JDS Uniphase OneExpert DSL, Руководство пользователя

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Appendix A Troubleshooting
Resolving problems
OneExpert DSL User’s Guide
94
22052280, Revision 001 April 2014
DSL testing
The following section addresses questions about DSL testing.
Issue
The modem cannot achieve sync with the CO.
Resolution
Inability to sync can have many causes. Perform the following steps to troubleshoot:
• Disconnect the customer's DSL modem.
• Verify tester connection to the correct pair.
• Verify the Data mode.
• Verify that the Standard is correct (ADSL2+, G.DMT, Auto, etc.).
• Isolate premise wiring.
• Check for premise alarm system.
• Verify the copper pair is provisioned for ADSL at the CO.
• Test at the CO/Exchange on the customer pair.
• Check the DSLAM modem vendor and software version.
Issue
The modem achieves sync with the CO, but the rate is lower than expected.
Resolution
Verify that you are on an ADSL2, ADSL2+, or VDSL line, as appropriate.
Check the DSLAM configuration - the max rate may be limited there.
Check for premise alarm system on the same pair.
Avoid excessive loop length or high attenuation.
Make sure that you are connected on pins 3 and 4.
Verify the noise margin.
Check the attenuation.
Make sure that you are connected on pins 3 and 4 instead of 2 and 5.
Data testing
The following section addresses questions about Data testing.
Issue
The IP ping menu says pings are being sent, but the network statistics are not incrementing.