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Posted by LouB on April 2, 2008, 4:34 pm
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Jon.R.Kibler@gmail.com wrote:
> Hi,
>
> We have been having an on-going battle with several local telcos over
> DSL line quality. For some reason their testers always show a much
> higher line quality than does the routers.
>
> For example, I have taken the exact same DSL POTS cable, and plugged
> it into a Cisco 827, 837, and 877 router and got essentially the same
> line quality stats. When the local telco test the line (usually using
> a SunSet MTT test set), they consistently see a good quality line,
> where the routers see a marginal line -- one that keeps dropping. (And
> this is not just a single line at a single location -- we have the
> same problem at multiple locations, and at some locations, on multiple
> lines at that location.)
>
> For example, here is what the router reports:
> ATU-R (DS) ATU-C (US)
> Capacity Used: 98% 53%
> Noise Margin: 5.0 dB 12.0 dB
> Output Power: 17.0 dBm 8.0 dBm
> Attenuation: 64.0 dB 31.5 dB
> Interleave Fast
> Interleave Fast
> Speed (kbps): 1216 0
> 256 0
>
> and the test set reports:
>
> Capacity: 47% / 40%
> SNR: 8.5dB / 15dB
> Attenuation: 40dB / 28dB
> kbps: 1472 / 256 (noise profile)
>
> Why such a substantial disagreement between telco test sets and Cisco
> routers? Especially when there is no difference between the wiring to
> the device, up to and including the cable plugged into the device.
>
> This is getting to be a real pain. We have flaky connections and
> numerous drops, yet the telco says everything is fantastic. It just
> doesn't make sense.
>
> TIA for any insights into this problem.
>
> Jon K.
The telcos are lying to save money. Escalate the complaint.
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