendant ReleaseDescriptionThis feature releases the attendant from unextended call. There are two forms of AttendantRelease: Ma

Attendant ReleaseInteractionsThe following feature interacts with Attendant Release.Attendant Camp-On:External calls that are releasedcamped on.Admini

FEATURES AND SERVICESAttendant Return Coverage On BusyDescriptionThis feature allows a camped-on call at a busy station or DGC Group to be returned to

OVERVIEWIntroductionOrganizationSystem 25 DescriptionCall Handling CapabilitiesSafetyBusiness Communications NeedsIncoming Business CommunicationsOutg

Attendant Return Coverage On BusyAttendant Direct Extension Selection: If a call to a Floating PDC (FPDC) is returned to theattendant, the FPDC’s sta

FEATURES AND SERVICESAttendant Return Coverage On Don’t AnswerDescriptionThis feature allows unanswered calls extended by the attendant to be returned

Attendant Return Coverage On Don’t AnswerCoverage:● DTAC only—Whenever a DTAC attendant is a coverage receiver for a particularcoverage group and a ca

FEATURES AND SERVICESAttendant Source and Destination (SLAC Only)DescriptionThis feature allows the attendant, while extending a call, to switch back

Attendant Splitting One-Way AutomaticAttendant Splitting One-Way AutomaticDescriptionThis feature allows the attendant to converse privately with a ca

FEATURES AND SERVICESAttendant System Alarm IndicationDescriptionThis feature provides a visible alarm on the Attendant Console to alert the attendant

Automatic IntercomAutomatic IntercomDescriptionThis feature allows a multiline voice terminal user including ATL cordless telephone (orattendant) to p

FEATURES AND SERVICESInteractionsThe following features interact with Automatic Intercom.Attendant Position Busy:The inactive attendant is permitted t

Automatic Route Selection (ARS)Automatic Route Selection (ARS)DescriptionThis feature provides for the routing of calls over the telecommunications ne

Features and Services● Calls made to specified COs or seven-digit telephone numbers within the Home NumberPlan Area (Home Area Code). These calls are

FiguresFigure 1-1.System 25 Block Diagram 1-2-ii-

Automatic Route Selection (ARS)Calls are checked to determine if they are international calls or operator calls. Dialed numbers “01”or 011 signify int

Features and ServicesAn FRL is typically lower for the first route in a subpattern and increases with each additional routein the pattern. A terminal’

Automatic Route Selection (ARS)● Area Code (NAA) Routing Table: Entries may include every North American NAA andSpecial Number NAA, each with an asso

Features and Services●●ARS:●●●●●●●●●Specify whether “Dial 1” is needed for toll calls within your area code. (This requirement isignored for the 10-di

Automatic Route Selection (ARS)— Subpattern A Start and End Time (Hour:Minute).— Subpattern A and B—Route 1, 2, and 3 Facility Access Codes (1-9999) o

FEATURES AND SERVICESSTATION USERDIALS ARSACCESS COOE[401]NUMBER DIALEDON EMERGENCYNUMBERS LIST(911, ANDTHREE CUSTOMERDEFINED 7-DIGITNUMBERS[601-603]V

Automatic Route Selection (ARS)FROMSHEET 1NUMBER DIALEDWITHIN HOMENPA?SYSTEM [30]NUMBER DIALEDOUTSIDE HOMENOON FNPANOEXCEPTIONYESCALL ROUTEDNPA (FNPA)

FEATURES AND SERVICESROUTING SUBPATTERNS (RSP) A AND BRSP AROUTE 1 ROUTE 2ROUTE 3START/POOLEDPOOLEDPOOLEDCOSTOPFACILITY FACILITYFACILITYOVERFLOWTIMEAC

Bridging of System Access ButtonsBridging of System Access ButtonsDescriptionThis feature allows a multiline station user to handle calls on Bridged A

FEATURES AND SERVICESThe user active on a BA button can use many features with the bridged call; operation is nodifferent from calls on other buttons.