ZyXEL Communications ALC1024, User Manual

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Commands with EEC
Troubleshooting with EEC 14-9
Chapter 14
Troubleshooting with EEC
This chapter covers potential problems and possible remedies. After each problem description, some
steps are provided to help you to diagnose and to solve the problem.
14.1 DSL LED(s)
A DSL LED is not on.
Table 14-1 Troubleshooting the DSL LED(s)
STEPS CORRECTIVE ACTION
1 Make sure the DSL port is enabled (refer to the enabling DSL ports sections in the chapter on ADSL
commands).
2 Connect a DSL modem directly to the DSL port of the line card using a different telephone wire.
If the LED turns on, go to step 4.
3 Check to see that the settings in the DSL modem or router match those of the DSL port (refer to the
chapter on ADSL commands).
If the DSL LED stays off, there may be a problem with the port. Contact the distributor.
4 Take the DSL modem to the subscriber’s location.
If the DSL LED stays off, check for a problem with the telephone wiring that connects to the
subscriber.
14.2 Data Transmission
The DSL LED is on, but data cannot be transmitted.
Table 14-2 Troubleshooting Data Transmission
STEPS CORRECTIVE ACTION
1 Check to see that the VPI/VCI settings in the DSL modem or router match those of the line card
(refer to the enabling DSL ports sections in the chapter on ADSL commands).
Also, make sure that the DSL modem or router is using RFC 1483 encapsulation, bridge mode and
LLC- based multiplexing.
2 Make sure that the line card’s IP settings are properly configured; refer to the chapter on IP
commands.
3 Check the line card’s VLAN configuration.
Refer to the chapter on bridge commands and the chapter on IEE tagged VLAN commands.
4 Ping the line card from the computer behind the DSL modem or router.