AT&T System 75 Wiring Diagram page 236

jumpers must be connected between one row/connecting block in the white
field and up to three rows/connecting blocks in the purple field as shown in
Figure 3-56. At the station location, a WP-90929, List 1 concentrator cable is
used. There are eight station appearances on each of the three fingers of
the concentrator cable.
356A
ADAPTER
OUT-OF-
BUILDING
ANALOG
TELEPHONES
(NOTE)
B25A* OR
A25D† CABLE
NOTE:
THE MAXIMUM CABLING DISTANCE FROM THE SWITCH CABINET
TO OUT-OF-BUILDING VOICE TERMINALS IS 6000 FEET OF 24 AWG WIRE.
* USED WITH 66-TYPE-CONNECTING BLOCK
† USED WITH 110-TYPE TERMINAL BLOCK
Figure 4-23. Connections for Each Group of Eight Out-of-Building Analog
telephones
A25B
CONCENTRATOR
CABLE
CABLE
(WP90929,
LIST 1, CABLE
ASSEMBLY)
PART OF CROSS-CONNECT FIELD
STATION
SIDE
JUMPERS
WHITE
FIELD
Miscellaneous Wiring Installation
LOCALLY ENGINEERED
OUT-OF-BUILDING
WIRING
MULTI-PAIR PROTECTOR
UNITS (PRIMARY PROTECTORS
WITH HEAT COILS OR
EQUIVALENT)
SWITCH
SIDE
TN742 OR
T
TN769
R CIRCUIT
PACK PORT
PURPLE
FIELD
4-39