The Site > Old Forums > Southeast Asian Broadband > Digitel - High number of TX errors

reply to sashwa

Re: Digitel - High number of TX errors

I did some checking around for you and this is what I was told:

They need a tech to fix their DSL line. FEC errors are from interfernce local to them either from the lines missing insulation (bare wires) local AM Radio, Ham Radio, and similar transmitters.

»en.wikipedia.org/wiki/ADSL quote:

During initial training, the ADSL modem tests which of the available channels have an acceptable signal-to-noise ratio. The distance from the telephone exchange, noise on the copper wire, or interference from AM radio stations may introduce errors on some frequencies. By keeping the channels small, a high error rate on one frequency thus need not render the line unusable: the channel will not be used, merely resulting in reduced throughput on an otherwise functional ADSL connection.

This image shows common DSL interferers:

That's some good info. I didn't know DSL has several channels that it scans through to determine what's the best ones.

I'll check on where the filter is placed and where the modem is in relation to it as well as some of the other noise sources. I wouldn't be surprised if poor quality extensions are used on some of the other phones as well as if it's located close to florescent lighting.

Looking at this page, »gmckinney.blogspot.com/2008/05/a···ats.html it indicates that her levels are pretty good. I'm guessing it may be something that's intermittently causing issues.

thanks for the help, that gives me alot more to go on in troubleshooting this issue.