I replaced my aging 2820Vn with a 2860Vac and now my ADSL uplink speed is 50% worse !!

I am running the recommended code 3.8.4.6_BT.
I tried both DSL modem Code firmwares AnnexA_576D17_572801 and AnnexA_574307_571801, same speed.
Also local Attenuation reading has gone up from 18db to 23dB. I am using all the same cables.
The FAR SNR is super high 24db and that is probably causing my slow upstream speed.

Anybody any ideas on this ? or as it is an FFTC modem does nobody test this ADSL2+ mode much ?

Should I raise a ticket with Draytek ?

Cheers smiler

Here are some outputs from 'show adsl' from the 2820 and 2860 respectively...



> show adsl 5/10/2017 - back to fast mode.. better uplink speed

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ATU-R Info (hw: annex A, f/w: annex A)

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Running Mode : ADSL2+(G.992.5) State : SHOWTIME
DS Actual Rate : 20568664 bps US Actual Rate : 1235815 bps
DS Attainable Rate : 20844000 bps US Attainable Rate : 1236000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 18 dB Cur SNR Margin : 3 dB
DS actual PSD : 20. 1 dB US actual PSD : 12. 4 dB
ADSL Firmware Version : 2471201_A

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ATU-C Info

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Far Current Attenuation : 10 dB Far SNR Margin : 6 dB
CO ITU Version[0] : 00004946 CO ITU Version[1] : 0000544e
DSLAM CHIPSET VENDOR : < IFTN >

.... 2860Vac Show adsl on next post >>>

with the new 2860Vac >>>>
> show adsl on the new 2860Vac - FAR SNR is super high 24db and low upstream speed

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ATU-R Info (hw: annex A, f/w: annex A)

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Running Mode : ADSL2+ Annex A State : SHOWTIME
DS Actual Rate : 19633000 bps US Actual Rate : 443000 bps
DS Attainable Rate : 19788000 bps US Attainable Rate : 1044000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 23 dB Cur SNR Margin : 2 dB
DS actual PSD : 20. 1 dB US actual PSD : 10. 5 dB
NE Rcvd Cells : 682933 NE Xmitted Cells : 65931
NE CRC Count : 71 FE CRC Count : 0
NE ES Count : 60 FE ES Count : 0
Xdsl Reset Times : 0 Xdsl Link Times : 1
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
ADSL Firmware Version : 05-07-02-08-00-01
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE

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ATU-C Info

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Far Current Attenuation : 10 dB Far SNR Margin : 24 dB
CO ITU Version[0] : b5004946 CO ITU Version[1] : 544e71c8
DSLAM CHIPSET VENDOR : < IFTN >

Try using the Non Vector firmware , you have no use for vectoring on that line .

I use a Vigor 130 and the "BT" firmware is useless , it causes continual line drops/session disconnects and on an ECI street cabinet G.INP and Vectoring are not going to happen. Changing to the alternative firmware (non vector) sees a dramatic improvement in performance and stability.

Others have also found changing to non vector has cured problems.

I just tried the non-vectoring firmware version 3.8.4.6_STD and it is the same. Got a bit more uplink speed, now 440kb/s .

As my line is not yet FFTC, just plain ADSL2+ I am not sure vectoring is in the game... but thanks for the idea..

Strange how downlink speed is so very close to max attainable, which ok.
Upstream max attainable is over 1000kb/s (more like it!) and I only get 440kb/s after last reboot, but far 25db SNR .. too big!

My feeling is a firmware pb. I will see if Draytek respond, they are normally very good, had all their routers post 2600we days
which is stil runing fine at a friend's house.

Any other ideas ??

Cheers

Dratek support said leave it with firmware 3.8.5.BT and after a week of so, and a few reboots, router is back to normal speed up and down..... very strange indeed...
Thx to Draytek support

Cheers Smiler