Wall Space Requirements; Equipment Requirements; Cable Slack Manager Requirements; 66-Type Hardware Requirements - AT&T 75 Wiring Manual

66-TYPE HARDWARE

Wall Space Requirements

The Trunk/Auxiliary Field and the Distribution Field are mounted on the same wall. If the
66-type connecting blocks are being mounted on the 183-type backboards, each 183A-type
backboard is approximately 8-1/2 inches (21.6 cm) wide and 20 inches (50.8 cm) tall. Each
183B-type backboard is approximately 17 inches (43.2 cm) wide and 20 inches (50.8 cm) tall.
If the multiple mountings are being used, each 166-type mounting is approximately 17 inches
(43.2 cm) wide and 20 inches (50.8 cm) tall. Each 154A-type mounting is approximately 8-
1/2 inches (21.6 cm) wide and 20 inches (50.8 cm) tall.
If the 66-type connecting blocks are being mounted on the wall by themselves, the size
requirements of the 183-type backboards should still be used to figure the amount of wall
space required for the connecting blocks. This will allow for sufficient spacing between the
connecting blocks for jumper wires and cable connections. The space requirements for each
183A-type backboard will mount 4 66-type connecting blocks and the space requirements for
each 183B-type backboard will mount 8 66-type connecting blocks.
The 187B1 backboard equipped with pegs, is approximately 17 inches (43.2 cm) wide and 6-
1/2 inches (16.5 cm) tall.

Equipment Requirements

Cable Slack Manager Requirements

Each cable slack manager is approximately 32 inches (81.3 cm) wide. The number of cable
slack managers needed for the system can be found by dividing the total length of the cross-
connect field in inches by 32. Any partial numbers of .4 or less should be rounded down to
the whole number and any partial numbers of .5 or more should be rounded up to the next
whole number (for example: 2.4 = 2 cable slack managers and 2.5 = 3 cable slack managers
required).

66-Type Hardware Requirements

Table 4-F lists the requirements for the 66-type hardware according to system size to
provide 1-, 2-, 3-, or 4-pair distribution to the station wiring. Each 66 connecting block can
connect 25-pair of wire and the number of blocks that are needed per system depends on the
number of pairs that are run per station.
4-32