SYSTEM RACK

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.

4-16