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My DSL Profile

Your downstream SNR margin is to low, this is why your modem keeps dropping sync. I would say you need to be adjusted to the 6 meg profile and if that doesn't help maybe 4 meg. Do you have inline filters or are you filtered at the NID? I adjusted a customer yesterday as they were set to a 10 meg profile,but in the DSLAM the highest possible rate was 8 meg. I had to set them to 6meg and everything worked fine after that.

Can you take a look at mine and see what profile it's on? The DSLAM here does 10 meg -- we have 10 meg at the office and it's awesome. My guess is they have me set to 10 when 8 or 6 is the best I can get. I'd like to try 8 though just to see how it does. Thanks!

reply to smitmor
You're obviously set to a 10 meg profile, as it pulled over 11M during one of the re-syncs. But as satcomlink said, it's your noise margin being so low, and your line attenuation being on the high side for that speed, that is hurting your connection stability. Do you have the inline filters on each of your phones? If so, then you really need to look at having a whole house splitter installed. This would send the DSL only to the 1 phone jack where your modem is plugged into, and you wouldn't have to have all those filters plugged into each device. The whole house splitter also (usually) greatly helps improve inside signal stats.

I have filters installed, but I'm having the house re-wired. Where can I get a whole house splitter??

reply to smitmor
Centurytel sells/installs the whole house splitters, or you can buy them online, you just have to be careful and not buy junk.

Are you rewiring your house, or having it done? Make sure that you have at least category 3, twisted pair wire.

reply to smitmor
I adjusted your profile to 8 meg,can you post your stats again for us.

Current Stats:

Transceiver Revision: 5.2.2.0
Vendor ID Code: 4
Line Mode: G.DMT Mode
Data Path: Fast
Transceiver Information Down Stream Path Up Stream Path
DSL Speed (Kbits/Sec) 8128 768
Margin (dB) 8.0 6.0
Line Attenuation (dB) 48.5 22.0
Transmit Power (dBm) 18.9 12.4

So far so good. Thanks!

reply to smitmor
As long as it doesn't dip down below 8, you should be alright. I'd still spring for the whole house splitter though, as it may help stabilize things by a couple more db's.

I talked to a tech from Centurytel and he said he'd come put in a whole-house splitter for me. For the mean time, I "rigged" it by splitting the rest of the house from the dsl signal using a regular splitter and the snr margin went up to 9.5.

Well, it's still acting goofy. Let's try 6.

ADSL Line State: Up
ADSL Startup Attempts: 2
ADSL Modulation: DMT
Datapump Version: DSP 4.2.1.0, HAL 4.2.1.0
Downstream Upstream
---------- ----------
SNR Margin: 8.00 6.00 dB
Line Attenuation: 46.00 23.50 dB
Output Power: 18.92 12.46 dB
Errored Seconds: 0 0
Loss of Signal: 0 0
Loss of Frame: 0 0
CRC Errors: 0 2
Data Rate: 8128 736

Why do you suppose the downstream snr went down so much? It was at 10db when I was on 10 meg...

If it's where you can, try testing at the NID (phone interface) outside by running a long cord from the test jack in the interface, to your modem. Then post the stats here again.

The stats I posted above were done with a homerun from the NID. The rest of the house is disconnected.

If that's the case, then 6 may be your better bet for stability.

reply to smitmor
I have changed your profile to 6 megs. Can you re post yor stats. Thanks..

ADSL Line State: Up
ADSL Startup Attempts: 3
ADSL Modulation: DMT
Datapump Version: DSP 4.2.1.0, HAL 4.2.1.0
Downstream Upstream
---------- ----------
SNR Margin: 12.00 6.00 dB
Line Attenuation: 46.00 23.50 dB
Output Power: 18.91 12.46 dB
Errored Seconds: 0 0
Loss of Signal: 0 0
Loss of Frame: 0 0
CRC Errors: 7 21
Data Rate: 7168 768

Do I need to worry about the upstream margin??

reply to smitmor
Also, can you take a look at your NID, and tell us what kind it is? Post a pic if necessary.

reply to smitmor
No, you don't need to worry about the upstream SNR. The main thing here is the downstream SNR margin.

SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. 6dB is the lowest dB manufactures specify for modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. The higher the number the better for this measurement.
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding

satcomlink,

You may try changing his data path to interleave if it's still on fast path. That usually will add a couple of db increase on the margins.