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Applications
Issue 4 February 1997 A-17
Power and Ringing Interconnections
External sources are required to provide dc power and ringing voltages to the
COT Bay. Typical examples are the Lineage
Power Plant, the Cabinet Power
System, and the J1C182BC Ringing Shelf.
Power
Two dc power feeder pairs, each protected with a 30 amp circuit breaker are
required from the -48 voltage source. Wire gauge requirements are dependent on
the length of the feeders as follows:
Ringing
At least two external ringing supplies in a protected system should be provided,
each supplying -20Hz and +20Hz ringing current to the COT Bay. Figure A-6
represents a typical arrangement utilizing the J1C182BC-1 Ringing Shelf
equipped with 3C type Ringing Supplies with the capability of supplying four COT
Bays. Note that using this arrangement employs also the factory assembled
cables ED7C723-35 Group 9 and Group 10. Using the central office main ringing
supply or other vendors' ringing supplies would require another cable
arrangement requiring field assembly.
less than 30 feet 10 gauge
more than 30 feet gauge wire to limit dc drop to 1.5v max. at 25 amps, splicing down
to 10 gauge before connecting at TB1.
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