Odds & ends.
A few odds and ends remaining to report. Several users posted about problems with SNR dropping at night and causing retrains. A speed that during the day gave an SNR margin of 6 dB would not be sustainable in the evening and a resync to a lower speed would occur, possibly several such retrains if the noise got progressively worse.
In answer to the question "Does your SNR / noise margin and/or modem sync speed vary a lot, for example between night and day." the response was :-
Don''t know / haven''t noticed 27%
Variations are small 54%
Slower speeds at night 16%
Faster speeds at night 2%
so for 81% of respondents the variability isn't a big problem. 16% see the behaviour described above and 2% see the reverse.
On the upstream front there are far fewer issues than downstream. The 448k sync speed of the Home version of MaxDSL is not especially ambitious and it is therefore not a suprise that 88% of respondents have no upstream issues at all. 9% reported upstream speed problems, and 2% had issues with errors or stability.
Since the survey was done BT have temporarily withdrawn their bulk upgrade tool to fix some issues with stuck BRAS profiles etc. Another glitch to be acknowledged was that the DLM process would not raise the target SNR margin to a level where the downstream rate fell below the fault reporting rate (FTR) which is itself set at 70% of the MSR recorded during the 10 day training period. This prevented the DLM stabilising a line that had fallen more than 30% in speed from its original stable rate. The latter problem is reportedly fixed and the bulk upgrade process is due to restart on 06/06/06.
Zen Internet's Technical Support Manager recently posted that "Despite all of the above the actual increase in fault rate we've seen hasn't been significant, particularly given the volume of regrades and new activations we've seen."
My office line went Max today, full 8132/832 sync speed. I had a 2M rate limit until I left the router off for 30 minutes while I was out for lunch, on return it was running with download rates around 2.3 times that of the 2M fixed speed service.
In answer to the question "Does your SNR / noise margin and/or modem sync speed vary a lot, for example between night and day." the response was :-
Don''t know / haven''t noticed 27%
Variations are small 54%
Slower speeds at night 16%
Faster speeds at night 2%
so for 81% of respondents the variability isn't a big problem. 16% see the behaviour described above and 2% see the reverse.
On the upstream front there are far fewer issues than downstream. The 448k sync speed of the Home version of MaxDSL is not especially ambitious and it is therefore not a suprise that 88% of respondents have no upstream issues at all. 9% reported upstream speed problems, and 2% had issues with errors or stability.
Since the survey was done BT have temporarily withdrawn their bulk upgrade tool to fix some issues with stuck BRAS profiles etc. Another glitch to be acknowledged was that the DLM process would not raise the target SNR margin to a level where the downstream rate fell below the fault reporting rate (FTR) which is itself set at 70% of the MSR recorded during the 10 day training period. This prevented the DLM stabilising a line that had fallen more than 30% in speed from its original stable rate. The latter problem is reportedly fixed and the bulk upgrade process is due to restart on 06/06/06.
Zen Internet's Technical Support Manager recently posted that "Despite all of the above the actual increase in fault rate we've seen hasn't been significant, particularly given the volume of regrades and new activations we've seen."
My office line went Max today, full 8132/832 sync speed. I had a 2M rate limit until I left the router off for 30 minutes while I was out for lunch, on return it was running with download rates around 2.3 times that of the 2M fixed speed service.
posted by PhilT at 3:57 PM
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