AT&T System 25 - Manual (Page 154)

INSTALLATION
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11.
Set switch to NORMAL position.
Using a D4BY (single-ended) modular cord, connect D-181321 kit of
parts (Figure 2-56) to a KS-22911, L2 power supply (-48V dc).
Connect terminals -V and GRD on 278A adapter to D-kit.
If background music is desired, connect terminals Ml and M2 on the
278A Adapter to the customer-provided music source.
Connect the 278A adapter to a 103A connecting block, using 4-pair
inside wiring cable. Make the following connections:
278A Term. 103A Term.
CT 1
CR 2
C1 5
C2 6
Using a D4BU cord, connect the paging system to the connecting
b l o c k .
If you are installing a PagePac system, connect the speakers to the
receptacle on the back of the PagePac system.
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