Cable Forum - Packetloss issues

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Packetloss issues

Hi there everyone.

I'm having a bit of a problem with packetloss at the moment, especially in the online games that I play.

Whenever I do a trace on the server to see where the loss is coming from it states that 10.183.0.1, the second hop, is the one with the most packetloss. Am I right to assume that this hop is the first one at the ISP?

I have run the docsdiag program at http://homepage.ntlworld.com/robin.d.h.walker/docsdiag/ and got the following results:

Quote:

System up time = 5 days 03h 08m 39.00s
Ethernet other recv errors.2 = 8256
Downstream channel ID = 2
Downstream channel frequency = 331000000 Hz
Downstream received signal power = -5.8 dBmV
Upstream channel ID = 3
Upstream channel frequency = 29008000 Hz
QoS max upstream bandwidth = 384000 bps
QoS max downstream bandwidth = 4096000 bps
SigQu: Signal to Noise Ratio = 35.5 dB
Cable modem status = Operational
Upstream transmit signal power = 49.0 dBmV
Date and Time = 2006-04-11,22:27:32.0+00:00
Configuration filename = cm-4096-384

I'm not entirely sure about the Telewest limits for the downstream & upstream signals, but I have been told that these may be outside the accepted range.

Other information that may be important; I have a Surfboard SB4100 Cable Modem & restarting it does not seem to help at all.

I would be grateful if anyone could shed any light on why this problem is occuring or possible fixes.

Thankyou very much!

Re: Packetloss issues

You are orrect to assume that is the first hop to the actual servers at Blueyonder.
And your power levels seem perfectly fine to me, mine run very close to that, and often hit 49dbmv as well. Nothing wrong with my 4Mb (nw i've got the network issue out of the way that is)

[img]Download Failed (1)[/img]

Re: Packetloss issues

Acceptable power levels are:

Downstream power levels: between -8dBmV and +8dBmV
Upstream: 30dBmV to 55dBmV (lower is better)
SNR: 30dB to 37dB (higher is better)

Yours look ok to me, upstream might be a little high but I dont think this is causing your problems. A call to telewest is probably in order if it continues.
-Chris

Re: Packetloss issues

http://www.cableforum.co.uk/board/sh...ad.php?t=26006

Quote:

Both Telewest and ntl are now using the more efficient, but demanding 256QAM modulation in some areas. This gives more bandwidth but required better networks. For this modulation the recommended power range is -6dBmV to +15dBmV with a recommended SNR of 33dB.

Your downstream receive power is a bit on the low side, in any case if you could supply us a traceroute that'd be appreciated, and suggest you speak to Telewest about it see if they can see anything wrong.

simpsonsFAN those values are all incorrect, disregard them.

EDIT: Nevermind just seen a post of yours on Digital Spy where you quote different values. The ones in the sticky on this site are correct as per DOCSIS 1.1 specifications.