Re: Changes in router stats - what happened?
- From: Invalid <news@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 31 Mar 2007 10:57:07 +0100
In message <310320070923598696%kitzyme@xxxxxxxxx>, Kit <kitzyme@xxxxxxxxx> writes
Yes its related to the power cut. When the power came back, the router restarted and negotiated a speed setting with the exchange.
This questions probably shows my basic lack of understanding of ADSL...
On Monday my router stats were:
Attainable line rate : 9752 kbit/sec
Attainable Atm rate : 8672 kbit/sec
Used line rate : 8600 kbit/sec
Fast used Atm rate : 0 kbit/sec
Interleaved used Atm rate : 7616 kbits/sec
Rel. capacity occupation : 88
Noise Margin : 10 dB
Line attenuation : 22 dB
Output Power : 19 dBm
currently they are:
Attainable line rate : 8152 kbit/sec
Attainable Atm rate : 7168 kbit/sec
Used line rate : 7476 kbit/sec
Fast used Atm rate : 0 kbit/sec
Interleaved used Atm rate : 6560 kbits/sec
Rel. capacity occupation : 92
Noise Margin : 13 dB
Line attenuation : 22 dB
Output Power : 19 dBm
I thought that an increased Noise Margin was a good thing, so why does
it (apparently) go with a decreased Attainable line rate?
Could it be related to a power cut that we had here in between taking
the above two stats?
Thanks,
Kit
A lower speed will always produce a better noise margin (for a given set of line conditions) so ADSLMax adjusts the speed upwards until the noise margin comes down to a preset value (normally about 6db). Noise margins vary depending on external conditions, interference etc. If the noise margin drops too low, the modem disconnects and then reconnects at a lower rate. The idea is that the system attempts to find a stable speed that still works when the noise conditions on your particular line are at their worst.
Try switching the router of for a minute or so, then switching it back on. It may reconnect at the slightly higher speed (with a lower noise margin) - OTOH it might go lower.
Mine usually reconnects after a reboot at about 6800, but will then drift down over the next few days (with losses of sync occasionally logged) to about 6000. That's the Max stable speed.
--
Peter R Cook
.
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