Harris ACS-163, Руководство по установке и эксплуатации

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6-Testing & Troubleshooting ACS-160 Series & STL-160 Series T1 Mux Installation & Operation
Version 2.11, August 2011
Harris Corporation 6-11
Intraplex Products
** The LPBK and ALERT lights only turn on when an internal loopback is activated, not when an
external loopback is created.
6.4.2 Drop and Insert Multiplexer Testing
For a typical three-site drop/insert system (terminal at Location 1, drop and insert multiplexer at
Location 2, and terminal at Location 3), test in this order:
1. Test the terminal at Location 1 first.
2. Use the procedure to test the drop/insert multiplexer at Location 2.
3. Test the terminal at Location 3.
In this procedure, “DI-A” refers to the CM-5RB module in physical slot 1, terminating the T1 line
between Locations 1 and 2, and “DI-B” refers to the CM-5RB module in slot 2, terminating the T1 line
between Locations 2 and 3. (If you are using a redundant CM-5RB module, remove the inactive
module for this test.) Perform these steps:
1. To verify that the DI-A CM-5RB module is set to DI-A mode, and the DI-B CM-5RB module is set
to DI-B mode, perform these steps for each CM-5RB:
a. Remove the module for a few seconds.
b. Re-insert it.
c. Observe that it displays the correct mode (DI-A or DI-B). If it does, go to Step 2.
d. If the module does not display the correct mode, check and correct the mode switch settings,
if needed, on the module adapter at the rear of the shelf. (Section 3.5 –
Module Adapters
gives the specific settings.)
2. To verify that T1 frame format and line code are set correctly for the T1 service available for each
CM-5RB module, perform these steps:
Note: Always use ESF framing and B8ZS line code unless your CSU or T1 service provider cannot
support them.
a. Press down repeatedly on the GROUP switch until the display shows TSEL.
b. Press down repeatedly on the SET/NEXT switch until the display shows the desired frame
format (SF or ESF). If the green (top) light is on, this frame format is selected.
c. If the green light is off, press up twice on the SET/NEXT switch to select this format.
d. Press down on the SET/NEXT switch to display the desired line code (B8ZS or AMI). If the
green light is on, the line code is set to the displayed value.
e. If the green light is off, press up twice on the SET/NEXT switch to change the line code to the
displayed value.
3. Put one end of a T1 patch cord or a 100 ohm termination plug into the T1 IN EQUIP jack of the DI-
B CM-5RB module, establishing a “no signal” condition at the DI-B T1 input. This condition forces
the DI-A CM-5RB module to revert automatically to fallback (internal) timing.
4. Using a second patch cord, establish a loopback of the DI-A CM-5RB module by connecting its T1
OUT EQUIP jack with its T1 IN EQUIP jack. (Alternatively, activate the equipment loopback [EqLB]
on the DI-A CM-5RB module).
5. Once the loopback is established, verify that the lights on the DI-A CM-5RB module respond (Table
6-7).