bbplumber
join:2009-01-14
Mission Viejo, CA
| reply to sashwa
Re: Digitel - High number of TX errors
Sashwa,
Was the info I provided sufficient?
Just trying to learn what a TX error is on a DSL line.
In the DSL spec, is there a mechanism where the receiving equipment tells the sender that it's sending garbage?
I would figure that if a modem knew it was going to transmit an error it probably wouldn't transmit it in the first place. In my past experience, I've seen queueing errors when a buffer was overflown, but in this case I see no TX drops, which is typically where such errors would be reflected.
Anyway, just looking for some DSL knowledge.
Thanks,
Chris |
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sashwa
Pixie Cat Crunchin' n Foldin'
Premium,Mod
join:2001-01-29
Alcatraz
clubs: 
 ·Comcast
·Alameda Power & Te..
Host:
Broadband Modem (H..
MSN
DSL Extreme
Windstream
Southeast Asian Br..
| I think so but I'm not sure. This is a slow forum so it may take a while before someone comes around with help.
I'll check around to see if there might be a better forum to help you out.
Do you have access to her computer or are you here in CA? What is her OS?
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TH ~ NE ~ EPN ~ NC ~ TD |
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bbplumber
join:2009-01-14
Mission Viejo, CA
| I use logmein to get into it. She's running OSX 10.5.6
I seriously doubt the issue is with her PC though. The extreme variability in that first hop is what concerns me most.
Her provider is running 1483. I forgot to check how big of a subnet they have her on though. No idea what they are using for the DSLAM.
Thanks |
|
sashwa
Pixie Cat Crunchin' n Foldin'
Premium,Mod
join:2001-01-29
Alcatraz
clubs:
·Comcast
·Alameda Power & Te..
Host:
Broadband Modem (H..
MSN
DSL Extreme
Windstream
Southeast Asian Br..
1 edit | 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:
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TH ~ NE ~ EPN ~ NC ~ TD |
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bbplumber
join:2009-01-14
Mission Viejo, CA
| 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. |
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