363-206-305 Detailed Level Procedures:
DLP-507
Issue 3, June 2000 Page 5 of 8
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
20. Does the meter indicate between −4 and −15 V DC?
21. Has the channel unit been replaced for this test (off hook voltage check)?
22. Check the test connections and correct them if needed. If the indication is not
−4 to −15 V DC, replace the channel unit and repeat from Step 16.
23. Use enclosure drawings to check wiring. Look for a tip and ring reversal
between the NBS backplane and TB1. Verify the LDS channel and number
assignments. Correct the problem before continuing with the next step.
24. Is dial tone present?
25. Has the channel unit been replaced for this test (check dial tone)?
26. Check test connections and correct them if needed. If no dial tone is present,
replace the channel unit and repeat from Step 16.
27. Use enclosure drawings to check wiring. Look for a tip and ring reversal
between the NBS backplane and TB1. Also check T0 cross connects and
verify the LDS channel and number assignments. Correct the problem before
continuing with the next step.
If YES, proceed to Step 24.
If NO, continue with Step 21.
If YES, proceed to Step 23.
If NO, continue with Step 22.
If YES, proceed to Step 28.
If NO, continue with Step 25.
If YES, proceed to Step 27.
If NO, continue with Step 26.
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