«

On Sat, 13 May 2006 21:58:31 +0100, wrote:

>On 13 May 2006 04:56:31 -0700, ""
><> wrote:
>
>>I experience a lot of lost packets on my ADSL connection
>>(always have done and there's nothing that can be done about it).
>
>I doubt it. I started seeing lost packets, and my ADSL supplier
>Eclipse tried to make out that it was at my end, and would do nothing
>to investigate. So I switched to Zen. No more lost packets: the
>problem was gone immediately, and all I'd changed was the username and
>password in the modem/router.
>
>Lost packets could be very bad on VOIP - what if that packet was
>telling the call to hang up?

I would be repeated due to lack of an ack.

On Sat, 13 May 2006 21:58:31 +0100, wrote:

>On 13 May 2006 04:56:31 -0700, ""
><> wrote:
>
>>I experience a lot of lost packets on my ADSL connection
>>(always have done and there's nothing that can be done about it).
>
>I doubt it. I started seeing lost packets, and my ADSL supplier
>Eclipse tried to make out that it was at my end, and would do nothing
>to investigate. So I switched to Zen. No more lost packets: the
>problem was gone immediately, and all I'd changed was the username and
>password in the modem/router.
>
>Lost packets could be very bad on VOIP - what if that packet was
>telling the call to hang up?

Wouldn't the protocol pick that up within a fairly short period of
time and resend the instruction once it had realised the request
hadn't been acknowledged?

Chris

It's a sad fact around here that due to the length of our aging
telephone lines, uncorrected blocks on ADSL are the norm. Uncorrected
blocks do not usually pose a problem but where you have a lot in
sequence you do suffer lost packets of time sensitive data. If you are
interested my Syslog shows around two million uncorrected blocks a day.
On a good day! In terms of packets lost, it's about 1% of packets
recieved. Unnoticable at G.729A/B but intrusive at G.711A.

Do you think it's just because the Vigor's implementation of G.711A is
poor?

Anyone else have experience of Rx losts?

Chris

On 14 May 2006 01:26:23 -0700, ""
<> wrote:

>It's a sad fact around here that due to the length of our aging
>telephone lines, uncorrected blocks on ADSL are the norm. Uncorrected
>blocks do not usually pose a problem but where you have a lot in
>sequence you do suffer lost packets of time sensitive data. If you are
>interested my Syslog shows around two million uncorrected blocks a day.
> On a good day! In terms of packets lost, it's about 1% of packets
>recieved. Unnoticable at G.729A/B but intrusive at G.711A.

1% seems a huge percentage to me. What is the SNR margin on your
connection?

What you need to do is to start out by finding how many packets are
being lost. I suggest you open an account at l8nc.com and monitor your
ADSL connection for a while (the Vigor needs to be set to respond to
pings from the internet, of course)

It's probably a good idea to run pathping to some suitable destination
to see where they are being lost.

On 14 May 2006 01:26:23 -0700, ""
<> wrote:

> On a good day! In terms of packets lost, it's about 1% of packets
>recieved. Unnoticable at G.729A/B but intrusive at G.711A.

I don't see why that should always be the case?

wrote:
> On 14 May 2006 01:26:23 -0700, ""
> <> wrote:
>
>
>>It's a sad fact around here that due to the length of our aging
>>telephone lines, uncorrected blocks on ADSL are the norm. Uncorrected
>>blocks do not usually pose a problem but where you have a lot in
>>sequence you do suffer lost packets of time sensitive data. If you are
>>interested my Syslog shows around two million uncorrected blocks a day.
>>On a good day! In terms of packets lost, it's about 1% of packets
>>recieved. Unnoticable at G.729A/B but intrusive at G.711A.
>
>
> 1% seems a huge percentage to me. What is the SNR margin on your
> connection?
>
> What you need to do is to start out by finding how many packets are
> being lost. I suggest you open an account at l8nc.com and monitor your

Wooo! Yes, everyone talk about l8nc </plug>

> ADSL connection for a while (the Vigor needs to be set to respond to
> pings from the internet, of course)

After much messing around I've got MRTG monitoring various outputs from
my Vigor 2800 (www.letmethink.co.uk/stats). The 'ATM errors (since link
up)' graph is accurate but I'm using the perhour option on the 'ATM
errors graph' so divide by 12 and call the y-axis 'Errored blocks per 5
minutes'. It shows some time of day variation in CRC errors but none of
it is significant enough to cause any packet loss
(http://www.l8nc.com/graph.php?jid=82...971d485ab11eb).


> It's probably a good idea to run pathping to some suitable destination
> to see where they are being lost.

WinMTR and MTR are pretty good at this sort of thing.

Alex

On Sun, 14 May 2006 22:21:40 +0100, alex <> wrote:

>It shows some time of day variation in CRC errors but none of
>it is significant enough to cause any packet loss

I can't see any evidence of any packet loss at all.