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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Query about BRAS rate changes

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Old June 11th 06, 04:10 PM posted to uk.net.providers.aaisp,uk.telecom.broadband
Alan J. Flavell
external usenet poster
Posts: 126
Default Query about BRAS rate changes

[note crosspost, and proposed f'up for more general interest]

On Sun, 11 Jun 2006, roga wrote:

"Jules" wrote in message
I've been having some issues with frequent resyncs for the past
month or so. From what I'm seeing on the Draytek support group, it
now looks likely that the cause may be some oversensitivity on the
part of my router (a Vigor 2800G), which is over-optimistically
trying to resync higher at times

I got a 2800 to be stable by:

1) Downloading the latest firmwa (mine wasn't a "G")

2) Using the "adsl codinggain" command via telnet

In the discussions most people seem to want to increase their
download rate, however I was more interested in stability and, as
this was being used for VOIP the upload speed was in fact as

(me too)

adsl codinggain 1 is least optimistic and most stable

However, AIUI this would get you additional SNR margin at /whatever/
speed you happened to re-sync your router. If it happened to re-sync
at a noisy moment, you can see what would happen...

My observations were that I was getting an SNR margin that was varying
over the 24 hours, but, apart from that, was pretty stable in the
medium/long term.

So, if I re-synced at a quiet time, the router would pick an
over-optimistic downstream rate, and then (typically late evening,
around 21:00) it would fail, and re-sync at a lower rate. After a
while, it would pick a rate (in my case a bit below 6000) which was
long-term stable.

Whereas if I sync'ed at a noisy time, it would pick the stable speed
immediatly, and would then remain stable thereafter.

So I decided that a good solution would be to set a max downstream
rate, to a value which I knew from experience was sustainable. As I
was just reporting on u.t.b: I found a way to do that with my bt
voyager 205; and I see elsewhere that other routers (with different
command sets) can also do that.

the full list of commands is:

adsl codinggain 3
adsl savecfg
adsl reboot

There would be a corresponding command sequence with the '205,
(disclaimer - I haven't actually tried it in production) i.e

modify dsl config gain 3

But, as I said, I went for adjusting maxdnrate instead, to a value
which I knew from experience would be sustainable.

h t h

At any rate, this is far easier than contacting the ISP and persuading
them to contact BTw to set some non-standard value on the exchange

Apropos of which - is there any parameter which the client can set to
decline interleaved mode and only use fast mode? I think I'd rather
have low latency, even at some modest penalty in speed. But I'd like
to be able to control it myself, if at all.

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