Lucent Technologies SLC-2000 Access System Central Office Terminal, Assembly Manual

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3-48 Issue 5 May 1997
363-208-010
Cabling, Wiring, and Assembly
Tests
Step 1: Verify continuity of all installed connections to the customer’s power
plant and ringing supply.
Step 2: Verify absence of any shorts between the RTN terminals and the -48v or
20 Hz terminals of the Power Interface Unit.
Step 3: Turn on BDFB circuit breakers and install or power up the associate ring-
ing supplies temporarily.
Step 4: Verify the presence of -48v dc and ringing voltage at the PIU.
Requirement:
-42 to -56 volts approx. 105 volts ac
Step 5:
Verify the presence of -48v dc at the ARM/UIP -48v (A)/-48v RTN and -
48v (B)/-48v RTN jacks.
Requirement:
-42 to -56 volts dc
Step 6: Turn off the BDFB breakers and disconnect the two ringing supply
sources.