AT&T Classic Mail Design Package 1.6 Uživatelský manuál stáhnout pdf (Strana 41)

Equipment Physical Design Standards ATT-TP-76200, Issue 19

AT&T Services, Inc. June 2014

E. Doors, slide drawers should not require more than 30 inches space into aisles to

use.

F. Four post framework shall allow for room ventilation air to freely enter and exit

enclosure. Doors, side panels, blanking panels and top panels shall be designed for

controlled front to rear air flow if provided.

Equipment Floor Loading

An individual framework loaded with equipment shall be designed and constructed to floor

load requirements of less than 560 kg/m

(114.7 lb./ft

) The floor loading for an equipment

framework is calculated by dividing the frame weight by the area of a rectangle bounded

by the extended frame sides and half of the front (3 ft -0 in. or 18 in) and half of the rear (

2 ft.-6 in. or 15 in.) aisles. The standard framework footprint to be used in AT&T

calculations would be 26 in. wide and 24” deep. For four post frameworks use footprint

dimension of framework and same front and rear aisle dimensions. Total weight of

equipment should include all cables that may be required in normal field installation.

Equipment Units

Equipment units:

A. Shall be designed so they are installed from the front and cabled from the rear of

equipment framework assemblies,

B. Shall incorporate the use of holes or closed slots in mounting hardware for attachment

to equipment framework mounting surfaces, and be designed for 23” nominal width

framework,

C. Shall accommodate mounting in equipment frameworks using the 1-3/4 x 23 inch

mounting hole pattern shown in Figure 11-1, and

D. Limited applications of products that will not permit rear access will require that

equipment be designed strictly for front access where cabling, maintenance and normal

service be performed from front only. These products shall be designed for front access

and indicated on form ESP-001 and/or ESP-002 , Engineering Data, Equipment

Locating Restrictions as YES, “Front Access Only” Only those products intended

for limited applications such as CEV installations, ETSI compliant products or other

AT&T authorized use shall be designed for front access.

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AT&T Classic Mail Design Package 1.6 Uživatelský manuál Strana 41