Gentlefolk,
I've been puzzling over the performance of the 2Wire on one of our un-favorite long lines which seems to behave in an erratic way. The picture shows two distinct patterns which have been swapping for several months.
I'd really like to solve the underlying problem but as the line test says no fault found and the JDSU broadband tester only syncs at around 500 the chances of getting BT to investigate look very slim.
The resyncs on 19 Oct show much higher downstream starting rate speeds but a very bad final rate, lower upstream rates, higher noise margin and many drops in the day.
The starting and final downstream noise margins remain high.
There are no FECs.
There is no Inpulse Noise and a delay of latency of 0.25 ms
Most drops report Loss Of Signal errors.
Then there are long stable periods of over 3 days, 2 days, 2 days, 1 day, 3 fails in 1 day, 2 days and finally up to "time now" 2 days.
During these periods there is a lower starting rate speed and similar final rate speeds, there are FECs and CRCs, fluctuating downstream start and final noise margins, slightly higher downstream power and higher upstream rate.
There is impulse noise and a higher delay of latency of 8.00 ms.
There are 4 Loss of Frame Errors as well as Loss of Signal errors.
QLT at the moment is almost silent but there are periods of electric fence ticking, although I haven't had the opportunity to test whether that is the root cause of the problem.
Ring back test seems to have no effect at all.
Can anybody offer any suggestions as to whether these observations are caused by differing line conditions or whether DLM (or DSLAM ?) is taking a hand as well.
If there are any real wizards who could predict how to solve the performance issues we would be absolutely delighted.
Kind regards,
Walter
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