Could someone please explain to me what has happened here? My router log shows no change in LA or SNR (the latter sitting between 14 and 13) but there has been a disconnect as shown in the following log:

DSL is available (DSL synchronization exists with 8475/923 kbit/s).
31.03.11 09:12:04 DSL synchronization starting (training).
31.03.11 09:11:39 Internet connection cleared.
31.03.11 09:11:39 Internet connection cleared.
31.03.11 09:11:39 DSL not responding (no DSL synchronization).

A BT Speedtest shows that the IP profile remains at 7150 but the downstream connection speed has decreased from 8864 to 8475 but, conversely, the upstream connection speed has increased from 715 to 730. Is there any significance in the log entry 'DSL synchronization starting(training'?

1. Best Effort Test: -provides background information.

Download Speed
6913 Kbps

0 Kbps 7150 Kbps
Max Achievable Speed

Download speedachieved during the test was - 6913 Kbps
For your connection, the acceptable range of speedsis 2000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :8475 Kbps(DOWN-STREAM), 923 Kbps(UP-STREAM)
IP Profile for your line is - 7150 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 13.97:21.96:64.07 (SBE:NBE:PBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.

The results of this test will vary depending on the way your ISP has decided to use these traffic classes.

2. Upstream Test: -provides background information.

Upload Speed
730 Kbps

0 Kbps 923 Kbps
Max Achievable Speed

>Upload speed achieved during the test was - 730 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 923 Kbps

Thanks.

Nothing has happened. You have a good connection. Your upload/download speeds are appropriate for your sync rates.

In reply to a post by john2007:

Nothing has happened. You have a good connection. Your upload/download speeds are appropriate for your sync rates.

Thanks. What does it mean when it says 'DSL Training' in my router log as I am well out of the 10 day training period?

The DSL training means the ADSL modem is connecting to the exchange nothing to do with the BT 10 day training period, which doesn't train to the line to behave in certain way, the training systems work for the lifetime of the line.

All that is set in semi permanent stone by the end of the 10 days is the MSR figure used for judging connection speed faults. Even this figure can be relearnt.

A further question if I may. Last week, I was getting ADSL disconnects whenever the BT phone rang. I took advice from an Oz forum and I inserted an additional ADSL filter between my filtered faceplate and my router's DECT connection. This solved the disconnection problem and for 3 days my connection has been rock solid at 11955/1083 with an IP of 10000. That said, my CRC error rate at the DSL Exchange (which I assume to mean upstream) was in the order of 12 errors a minute. Overnight, the ADSL connection has re-synchronized at 11827/888 and there are no longer any upstream errors and only a few FECs downstream. There has also been a power reduction on the downstream side of my router which according to the router help section means

'If the communication between the modem and DSLAM is good, for instance because they are located very close to each other, the power can be cut back to reduce the minimum energy requirement and minimize interference in cables in the vicinity.'

My router/ exchange distance is c.0.98Kms and my current line stats are DS SNR/LA 14/15 and US SNR/LA 9/10.

I am sure all of this is positive re line stability. Is this just the DSLAM and the router doing what they are paid to do? If the communication between my router and the DSLAM is so good then why am I not connecting at the BT predicted speed for my line given that I have nothing connected to any of the internal telephone wiring etc?

I am not annoyed just interested to know what might be going on.