I bet the 15db attenuation is wrong also, the 30 odd dB upstream would seem to equate to the kind of speeds he was seeing. I would have thought it's his router which is at fault.

Yep, a few routers tend to show 15.5dB sometimes, a reboot will clear it.

That does sound plausible. Normally the DS attenuation is about double the upstream.

I have just gone onto www.speedtester.bt.com and got the following results:-



Test1 comprises of Best Effort Test:
IP profile for your line is - 500 kbps
DSL connection rate: 448 kbps(UP-STREAM) 2176 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 458 kbps

If you wish to discuss these results please contact your ISP.

If you are experiencing problems with specific applications, servers or websites please contact your ISP for assistance.

Your test has completed please close this window to exit the performance tester.

My router is presnetly showing:-

Line Mode G.DMT Line State Show Time
Latency Type Interleave Line Up Time 00:07:36:14
Line Coding Trellis On Line Up Count 1

Statistics Downstream Upstream
Line Rate 2176 Kbps 448 Kbps
Noise Margin 11.6 dB 17.0 dB
Line Attenuation 15.5 dB 31.5 dB
Output Power 17.5 dBm 12.3 dBm
K (number of bytes in DMT frame) 69 15
R (number of check bytes in RS code word) 16 16
S (RS code word size in DMT frame) 2 8
D (interleaver depth) 16 4
Super Frames 1610202 1610200
Super Frame Errors 23 0
RS Words 54746872 13686700
RS Correctable Errors 10799 6
RS Uncorrectable Errors 105 0
HEC Errors 20 0
OCD Errors 0 0
LCD Errors 0 0
ES Errors 0 0

ADSL BER Test - Result

The ADSL BER test completed successfully.


Tested Time 20
Total Transferred Bits 39414528
Total Error Bits 0
Error Ratio 0.00e+00

Does that help explain anything. REally sorry for all the niave questions but i haven't a clue with all this. Just know my speed has dropeed from nearly 2 down to 0.5 in the last month.

IP profile for your line is - 500 kbps
DSL connection rate: 448 kbps(UP-STREAM) 2176 kbps(DOWN-STREAM)

you now have to wait and see if you can keep the sync speed over 1800 in which case the IP Profile will rise to 1.5M in ~3 days. Its nearly at 2M, but not quite.

The BER test shows no errors, which is good.

Interference and/or wiring at your end led to a sync speed below 1152 hence the 512k profile.