Connection Drops
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Connection Drops
28-07-2011 6:49 PM
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My parents are having some problems with connection drops. Their exchange has been upgraded to ADSL2+ and
their line appears to have been upgraded. This would be fine if it worked (more speed!) but their connection keeps dropping, usually after about 13 minutes, and they have to reboot the modem to continue. By logging in to the modem I can do a soft reboot every time the connection fails, but they have to power it off/on.
I have raised a ticket, and plusnet got interleaving turned on. I have also tidied up some wiring which may have helped. One or other of these changes seems to have moved the SNR from about 11 to about 18.
They have a Tenda WBR-T2 modem which is on the list at http://community.plus.net/library/hardware/adsl2-hardware/ as being ok for adsl2+
Using telnet to get the stats gives:
ADSL Link Info
adsl: ADSL driver and PHY status
Status: Showtime Channel: FAST, Upstream rate = 440 Kbps, Downstream rate = 9727 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 17.8 31.6
Attn(dB): 35.5 13.7
Pwr(dBm): 0.0 12.3
Max(Kbps): 19432 888
Rate (Kbps): 9727 440
G.dmt framing
K: 127(0) 56
R: 16 8
S: 1 1
😧 96 8
ADSL2 framing
MSGc: 71 12
B: 126 55
M: 1 1
T: 2 1
R: 16 8
S: 0.4161 4.0000
L: 2749 128
😧 96 8
Counters
SF: 2190 2188
SFErr: 0 32
RS: 337322 148784
RSCorr: 0 0
RSUnCorr: 0 0
HEC: 0 7
OCD: 0 0
LCD: 0 0
Total Cells: 810849 317136
Data Cells: 60 1018
Drop Cells: 0
Bit Errors: 0 186
ES: 0 0
SES: 0 0
UAS: 33 61
Any thoughts on what to try now? (and anyone know what Pwr is?)
plusnet's latest reply said "the router you are using is an ADSL and not ADSL2 router" which seems plain wrong, the stats say "Mode: ADSL2+".
If buying a new router is the thing to try, any suggestions on make/model? (I meant to bring mine with me to try when I came to visit but I forgot - my bad.)
Thanks for any suggestions
Re: Connection Drops
28-07-2011 7:30 PM
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Re: Connection Drops
28-07-2011 7:53 PM
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Jan 1 00:00:30 user crit kernel: ADSL G.992 message exchange
Jan 1 00:00:31 user crit kernel: ADSL link down
Jan 1 00:00:36 user crit kernel: ADSL G.994 training
Jan 1 00:00:43 user crit kernel: ADSL G.992 started
Jan 1 00:00:47 user crit kernel: ADSL G.992 channel analysis
Jan 1 00:00:54 user crit kernel: ADSL G.992 message exchange
Jan 1 00:00:54 user crit kernel: ADSL link up, interleaved, us=440, ds=9727
Jan 1 00:00:55 user debug syslog: iptables -t nat -A PREROUTING -i br0 -d 192.168.0.1 -p udp --dport 53 -j DNAT --to 128.9.0.107
Jan 1 00:00:55 daemon notice pppd[667]: PPP: Start to connect ...
Jan 1 00:00:55 daemon crit pppd[667]: PPP server detected.
Jan 1 00:00:56 daemon crit pppd[667]: PPP session established.
Jan 1 00:00:56 daemon crit pppd[667]: PPP LCP UP.
Jan 1 00:00:57 daemon crit pppd[667]: PPP LCP UP.
Jan 1 00:00:57 daemon crit pppd[667]: Received valid IP address from server. Connection UP.
So I'm not sure if interleaving is on or off. I'll try and be patient and see if anything else changes in the next day or so ...
Re: Connection Drops
29-07-2011 2:48 PM
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Interleaving is showing as 'opt-in', which should mean it's turned on. However run mode is showing as fastpath not interleaved.
I'll ask one of our faults guys to take a look.
Re: Connection Drops
29-07-2011 4:03 PM
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Quote from: buylow ... I've turned logging on ...
It might be a good idea to set the correct time on the router, then you'll know when the logged events really happened.
Re: Connection Drops
29-07-2011 5:01 PM
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Quote from: Chris I *think* I've found the right account, and just performed a quick check on the line and it's confused me too.
Interleaving is showing as 'opt-in', which should mean it's turned on. However run mode is showing as fastpath not interleaved.
I'll ask one of our faults guys to take a look.
Thanks Chris, see ticket 44701111
We bought another modem (Linksys WAG160N) today to see how that handled the line and it seems slightly better. I noticed the connection was down earlier but it came back up by itself with this modem. If the line is glitchy for some reason clearly it's better if the modem recovers by itself instead of us having to reboot it. I'm only here for a couple more days so I'd like to get it fixed by then if possible. Also if I get called to do remote support I need this line for VPN access to work so I've been trying to fix it asap.
Re: Connection Drops
30-07-2011 8:56 AM
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Quote from: ReedRichards It might be a good idea to set the correct time on the router, then you'll know when the logged events really happened.
I don't know if it's possible to set the time on that router, the logs show that it gets the time from the internet fairly quickly when it is starting up. The messages I quoted were from before it had found the time, so it still showed Jan 1. Got a different modem now, so won't worry about this.
Re: Connection Drops
30-07-2011 8:58 AM
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Quote from: Chris I'll ask one of our faults guys to take a look.
<bump>
Be interested to know what they found ...
(New modem doesn't seem to show any interleaving status, so I can't see anything from here)
Re: Connection Drops
30-07-2011 9:37 AM
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Quote from: buylow We bought another modem (Linksys WAG160N)
I hope it lasts. I find Linksys routers can be short-lived.
Quote from: buylow If the line is glitchy for some reason clearly it's better if the modem recovers by itself instead of us having to reboot it.
All routers that are working properly should re-establish a dropped connection. Your old one was faulty.
Re: Connection Drops
01-08-2011 1:26 PM
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I can see from the connection logs that the line is a lot more stable now. Either the old router was faulty or there was an idle timeout set on the other one (which I would have suspected, seeing that a lot of the disconnections were exactly 14 minutes)
Are things better now then?
Jojo
Re: Connection Drops
01-08-2011 10:58 PM
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Seems good now anyway, thanks for asking. As you say, I guess the old modem was faulty.
So is interleaving on or off now from what you can see?
And what is the situation regarding line speed? From my (limited) understanding of the numbers, they could perhaps get a fair increase in speed although they don't have any large need for it. Will the line adapt by itself, or will it stay at the current speed unless something is changed at the bt/plusnet end?
Reliability is the main priority, so leaving it at the current speed is ok ...
dick:quote
Re: Connection Drops
02-08-2011 2:08 PM
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The downstream is on fast path, so interleaving is off at the moment. As for the speed. The line is currently banded at 4M-9M so the maximum sync rate will be 9728Kbps. Currently the line is syncing at 9726Kbps, so it is performing at its optimum now. Before I suggest turning off the banding to get a better speed can I confirm that they are plugged into the master/test socket with no extensions between the socket and the router.
Jojo
Re: Connection Drops
02-08-2011 3:10 PM
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Quote from: Joanne The downstream is on fast path, so interleaving is off at the moment. As for the speed. The line is currently banded at 4M-9M so the maximum sync rate will be 9728Kbps. Currently the line is syncing at 9726Kbps, so it is performing at its optimum now. Before I suggest turning off the banding to get a better speed can I confirm that they are plugged into the master/test socket with no extensions between the socket and the router.
Ok, I thought interleaving was turned on earlier, but then there was some confusion over whether it was on or off.
No, they're back to their "normal" setup with the modem in their usual socket. I think the stats are broadly similar anyway (e.g. SNR about 17 from memory).
Should they do this before you turn banding off? It seems like this would give a false impression of the line conditions? So it might change to some high sync rate, and then when they change back to the normal socket maybe it can't handle that high rate?? (probably trying to understand too much instead of just doing what you say, sorry.) Is there a downside to just turning the banding off with the current connection setup?
Thanks for the help, btw. I went and read some FAQs after my last post and learnt about DLM and banding, should have done that first.
Do you have any thoughts on whether they're likely to see improved speeds? If they're only likely to see a smallish improvement and the line ends up banded again at a similar rate then maybe it's not worth the effort. On the other hand, if they're likely to get a good increase, maybe a 50% or 100% better rate, then maybe that's worth going for ...
Re: Connection Drops
02-08-2011 4:28 PM
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it's a fair point you have about the set up that they have. The thing is, do they need more speed? If not, then I would say leave it as it is. I'd say the line, in perfect condition, would be capable of 12-13000Kbps
About the test socket; it's a catch 22. In most cases (not all the time, of course) it will be internal wiring that will cause banding like this. I could remove the banding as it is, but I'd much rather remove it while it's in the test socket, as this will indicate a problem outside the property if it were to be banded again.
Jojo
Re: Connection Drops
03-08-2011 9:39 PM
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Ok, thanks for the comments. We'll leave it as it is, it ain't broke now so why fix it!
Thanks again for your help.
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