ACS-160 Series & STL-160 Series T1 Mux Installation & Operation
6-Testing & Troubleshooting
Version 2.11, August 2011
6-18
Harris Corporation
Intraplex Products
No procedure or guidelines, however, can cover all possible situations. If you have reached what
appears to be a dead end, or if the information in this section does not seem to apply to your case,
please contact Harris Customer Service at (217) 222-8200 for assistance in troubleshooting your ACS-
160 Series system.
6.6.1
Trouble Types
ACS-160 Series system troubles fall into these three basic categories (Figure 6-11):
●
Setup errors
●
T1 network problems
●
ACS-160 Series equipment problems
The basic objective of any troubleshooting is to determine the type and location of a problem. Once
you make this determination, taking one of these actions usually restores the ACS-160 Series system:
●
For setup problems, re-configure the multiplexer or multiplexers that are not set up correctly.
●
For public network problems, work with your Local or Inter-Exchange carrier to correct the
situation. For private network problems, consult the network manager.
●
For equipment problems, replace the bad module or modules with spares.
6.6.2
Troubleshooting Guidelines
Remember these guidelines to troubleshoot an ACS-160 Series system:
●
In general, always check for setup errors before performing in-service or out-of-service tests.
Setup problems might not appear immediately. For example, if at installation time both
multiplexers in a point-to-point system are incorrectly set to use AMI instead of B8ZS line coding,
errors might not occur until later when a data pattern with insufficient ones density is transmitted.
●
If a problem occurs on a single channel, always check to see if similar troubles exist on other
channels. If troubles exist on multiple channels at the same time, the source of the channel
troubles is probably a T1 circuit or CM-5RB failure, rather than several simultaneous channel
module failures.
●
To isolate “soft” trouble, such as a low bit error rate on a data channel or occasional clicks or pops
on audio channels, try in-service T1 circuit monitoring (Section 6.5.2) before performing out-of-
service testing. This monitoring can minimize overall circuit down-time.
●
To isolate “hard” trouble, such as when troubleshooting a system that is unavailable because of a
high error rate or loss of frame synchronization, use a loopback procedure (Section 6.3.1) or
perform an out-of-service test (Section 6.5.3). Once a system is in hard failure, you do not incur
additional downtime by using these techniques.
6.6.3
Typical Troubleshooting Procedure
Perform these steps to troubleshoot an ACS-160 Series system:
1.
At each location, verify that the POWER indicator on the main power supply is on.
•
If the POWER light is off, there is a power-related problem. Check the power source and power
connections.
•
If you suspect an internal problem on a power supply, use Section 6.6.4 –
Power Supply Test
to check the voltages on the supply.
2.
Check that the CPU indicator light on the CM-5RB module is off. If this light is on, the CM-5RB CPU
(central processing unit) is bad. Replace the module with a spare.
3.
Remove and reinsert the CM-5RB module (once for each CM-5RB module on a dual terminal or a
drop and insert multiplexer). When the module is reinserted, the alphanumeric display shows the
CM-5RB mode (TERM, DI-A, or DI-B) for several seconds.
Summary of Contents for Intraplex STL-160 Series
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