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Hmm pretty damn awfull speeds

N/A

Hmm pretty damn awfull speeds

What the hell is going on?

From peeking to 5100 on PN speed test 4 days ago im back down to less than 2mb speeds again. Been on maxdsl for about 3 week now and this is about the worst of the worst tonight. Speed is constanly dropping.

I smell sabotage...
19 REPLIES
N/A

Hmm pretty damn awfull speeds

Same probs here.......ho hum Cry
Enkel
Grafter
Posts: 47
Registered: 07-08-2007

Hmm pretty damn awfull speeds

... And here. Synching at 3400, peaked at 2300 now at Ca 750. Before going to Maxdsl I synhed at 1288 at transmitted at Ca 960. Not much of an improvement, I say, bring back fixed speeds!j
N/A

Hmm pretty damn awfull speeds

Count yourself lucky mate.

I'm synching at 8MB nailed on, but my download speed is now 130K.

My existing ticket I raised just says 'check back in two hours' - and it's been like that for 30hrs and counting......

I really wish I hadn't been 'upgraded' now.
N/A

Hmm pretty damn awfull speeds

Alls I can say guys is welcome to the world of Maxdsl.....what a load of rubbish...My router been sync at 8128 for 7 days now....PN stable rate says 7000 and as you guys got a speed test earlier of 776....oh how it feels to be back in the dark ages
N/A

Hmm pretty damn awfull speeds

I managed to fix my problems by adjusting the SNR on my line - i was syncing at 6Mb @ 0.5db - now im syncing at 5Mb @ 7.5db and my connection speed has started to raise also my connection has gone back to fast from interleaved.

Can you check your SNR ratio's

My router used a stupid SNR ratio which would never haved worked - it synced but data throughput was very poor
N/A

Hmm pretty damn awfull speeds

noise margin: 25up 8.5 down
output power: 11up 20 down
atten: 18.5up 29 down
By the way I have a belkin modem router model no:F5D7630
N/A

Hmm pretty damn awfull speeds

salamanzer,

Complete new one to me this, but how on earth did you "Adjust" your SNR ? I was un-aware that we got to choose what SNR we had lol :p

Unless off course you meant you rebooted your router ( or disconnected and reconnected to the net ).

Regards,
N/A

Hmm pretty damn awfull speeds

Hi,

On the cisco range of routers you can change the CPE equipment side of the SNR by setting offsets - thats the only way i could get my line to run correctly.

My SNR was 0.5db i applied a modest offset to get it back up too 7db.

With a bit of testing at my end i have found the SNR is best in the range between 7.5db and 13db under 6db i got packet loss and line drops - over 13db i had packet loss and line drops.

See here

dsl noise-margin 3
dsl gain-setting tx-offset 1
dsl gain-setting rx-offset 1

I can apply offsets and gain settings on this router

ATU-R (DS)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.1 (G.DMT)
ITU STD NUM: 0x01
Vendor ID: 'ALCB'
Vendor Specific: 0x0000
Vendor Country: 0x00
Capacity Used: 100%
Noise Margin: 7.5 dB
Output Power: 20.0 dBm
Attenuation: 47.0 dB
Defect Status: None
Last Fail Code: None
Selftest Result: 0x49
Subfunction: 0x15
Interrupts: 5862 (9 spurious)
Activations: 9
Init FW: ASW_init_3_8_129.bin
Operartion FW: ASW_R3_8_129.bin
SW Version: 3.8.129
FW Version: 0x1A04

with offset

ATU-R (DS)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.1 (G.DMT)
ITU STD NUM: 0x01
Vendor ID: 'ALCB'
Vendor Specific: 0x0000
Vendor Country: 0x00
Capacity Used: 100%
Noise Margin: 2.5 dB
Output Power: 20.0 dBm
Attenuation: 47.0 dB
Defect Status: None
Last Fail Code: None
Selftest Result: 0x49
Subfunction: 0x15
Interrupts: 2158 (6 spurious)
Activations: 9
Init FW: ASW_init_3_8_129.bin
Operartion FW: ASW_R3_8_129.bin
SW Version: 3.8.129
FW Version: 0x1A04

without an offset.

But through my testing i have found between 7.5 and 13db the limits of DSLMax

below 6db = trouble, above 13db=trouble.

That is of course based on my line and distance from the exchange, i was on a max 1Mb line before.

Regards

Sala
N/A

Hmm pretty damn awfull speeds

Similar with me.

I was sync'ing at 6k with an SNR of 5 but re-did my phone wiring and the SNR jumped to 12-14. PN at that time said my stable rate was 2500.

I'm now sync'ing at 8k but PN say my stable rate is 1500 for the last 3 days. SNR is around 12.

Maybe I should cripple my wiring to go to a low SNR again?
N/A

Hmm pretty damn awfull speeds

You can vary the target SNR with a DG834GT (and DG834 etc I guess) by enabling the debug interface and then telnetting to the router.

You can then type:
/usr/sbin/adslctl configure --snr 3

The sync rate will most likely rise a little bit but as said before, you may actually end up with a lower data rate as there will be more errors in the received data.


For what its worth, my download rate has now dropped back to exactly what it was on 2Mb instead of the 4Mb that it was at a few days ago.
Community Veteran
Posts: 26,344
Thanks: 598
Fixes: 8
Registered: 10-04-2007

Hmm pretty damn awfull speeds

I guess when you were fiddling with the wiring you were disconnecting/recconnecting many times to test what was happening. BT will have seen this as your connection being unstable and automatically dropped the MSR. You will need three days of solid connection at higher speeds and then the MSR should go up again.
jelv (a.k.a Spoon Whittler)
   Why I have left Plusnet (warning: long post!)   
Broadband: Andrews & Arnold Home::1 (FTTC 80/20)
Line rental: Pulse 8 Home Line Rental (£13/month)
Mobile: iD mobile (£4/month)
Community Veteran
Posts: 26,344
Thanks: 598
Fixes: 8
Registered: 10-04-2007

Hmm pretty damn awfull speeds

Quote
You can vary the target SNR with a DG834GT (and DG834 etc I guess) by enabling the debug interface and then telnetting to the router.

You can then type:
/usr/sbin/adslctl configure --snr 3


Which goldmine did you find this nugget of information in?
jelv (a.k.a Spoon Whittler)
   Why I have left Plusnet (warning: long post!)   
Broadband: Andrews & Arnold Home::1 (FTTC 80/20)
Line rental: Pulse 8 Home Line Rental (£13/month)
Mobile: iD mobile (£4/month)
shellsong
Grafter
Posts: 2,191
Registered: 03-08-2007

Hmm pretty damn awfull speeds

Quote
You can vary the target SNR with a DG834GT (and DG834 etc I guess) by enabling the debug interface and then telnetting to the router.

You can then type:
/usr/sbin/adslctl configure --snr 3


Are you sure that you aren't just altering the calibration of your router's SNR measurement hardware like the manufacturer might do when testing before delivery? I'm pretty certain that the MaxDSL equipment that BT uses measures the connection statistics itself and doesn't pay any attention to the opinions that your router might hold!
N/A

Hmm pretty damn awfull speeds

surely you can't phsically adjust the SNR on your router?

How will that make the actual signal:noise ratio on your phoneline better?

Fiddling with a setting on your router, even if it is CISCO can't make your line better quality or increase the signal on your line.