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Stable rate stuck on 500

N/A

Stable rate stuck on 500

Hi,

I've had Max now for a total of 10 days. Originally my stable rate was 2500 and my router synced at ~4000 normally. Then 2 days later the stable rate was down to 500. I then had 3 weeks of no connection due to BT messing up and ceasing my ADSL connection. Eventually BT fix it and it was back to how it was. I've now had 6 further days but the stable rate has remained on 500.

Interleaving was turned on about day 3 or 4. Now the router normally syncs at ~3500 with SNR of ~10db. I've reconnected my router at least once a day for 6 days as suggested but the stable does not increase. Is this a fault that I need to raise or should I keep waiting.

I think there was one or two occasions when it synced at 224 but I immediately rebooted and it resynced at about 3500.

Normal speedtests do show download speeds of 500kbps as I'd expect. However if I try the BT speedtest logging in as speedtest@speedtest_domain I get about 2000kbps.

Is it worth raising a question to Plusnet asking if there have received a profile from BT yet?

Regards,
Tim
11 REPLIES
daveyb
Grafter
Posts: 128
Registered: 04-08-2007

Stable rate stuck on 500

Hi Tim,

It might be those few, brief occasions of low sync (224kbps is very low though) as this will reset the 3 days of higher stable syncs that you apparently need to get your bRAS profile raised.

Unfortunately, it seems you need 3 days with absolutely no drops in sync if you are trying to get a higher profile.

Sorry, David.
N/A

Stable rate stuck on 500

Thanks for the reply David,

I did wonder about the low syncs but I'm fairly sure I've had at least 3 days now where the sync hasn't dropped below 2200. It's strange as normally it averages 3500 when I sync during the day. I leave the router on all the time and every morning when I check the sync it tends to have dropped to between 2200-2700 although I haven't lost sync during the night. The sync speed doesn't increase automatically unless I reboot the router and then it syncs at 3500 again. If the sync can drop automatically during the night why wouldn't it increase automatically when it clearly capable of it.

Regards,
Tim
daveyb
Grafter
Posts: 128
Registered: 04-08-2007

Stable rate stuck on 500

From what I understand on initial connection your router and the exchange negotiate a sync rate (in your case 3500kbps). However, if during the day this proves to be too high (too many errors, dropped packets, or whatever) then they gradually reduce the rate. I think the reason it doesn't increase back up again is that it is assumed that the reduction in speed has been done to increase stability and reduce errors and so it's reasoned to be better to leave it at where it's naturally come to rest, as it were.

However, if you disconnect the session and then reconnect you're starting again from scratch, so it will go through the same process of sync at the fastest the router/exchange can negotiate and then gradually drop during the day as a result of errors until it finds it's natural level again.

There've been threads in other boards that have asked if it's not possible to influence the initial negotiation with the router (I think some Draytek's allow you to either specify a lower sync speed or set a higher target SNR to reduce sync speed) so that the router/exchange initially sync much nearer the natural stable speed.

My router does that same (at least it used to!) and usually starts at 2470kbps and ends up around 2270kbps.

David.
lunarjetman
Grafter
Posts: 59
Registered: 31-07-2007

Stable rate stuck on 500

So it's possible then for the sync rate to change other than at the time of a full re-connect?

My sync rate is rarely the same two days in a row and I just assumed that meant that everynight I'm having to re-sync at some point. The logs on my Linksys WAG54G don't seem to want to tell me whether the DSL connection has been lost.
daveyb
Grafter
Posts: 128
Registered: 04-08-2007

Stable rate stuck on 500

I guess it depends on what you define as full re-connect but in my router logs I have entries like:

Fri, 2006-05-12 12:55:49 - Initialize LCP.
Fri, 2006-05-12 12:55:49 - LCP is allowed to come up.
Fri, 2006-05-12 12:55:53 - CHAP authentication success

which must be when the router/exchange are reducing sync speed (the router is a Netgear DG834G) as I'm not initiating a disconnect (although this produces exactly the same info in the logs so there's no easy way to tell the difference).

David.
N/A

Stable rate stuck on 500

My router is a Netgear DG834PN and I'm not aware of any way to influence the sync speed or SNR. It seems a really good wireless router but I am disappointed by the lack of detailed stats compared to other routers even much older ones.

It has the usual D/U sync, line atten. and SNR but for other count stats theres only TxPkts, RxPkts, Collisions, Tx B/s, Rx B/s and uptime for each port. It doesn't show any counts of errors etc unless I'm missing something. It doesn't even show if it's on fast or interleaved. I also have an old Voyager 205 which I don't want to use as it's not wireless but it does have a lot better stats.

Anyway, the sync does not seem to change from 9am to 6pm but must drop sometime in the evening or night. So I don't think it's a gradual decrease in sync during the day due to errors. Unless I suddenly get loads of errors late evening/early morning which reduces the sync. I wish I could see this in my router stats.

Either way even if my natural sync is around 2272 I should still have a stable rate of 2000 shouldn't I. It should increase from 500.

Tim
daveyb
Grafter
Posts: 128
Registered: 04-08-2007

Stable rate stuck on 500

Hi Tim,

It depends on whether there are any very low drops in your sync speed. As I understand it any drops (even temporary ones) usually affect your bRAS profile rate within 75 minutes (so a temporary drop to below 1000kbps, which is what happened to me drops you straight down to 500kbps on PlusNets "stable_rate"). However, to climb back up you need, AFAIK, 3 days of good sync. Any drop, even temporary, during your 3 day stint and you back to the beginning again.

As to router stats I don't know how simiar the firmware is between the DG834G and the DG834PN but you could try the following;

http://<router-ip-addy>/setup.cgi?todo=debug

then telnet into your router and at the # prompt

cat /proc/avalanche/avsar_modem_stats

and you'll see various entries for upstream/downstream interleave path stats and fast path stats. If you've no fast path and only interleave stats then interleaving is on.

David.
N/A

Stable rate stuck on 500

Thanks for that. I've been wondering if there was a way to telnet to the router. I didn't realise it would be whole shell environment. On my router it's BusyBox v1.00 (2005.07.29-07:22+0000) Built-in shell (ash). It's Linux version 2.6.8.1.

I guess it's a different version that you've got as that stats file does not exist on mine. I must be in different location. I just need to find it Smiley

Cheers,
Tim
N/A

Stable rate stuck on 500

Thought I'd add my information to this thread. I get quite a few of these messages in my router logs (ZyXEL Prestige 660HW-61).

From what you've said I assume this means my router is re-syncing at a different rate? Regarding the 3 day period to get the stable rate back up, does it matter how many times the router re-syncs during this period. For example, my stable rate is stuck at 1000. Provided my router syncs between 2000 and 2500 over a 3 day period would that be enough to see the stable rate increase?

06/08/2006 07:52:43 ppp:IPCP Opening
06/08/2006 07:52:43 ppp:IPCP Starting
06/08/2006 07:52:43 ppp:CHAP Opening
06/08/2006 07:52:43 ppp:LCP Opening
06/08/2006 07:52:43 ppp:LCP Starting
06/08/2006 07:52:43 ppp:LCP Closing
06/08/2006 07:52:43 ppp:LCP Opening
06/08/2006 07:52:40 ppp:LCP Starting
06/08/2006 07:52:40 board 0 line 0 channel 0, call 68, C02 OutCall Connected 512000 CALL DETAIL RECORD
06/08/2006 07:52:40 board 0 line 0 channel 0, call 68, C01 Outgoing Call dev=5 ch=0 CALL DETAIL RECORD
06/08/2006 07:52:37 board 0 line 0 channel 0, call 67, C02 Call Terminated
CALL DETAIL RECORD
06/08/2006 07:52:34 ppp:LCP Closing
06/08/2006 07:52:34 ppp:LCP Opening
06/08/2006 07:52:34 ppp:LCP Starting
06/08/2006 07:52:34 board 0 line 0 channel 0, call 67, C02 OutCall Connected 512000 CALL DETAIL RECORD
06/08/2006 07:52:34 board 0 line 0 channel 0, call 67, C01 Outgoing Call dev=5 ch=0 CALL DETAIL RECORD
06/08/2006 07:52:07 ppp:IPCP Closing
06/08/2006 07:52:07 ppp:LCP Closing
lunarjetman
Grafter
Posts: 59
Registered: 31-07-2007

Stable rate stuck on 500

Quote
Provided my router syncs between 2000 and 2500 over a 3 day period would that be enough to see the stable rate increase?


From my own experience that does appear to be the case. As I say, my sync rate is different every day. For most of last week my stable rate was 2000Kbps but after 3 days where I syncd at 2912, 2944 and 3008 it went up to 2500Kbps.

Apparently it is possible to find out the DSL connection uptime on a Linksys WAG54G if you go to:

http://<enter your router ip here>/ADSLCStatus.htm

The "Showtime last (sec)" figure is how long since the last sync in seconds.
daveyb
Grafter
Posts: 128
Registered: 04-08-2007

Stable rate stuck on 500

The honest answer is I don't know if it matters how many times it resyncs if they are all over the threshold you're trying to achieve - although presumably, even if there are a few resyncs, your lowest one stays in sync for sometime (as otherwise I assume the negotiation would keep dropping the sync speed until it did reach a stable point). If the lowest one is over the threshold you would expect that to be OK.

The software that determines the bRAS profile must also allow for the fact that some people use USB modems and maybe only have their computer on for a hour or so at a time and so that would be the longest sync period.

David.