DLP-507
: Detailed Level Procedures 363-206-305
Page 4 of 8 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
12.
NOTE:
The terminal block designation
CU1,A
through
CU1,D
corresponds to the
four drops coming from the channel unit mounted in Slot 1. Likewise,
CU6,D
corresponds to the fourth drop coming from the channel unit
mounted in Slot 6;
CU7,A
corresponds to the first drop coming from the
channel unit mounted in Slot 7; and
CU12,D
corresponds to the fourth
drop coming from the channel unit mounted in Slot 12. The terminal
assignments for all 12 shelf slots are shown on the inside of the drop
terminal block access door.
Connect the test telephone to the tip (white) and ring (orange) terminals of
CU1,A
(Figure 3).
13. Get a volt-ohm-meter (VOM) and condition it to measure DC volts.
14. Connect the (+) red lead of the VOM to the tip conductor and the (−) black lead
to the ring conductor of the test telephone.
Requirement: −48.0 V DC for POTS or loop-start
SPOTS
15. Does the VOM indicate −48.0 V DC?
16. Check test connections and verify you are set up for loop-start function. If the
indication is still not −48.0 V DC, replace the channel unit.
17. Does the VOM indicate −48.0 V DC?
18. 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.
19. Lift the test telephone handset off the hook.
If
YES
, proceed to
Step
19
.
If
NO
, continue with
Step
16
.
If
YES
, proceed to
Step
19
.
If
NO
, continue with
Step
18
.
To Next Page
Loading...