dynodb
Premium,VIP
join:2004-04-21
Minneapolis, MN
| reply to papaschtroum
Re: Intermittent Disconnects and Lag, Qwest DSL
You could check the FAQ, but because I'm so much more awesome than the FAQ writers, here it goes 
These are the stats I'd mainly look at:
Speed (down/up): 1536 / 736 Kbps
Near End CRC Errors (I/F): 2/0
Far End CRC Errors (I/F): 2/0
Near End RS FEC (I/F): 1224/0
Far End RS FEC (I/F): 2499775/0
SNR Margin (Downstream/Upstream): 6/6
Attenuation (Downstream/Upstream): 63/63
The speed tells you what you're trained at. That he's trained at under the maximum rate of 896 or 1024k says that the modem and DSLAM couldn't connect at a higher rate without the SNR dropping below 6dB.
Errors- near end are those recieved at the modem, far end are those reported by the DSLAM. CRC's are uncorrectable errors, FEC errors are those corrected through interleaving. You'll always see at least a couple of errors, but if they increment heavily, it's likely going to be a problem.
SNR margin- Signal to Noise Ratio margin. This is the SNR above the minimum SNR needed to sustain a certain speed. If it takes 20dB to connect at a given speed, and the actual SNR is 26dB, you will have an SNR margin of 6dB.
6dB is the minimum SNR margin that Qwest DSLAMs are configured to train at. 6dB is marginal but not necessarily a deal-killer. Plenty of people are trained at 6dB with nothing more than some errors that don't cause noticable problems. For others, they will have problems at 6dB. The guideline I'd go by:
6-7dB Marginal. Likely to have errors to some degree, may be an indication of a line problem (house wiring or Qwest cable), but might just mean the signal is weak due to distance from the DSLAM.
8-9dB: OK. You'll probably get some occasional errors, but unless there's a problem of some sort, you should have a pretty stable connection... but if your SNR margin drops much further, you might have problems.
10-12dB: Good. Aside from a few errors here and there, you should have a very stable connection.
13dB and up: Very good. Contrary to the prevailing "more SNR = better" attitude around here, there's really little or no advantage to having an SNR of 30dB compared to 13dB for a given speed unless "bragging rights" counts. Attenuation- In basic terms, it represents the amount of signal resistance on your line between the modem and DSLAM. The higher the attenuation is, the lower the SNR margin will typically be. Longer/thinner cable is the most common reason for increased attenuation, with line trouble a distant second. Once you get into the high 50's or low 60's, you're approaching the limit. At 63dB attenuation (combined with an SNR of 6dB), I'd be a little surprised if he wasn't having problems to some degree.
I'd be more likely to believe this issue is line trouble if just the up or downstream SNR were low, with the other relatively high. While there could be line or house wiring trouble (including a missed filter), my money is on an overly long line... of course, I can only make an educated guess. |
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AthlGrond
Premium,MVM
join:2002-04-25
Aurora, CO
 ·Comcast
1 edit | said by dynodb  :You could check the FAQ, but because I'm so much more awesome than the FAQ writers, here it goes Oh yeah? Well just for that I'm putting this post into the FAQ!
Edit:
See it here (if interested): »US West/Qwest DSL »What are good or bad numbers from the WAN status page? |
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papaschtroum
join:2004-11-22 | reply to dynodb
You *are* awesome.
Thanks! |
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dynodb
Premium,VIP
join:2004-04-21
Minneapolis, MN
| reply to AthlGrond
Cool, I'll try not to let the fame go to my head  |
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disgruntled6
join:2005-10-28
Minneapolis, MN
| reply to Michael78
Quoted text:
"I have had an annoying disconnect problem with my Qwest DSL for the last 9 months."
"This has been happening 2-3 times a night for the last 9 months.. its consistent and Qwest doesn't believe its anything on their side. They say nothing is wrong with the lines."
I, too, have been having problems with Qwest DSL for about 9 months--just like you. Starting around January 2005 the Qwest DSL connection has dropped every time the phone rings. Lately, the DSL drops for no reason at all--several times a day. At least once every 2 hours. My SNR margin right now is low--about 11 - 13 db.
I am in the Twin Cities. I have had Qwest DSL since summer of 2001. In the summer of 2004 I upgraded to the 1.5mb package. I am connected right now at 1024/1536.
Never have I had problems with Qwest DSL other than a few rare disconnects until THIS YEAR. Nothing in my house has changed as far as the wiring is concerned. This is a QWEST issue.
Historically, and even up until a couple of months ago, I've had SNR margins in the high teens to low 20s. The only time it drops is during a lightning storm.
I've also noticed that during the day from 8AM to 5PM (roughly) it can take my DSL up to 30 minutes to train, whereas it always trains up quickly at night.
This is a problem Qwest--NOT with us. I'm paying $45 a month for this DSL and I expect it to work. My connection just dropped and when it came back up I did a Google and found this. It's interesting to see many others are having the same problem. |
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christcorp
Premium
join:2001-05-21
Cheyenne, WY
·Bresnan Online
 ·VOIPo
| If your dsl drops every time the phone rings, there are usually 2 things that cause this.
1; a bad filter in your house. If a filter is bad or missing it can cause the dsl to drop either when the phone rings or if someone picks up the phone with the bad filter.
2; The other reason could be on Qwest's side. It's called a POTS splitter. You have one of these if you have BOTH phone and DSL. It's what sort of combines the 2 together. There are a number of problems that can occur with a bad pots splitter. i.e. DSL works - phone totally dead, Phone works-dsl - totally dead, disconnects, etc...
I suggest that you hook up the dsl modem by itself. DISCONNECT ALL PHONES IN THE HOUSE. Do NOT have anything connected at all except the dsl modem. No filters, phones, directv, digital cable, or anything else in a phone jack. Then when you are up and surfing, take your cell phone and call your house. Technically it should just ring and ring. Unless you have voice mail in which case it will go to voice mail after so many rings. Anyway, see if when the line is ringing in your cell phone if it is dropping you off. If it DOESN'T, then it's probably one of the filters, jacks, or wiring. If it still disconnects, it's probably the POTS splitter with Qwest.
There is a slim chance that it's the modem so if you have a friend with DSL you can borrow their modem and try surfing while calling in also. Later... Mike.... |
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AthlGrond
Premium,MVM
join:2002-04-25
Aurora, CO | Cool more fodder for the FAQ!
See: »US West/Qwest DSL »Why Does My DSL Drop When My Phone Rings? |
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Michael78
join:2005-10-05
Seattle, WA
| reply to Michael78
Wow thanks for all the responses guys! I apologize for not responding... I didnt see any more reply notifications in my email and just thought the thread was over.
As for my problem Im still having issues and im having a tech come out to the house AGAIN tomorrow. Im going to print this out and drill the tech with questions. If they cant figure out why I get DC'd then I switch to cable 
It is funny though that it happens so sporatically.. some times its fine for a week.. and then all of a sudden for 3 nights straight I get latency, DC's and tons of errors reported on the WAN status page.
Qwest is paying for the tech to look at the inside of my home wiring.. they have looked at the DSLAM and said nothings wrong that they can see. |
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wingman99
join:2003-12-18
Bettendorf, IA
 ·Qwest.net
2 edits | Attempt to get them to try things that they have not done If that is possible it could solve the problem.
Trouble shooting is difficult because the time it would take at your house or the DSLAM to find the intermittent problem would probably cost allot more than trying these simple things.
Trying is how they corrected my problem they tried different line bundles, installed a homerun, then switched the line to a different port and switched the pot splitter card at DSLAM that did not work. A week later at the DSLAM they switched to a different card or box altogether problem solved.
The homerun took the most time, i helped with the 15 minuet installation.
At the most my phone and DSL was only down for 10 minuets for the line cuts.
The DSLAM work dsl was down 5 minuets |
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