ZyXEL Communications AAM1212-51, User Manual

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AAM1212-51/53 Series User’s Guide
Chapter 55 Troubleshooting 415
55.5 DSL Data Transmission
The DSL link is up, but data cannot be transmitted.
55.6 There Is No Voice on a DSL Connection
The AAM1212 has internal splitters and CO side Telco-50 connectors that allow the telephone
wiring used for DSL connections to also simultaneously carry normal voice conversations.
55.7 Testing Wiring
Use the following tests if there is no voice.
Table 103 DSL Data Transmission Troubleshooting
STEPS CORRECTIVE ACTION
1 Check the switch mode and port isolation settings.
Check to see that the VPI/VCI and multiplexing mode (LLC/VC) settings in the
subscriber’s DSL modem or router match those of the DSL port.
If the subscriber is having problems with a video or other high-bandwidth services, make
sure the AAM1212’s DSL port’s data rates are set high enough.
2 Check the VLAN configuration.
3 Ping the AAM1212 from the computer behind the DSL modem or router.
4 If you cannot ping, connect a DSL modem to a DSL port (that is known to work).
If the DSL modem or router works with a different DSL port, there may be a problem with
the original port. Contact the distributor.
5 If using a different port does not work, try a different DSL modem or router with the
original port.
Table 104 DSL Voice Troubleshooting
STEP CORRECTIVE ACTION
1 Make sure the subscriber has a splitter properly installed.
2 Check the DSL line pin assignments shown in Appendix C on page 429 .
3 Check the telephone wire connections between the subscriber and the MDF(s).
4 Check the telephone wire and connections between the MDF(s) and USER port(s).
5 Check the telephone wire and connections between the MDF(s) and the CO connector(s).
Check the connection from the MDF(s) to the telephone company or the PBX.
6 Check the telephone wire mapping on the MDF(s).
7 Make sure the in-house wiring works and is connected properly.
8 Repeat the steps above using a different DSL port.