Hello,

on my Draytek 2600G, the download speed of the connection is very stable and what is advertised by the ISP, however upload speed is not stable at all. If in telnet session I issue adsl reboot several times, every time Up Speed will be different, jumping from 128K to 512K. SNR margin changes between 15 and 23. Loop attenuation is about 14. Changing adsl psd has very big effect, but even with the optimal setting, the connection is still unstable

What could be causing this? what other parameters to try?

When I tried another DSL modem, it connected at 512K at all times.

> show adsl

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ATU-R Info (annex A)

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Running Mode : T1.413 State : SHOWTIME
DS Actual Rate : 3008000 bps US Actual Rate : 320000 bps
DS maximum Rate : 5952000 bps US maximum Rate : 384000 bps
DS Path Mode : Fast US Path Mode : Fast
NE Current Attenuation : 14.5 dB Cur SNR Margin : 19.5 dB
DS actual PSDM(C) : 00000005 US actual PSDM(R) : 00001f4d
ADSL Firmware Version : 42e2ea53

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ATU-C Info

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Far Current Attenuation : 17.0 dB Far SNR Margin : 7.0 dB
CO ITU Version[0] : 00000000 CO ITU Version[1] : 00000000
DSLAM CHIPSET VENDOR : < Unknown >

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INTL, DSTREAM bytes/depth= 1, symbols/codewords = 0, latency= 0*0.25ms.
, USTREAM bytes/depth= 1, symbols/codewords = 0, latency= 0*0.25ms.
CODE, DSTREAM fast parity bytes= 0, fast codeword= 95.
DSTREAM intl parity bytes= 0, intl codeword= 0.
CODE, USTREAM fast parity bytes= 0, fast codeword= 11.
USTREAM intl parity bytes= 0, intl codeword= 0.
Setting>>
FDQ : Enable, TCM : Enable, EC : Disable, Framing Mode : 3.
Running>>
FDQ : In Use, TCM : In Use, EC : Off.
DS : Framing Mode 3, US : Framing Mode 3.
ADI ADSL Firmware Version: 42e2ea53
>