Billion UK Forum

Hi
I just got my 7800n and am trying to alter the snr just to test if it is stable.
I knocked it down to 3db from 6 and immediately got a sync rate of 2600 approx which is double what i was getting on my old router. (i am on a very long line with 67mb attn)

after a few hours my speed test results shot up to 1.99 mb which is the fastest I have ever had on this line.

strangely though somehow the SNR is going back up all on its own and my sync rate is down to 1760 .
If i tweak the snr down again the sync goes up but over several hours it drifts down again.

from reading lots of forums I thought that this wouldn't happen and that if the line couldn't handle it would just lose sync?

but it seems to be self adjusting somehow. is this correct?

thanks

Mike

It could be due to your ISP's line management if the error count is very high over a very short period. Is the SNRM increased by a fixed amount each time, as this would suggest the line management is knocking back your profile.

Check telnet to see what the stats are showing and have you noticed any browser lag during this fall off period.

With that Atten. you will probably be running G.Dmt which should help stability but as a further check, do you have a NTE5 master socket and if so, have you tried connecting into the test socket which is behind the faceplate. Also are you running wireless or wired and is there any difference on the speed tests between the two.

Are you normally connected to the master cocket as extensions can cause problems.

Can you plug just a corded phone (without mocrofilter) into either the master socket and/or the test socket, dial a single digit and listen for any noise such as hissing or crackling before the auto voice kicks in, as phone line faults can affect broadband.

But to answer your original question.... No.

Tomken wrote:It could be due to your ISP's line management if the error count is very high over a very short period. Is the SNRM increased by a fixed amount each time, as this would suggest the line management is knocking back your profile.

Check telnet to see what the stats are showing and have you noticed any browser lag during this fall off period.

With that Atten. you will probably be running G.Dmt which should help stability but as a further check, do you have a NTE5 master socket and if so, have you tried connecting into the test socket which is behind the faceplate. Also are you running wireless or wired and is there any difference on the speed tests between the two.

Are you normally connected to the master cocket as extensions can cause problems.

Can you plug just a corded phone (without mocrofilter) into either the master socket and/or the test socket, dial a single digit and listen for any noise such as hissing or crackling before the auto voice kicks in, as phone line faults can affect broadband.

But to answer your original question.... No.

Thanks
I cant say browsing is any worse lol it's always slow
yes i have NTE5 master socket and no other circuits connected - bell wire disconnected - yes connected straight to master
not tried wireless on my main computer as it hasn't got it .no crackle on line
telnet stats lots of em lol - will try to attatch em later as a bit short for time

i have had a bad problem this morning though
I have 3 computers a Tablet and a smart phone on the network
my main two computers left on overnight working perfectly
my wifes ethernet connected laptop no connection to the network nor my tablet or smartphone using wireless - tried all the normal things but only a router reboot worked
looks like my billion may be faulty as this never happened ever on my 2 wire router.

it re-connected at 2496 with 3.4db SNR though!

thanks again

Mike

How about posting the router stats.

Before you consider RMAing it, raise a ticket with Billion Support at http://www.billion.uk.com/esupport and you should get an e-mail reply back within one or two days.

My profile is ISP set at 6dB and the SNRM tends to lower, with the only time it seems to recover (sometimes to as high as 8dB) is when the router has been switched off overnight.

This is something I usually do if I've had a rare disconnect on the evening and the sync usually comes good when I switch on in the morning. If it's not quite up to the max I know I can usually get, then I'll reboot it around 10.00am and settle for whatever that gives me.

This is my stats since this morning
sync has stayed at 2496 !

> adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 752 Kbps, Downstream rate = 2720 Kbps
Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 2496 Kbps

Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 3.3 13.0
Attn(dB): 63.5 31.5
Pwr(dBm): 17.0 12.3
G.dmt framing
K: 79(0) 15
R: 12 4
S: 2 4
D: 16 8
Counters
SF: 1319003 1319018
SFErr: 315 45
RS: 44846114 22421300
RSCorr: 200581 204
RSUnCorr: 1969 0

HEC: 256 30
OCD: 1 0
LCD: 0 0
Total Cells: 131994414 0
Data Cells: 1310697 0
Drop Cells: 0
Bit Errors: 0 0

ES: 136 0
SES: 1 0
UAS: 11 11
AS: 22423

INP: 1.12 1.00
PER: 1.75 1.75
delay: 8.00 8.00
OR: 32.00 32.00

Bitswap: 700 9

Total time = 6 hours 13 min 57 sec
FEC: 200581 0
CRC: 315 0
ES: 136 0
SES: 1 0
UAS: 11 11
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 13 min 57 sec
FEC: 11835 0
CRC: 18 0
ES: 13 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 17617 0
CRC: 31 0
ES: 9 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 6 hours 13 min 57 sec
FEC: 200581 0
CRC: 315 0
ES: 136 0
SES: 1 0
UAS: 11 11
LOS: 0 0
LOF: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 6 hours 13 min 43 sec
FEC: 200581 204
CRC: 315 45
ES: 136 0
SES: 1 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
>

Go to the BT speedtest site http://speedtester.bt.com/ and post back the full results.

how do i attach an image please?

oops I found out now

Very interesting.

I never realised that by tweaking the SRNM that you could override the IP Profile like that. I thought the IP Profile was the limiting factor on what speed you could get, but clearly not. Although it is still limiting it to an extent , otherwise on 2.5 you should be getting a bit more on the download.

You will get variations on the SRNM and if you synced at a noisy time , say evening , then as things quieten down the SRNM will increase which is a good thing.

Overall I guess what is happening is that the BT BRAS system (think that's what it is) is slowly correcting the sync speed down to the IP Profile. Looks like any tweaks are temporary until the systems start correcting things.