Chapter 18 Maintenance and Troubleshooting
Resolving problems
SmartClass TPS User’s Guide
June 2014 22035456, Rev 001 149
– Copper tests
General test problems
The following section addresses questions about testing in general.
Issue
Inconsistent test results.
Resolution
Verify that your test leads are good and are connected properly for the test you are performing.
DSL test problems
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 or VDSL at the CO.
– Test at the CO/Exchange on the customer pair.
– Check the DSLAM modem vendor and software version.
Issue
The modem gets sync with the CO, but the rate is lower than expected.
Resolution
Verify that you are on an ADSL2/2+ or VDSL line, as appropriate.
Check the bits/tone and the SNR/tone for areas of the spectrum with low throughput. This could be
caused by bridged taps, cable crosstalk, or AM radio.
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.
To Next Page
Loading...
