AT&T System 75 Wiring Diagram page 235

CHAPTER 4. STATION WIRING
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 11O-TYPE TERMINAL BLOCK
Figure 4-22. Connections for One to Eight Out-of-Building Analog
Telephones
Figure 4-23 shows the connections for up to 24 off-premises analog
telephones. Concentration of analog line pairs is used at both buildings to
minimize the off-premises wiring required. At the cross-connect field,
4-38
356A
ADAPTER
B25A
CABLE
WITH HEAT COILS OR EQUIVALENT)
PART OF CROSS-CONNECT FIELD
STATION
SIDE
WHITE
JUMPERS
FIELD
LOCALLY ENGINEERED
OUT-OF-BUILDING
WIRING
MULTI-PAIR PROTECTOR
UNITS (PRIMARY PROTECTORS
SWITCH
SIDE
TN742 OR
T
TN769
CIRCUIT
R
PACK PORT
PURPLE
FIELD