363-206-305 Detailed Level Procedures:
DLP-512
Issue 3, June 2000 Page 3 of 6
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
15. At NBS, does test telephone ring normally?
16. Check for tip and ring reversal.
17. Verify that the RGU FAIL indicator is not lit and ringing voltage is present (see
DLP-508 for requirements). Then replace, one at a time: NBS channel unit first
and then CO channel unit. Repeat this procedure from Step 4 after each
replacement.
18. Correct tip and ring reversal error at CO and NBS, and repeat from Step 14.
19. At NBS, lift telephone handset during ringing.
20. At NBS, does ringing trip normally?
21. Verify that the RGU FAIL indicator is not lit and ringing voltage is present (see
DLP-508 for requirements). Then replace, one at a time: NBS channel unit first
and then CO channel unit. Repeat this procedure from Step 4 after each
replacement.
22. At NBS, get volt-ohm-milliammeter (VOM) and condition it to measure DC
volts.
23. Make sure test call is established and held between CO and NBS.
24. At NBS, connect (+) red lead of VOM to tip terminal and (−) black lead to ring
terminal of DT test telephone.
If YES, proceed to Step 19.
If NO, continue with Step 16.
If OK, continue with Step 17.
If NOT OK, proceed to Step 18.
If YES, proceed to Step 22.
If NO, continue with Step 21.
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