3-34 Issue 4 February 1997
363-208-011
Cabling, Wiring, and Assembly
Customer's DC Power and Ringing Supply
Connections
General
NOTE:
External DC power and ringing connections from the customer’s supplies
must be made to the
SLC
-2000 COT Bay Power Interface Unit (ED7C723-
30). Power and ringing are not provided within the COT Bay.
NOTE:
Each power input (separate A and B feeders) lead and its associated
return must not exceed the maximum wire size of 10 gauge at the PIU.
Each -48 volt feeder should be protected with a 30 amp circuit breaker.
NOTE:
A ringing supply must be provided for connections to the COT Bay. Both
positive and negative 20 Hz ringing current generators should be
equipped. The interconnecting cable should be a twisted triple (20-24
gauge) for each of the two ringing generators furnished. When intercon-
necting with the J1C182BC shelf the ED7C723-35 Group 9 Cable Assem-
bly should be utilized.
NOTE:
The Power Interface Unit employs screw down terminals for connecting the
ancillary cables. Do not attempt to connect wires larger than the capacity
(10 gauge) of these terminals. Remove the unit’s side panel for easier
access.
NOTE:
Ensure that no
SLC
-2000 circuit packs are in place.
DC Power Connections
Step 1:
Connect the office battery -48v and return leads as follows:
-48v A TB 1
-48v A RTN TB 2
-48v B TB 3
-48v B RTN TB 4
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