Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 85)

Monitoring and Troubleshooting
Verilink Access System 2000: The Basics 5-19
System Fault
Isolation
The system flow in Figure 5-3 is intended for system start-up
problems. Troubleshooting an individual system module requires
that module’s documentation.
Check System
Power
An indication of system power problems is the lack of illuminated
LEDs on any/all of the modules. This indication is caused by faulty
power supplies, faulty modules, or lack of local power. To isolate a
system power fault:
1. Check local power voltages.
If local power is normal:
2. Check power supply voltage.
If the power supply voltages are out of tolerances:
3. Replace the affected power supply.
Verify Self Test When power is applied to the system, the system modules perform
a self-test. If any module fails self test:
1. Verify that the rear module is the valid type for the front
module being used.
2. Check the module and associated rear connector module. If
the module appears to be good:
3. Reinstall the module. If the module fails self-test:
4. Replace the module and verify self-test.
Check System
Configuration
Most AS2000 problems are related to system configuration. The
system must be properly configured to meet specific site operating
parameters and both ends of the point-to-point circuit need to have
the same configuration. To check system configuration, refer to
the individual module’s documentation.
NET Loopback A loopback plug can be used to determine whether or not a
application module is defective. If the Net LED is red, install a
loopback plug and perform a loopback test.
1. If the Net LED changes from red to green, notify the telco to
check for a line problem.
2. If the Net LED stays red, recheck system configuration.
3. If the problem is not corrected, replace the affected module.