[Line Problem] Declining sync speed, increased SNR, something ch
I've long had mediocre sync on my DSL line - on 3008/512 service, it would typically sync between 2200 and 2800. Power cycling the modem (Speedstream 4100B) would help for a while, then after a couple of days it would drop and re-sync at a lower speed. Or, if it rained, the connection would fail entirely.
Since a few days ago, the sync speed has been terrible - not above 2000 (right now it's at 1632). It also takes a really long time to sync - a minute or two or 5 minutes one time. (Attn is about 40).
I've noticed at the same time, the SNR numbers on the modem have been much higher. Before, it would sync with a margin around 6.0 - 7.0, then resync if it dropped below that. Lately, it's more like 14 or 15, very consistently.
I've checked with two different modems and get the same result. It's homerun Cat5 wiring from the NID with nothing else connected to the line.
I'm wondering if this indicates something changed at AT&T's end? If it was simply the physical line deteriorating (it's always had weather issues), wouldn't you expect that both the sync speed and SNR would decline?
I found a really old thread that mentioned DSLAM power being reduced, could this be the problem?
Is there anything that one of the techs at the Direct forum could from their end to check the line?
Re: [Line Problem] Declining sync speed, increased SNR, somethin
If the modem was forced to sync at slower sync speed, the "excess" unused noise margin would be reported as a higher SNR. You would also see this increase in SNR if your line's profile was lowered to the 1536 sync speed.
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|reply to DavidEBSmith |
Having SNR at 6.0 dB to 7.0 dB on a line with 40 dB attenuation indicates possible bad wiring. I saw this with a friend, who cleaned up her premises wiring for a significant improvement in the SNR.
If you can, check the stats at the NID. If they are the same, it is a plant problem which will require AT&T to fix. If they are much improved, check your premises wiring.
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