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SYSTEM RACK
4-16
Processor’s Device Activity window. If neces-
sary, press the reset button S1on the NetNim to
activate the clock status.)
PCM Bank Verification
PCM Bank Verification requires two Channel
Interface Modules (CIMs).
1. On both CIMs place a patch cord from the top jack
of J1 to the top jack of J2 (see Figure 10-1).
2. Close S1, sections 3-4; open sections 1-2 on each
module.
3. On both CIMs set switch sections as follows:
Switch Section
S3 1-2 open; 3-4 closed
S4 1-2 closed; 3-4 open
S5 1-2-3-4 closed.
4. Set one module for System Test "5"
(S5-sections 1 and 3 open; sections 2 and 4 closed).
Place this module in any slot on Shelf 1.
5. Set the second module for System Test "6".
(S5-sections 2-3 open; 1-4 closed). Place this
module in any slot on Shelf 6.
6. Loop Primary Tx PCM to the Primary Rx PCM by
connecting a cable (023-3039-842) from Shelf 1-J3
to Shelf 1-J4 (see Figure 4-5).
7. The modules display an "A" if the PCM bank is
good. Press S2 to reset the module if "A" is not
displayed.
• A failure on the primary displays a "1" on one or
both modules.
• A failure on the secondary displays a "2" on one
or both modules.
8. Repeat this procedure by moving the module on
Shelf 6 to Shelf 5. Reset both modules if "A" is not
displayed.
9. Repeat this procedure by moving the module on
Shelf 5 to Shelf 4. Reset both modules if "A" is not
displayed.
10.Repeat this procedure by moving the module on
Shelf 4 to Shelf 3. Reset both modules if "A" is not
displayed.
11.Repeat this procedure by moving the module on
Shelf 3 to Shelf 2. Reset both modules if "A" is not
displayed.
12.After the PCM bank has proven good, force failures
on both the primary and secondary as follows:
Primary
• Remove cables on Shelf 1, J5 and J6.
• A "1" on both modules indicates a Primary
failure.
• Reconnect the cables.
Secondary
• Remove cables on Shelf 1, J23 and J24.
• A "2" on both modules indicates a Secondary
failure.
• Reconnect the cables.
• Remove the cable from Shelf 1, J3 to J4.
13.Remove CIMs from rack and patch cords from
J1-J2.
VTM PCM Bank Verification
This requires the use of one CIM and one VTM1.
1. Verify the VTM1 card is in Shelf 1-slot 2.
2. On the VTM1 connect a Transmission Test Set to
TP1 and TP2 (common).
3. On the VTM1 set S2 to select the 1020 Hz align-
ment tone. The tone should be heard in the Test Set
speaker. Adjust the monitor volume as necessary.
4. Set the CIM for System Test "1".
(S5, section 1 open; sections 2,3,4 closed.)
5. Place the module in any slot on Shelf 1.