Distribution Field - AT&T 75 Wiring Manual

The 110A-type terminal blocks that can be used for the Trunk/Auxiliary Field are the
110AC1-300STM/6 which has male connectors that exit the top of the terminal block and the
110AC1-300STF/6 which has female connectors that exit the top of the terminal block.
The 300-pair 110P-type terminal block that can be used for the Trunk/Auxiliary Field is the
110PC1-300CT which has connectors that exit the top of the terminal block.
The recommended 900-pair 110P-type terminal block for the Trunk/Auxiliary Field is the
110PC1-900CB because the connectors exit the terminal block at the bottom which allows for
easy cable routing to the floor and the recommended use of cable slack managers with the
system. The 110PC1-900CT Terminal Block which has connectors that exit the top of the
terminal block can be used for the Trunk/Auxiliary Field if cable routing from the top is
desirable.

Distribution Field

The Distribution Field contains four distinct cross-connect areas:
The purple field (port field) connects to the switch via 25-pair cables. Each line
circuit pack connects to one 25-pair row of the 110-type terminal block. One 25-pair
cable is required for each line circuit pack (see Note).
Note: This is the case except for the 16 port analog line board and the MET
line board. The 16-port analog line board connects to two 25-pair rows of the
110-type terminal block and two MET line boards connect to one 25-pair row of
the 110-type terminal block. Both boards require use of an adapter or
concentrator cable.
The yellow field (auxiliary field) connects all 25-pair cables from the auxiliary
cabinet and the AP, when either is used. The yellow field is usually small and is
located at the lower right-hand corner of the purple field.
The white field (station field) connects to the station wiring. The white field
indicates 3-pair station circuits (eight circuits per 25-pair cable) which are routed
through a satellite closet.
The blue field (station field) indicates 3- and/or 4-pair station circuits (eight or six
circuits, respectively, per 25-pair cable). The fourth pair, of the 4-pair station circuit,
is used to supply adjunct power from the cross-connect field on an as-needed basis to
terminals within 250 wire feet length of the cross-connect field.
Figure 3-21 shows a 300-pair terminal block arrangement for the system Distribution Field
with a capacity of 192 three-pair port circuits (purple field) and either 192 three-pair station
circuits (white or blue field) or 144 four-pair station circuits (blue field).
Figure 3-22 shows a 300-pair terminal block arrangement for the system Distribution Field
with a capacity of 384 three-pair port circuits (purple field) and either 384 three-pair station
circuits (white or blue field) or 288 four-pair station circuits (blue field).
Figure 3-23 shows a 900-pair terminal block arrangement for the system Distribution Field
with a capacity of 576 three-pair port circuits (purple field) and either 576 three-pair station
circuits (white or blue field) or 432 four-pair station circuits (blue field).
Figure 3-24 shows a 900-pair terminal block arrangement for the system Distribution Field
with a capacity of 1152 three-pair port circuits (purple field) and either 1152 three-pair
station circuits (white or blue field) or 864 four-pair station circuits (blue field).
110-TYPE HARDWARE
3-35