Re: Terrible performance Leicester (LE3)
 

I have this in my modem config pages

But my Upstream config is this which is the 2Mb upload.
So what does the Upstream Symbol rate actually mean.

Re: Terrible performance Leicester (LE3)
 

It's a cosmetic bug in some Ambits, they list the upstream bit rate in the symbol rate section.

You should know that :p:

Re: Terrible performance Leicester (LE3)
 

I know that 2080000 is the 2 Mb upload but what has 5120 Ksym/sec got to do with it.

Re: Terrible performance Leicester (LE3)
 

I will update again if the config changes.

here is an outgoing traceroute from my freebsd virtual machine routed over VM.

root@vm net-snmp # traceroute -I virginmedia.com
traceroute to virginmedia.com (212.250.162.12), 64 hops max, 72 byte packets
1 192.168.1.1 (192.168.1.1) 0.900 ms 1.246 ms 1.026 ms
2 cpc6-leic15-2-0-gw.8-1.cable.virginmedia.com (82.7.80.1) 38.219 ms 14.716 ms 16.196 ms
3 leic-core-1a-ae3-2234.network.virginmedia.net (82.3.33.73) 11.650 ms 11.687 ms 21.632 ms
4 leed-bb-1a-as8-0.network.virginmedia.net (213.105.172.17) 40.776 ms 14.110 ms 24.212 ms
5 manc-bb-1b-as3-0.network.virginmedia.net (213.105.175.142) 70.588 ms 28.153 ms 26.090 ms
6 winn-bb-1a-as3-0.network.virginmedia.net (212.43.163.190) 25.937 ms 36.526 ms 44.842 ms
7 win-dc-a-v900.network.virginmedia.net (62.253.188.162) 20.247 ms 34.619 ms 52.626 ms
8 git-dmz4-css-4b-vip07.network.virginmedia.net (212.250.162.12) 25.448 ms 48.076 ms 23.472 ms

still jitter but all in 2 figures only.

I am not complaining about this change, if its deliberate VM should have done this weeks ago, better to have a slower speed thats more stable and useable then what I have had for the last 2 weeks.

Re: Terrible performance Leicester (LE3)
 

5120Ksym/sec is the underlying symbol rate used on the upstream channel. 16QAM modulation transmits 4 bits per symbol, so 5120,000 symbols per second = 20,480,000 bits per second = he's on a 20mbit (DS2.0+) upstream channel.

From what I understand it legacy upstream channels are 10mbit (2560Ksym/sec 16QAM) and a 20mbit upstream channel is a prerequisite for 10:1 upstream.

Re: Terrible performance Leicester (LE3)
 

Still on 512 here on 10Mb.


Tracing route to virginmedia.com [212.250.162.12]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms [192.168.1.1]
2 10 ms 9 ms 7 ms cpc7-leic15-2-0-gw.8-1.cable.virginmedia.com [213.81.68.1]
3 10 ms 8 ms 19 ms leic-core-1a-ae3-2233.network.virginmedia.net [82.3.33.69]
4 11 ms 11 ms 12 ms leed-bb-1a-as8-0.network.virginmedia.net [213.105.172.17]
5 14 ms 12 ms 12 ms manc-bb-1b-as3-0.network.virginmedia.net [213.105.175.142]
6 19 ms 19 ms 17 ms winn-bb-1a-as3-0.network.virginmedia.net [212.43.163.190]
7 25 ms 34 ms 20 ms win-dc-a-v900.network.virginmedia.net [62.253.188.162]
8 22 ms 19 ms 20 ms git-dmz4-css-4b-vip07.network.virginmedia.net [212.250.162.12]

Trace complete.

Re: Terrible performance Leicester (LE3)
 

hmm move me to cpc7 please :(

Re: Terrible performance Leicester (LE3)
 

Sorry! Looks like they are definitely upto something.

https://www.cableforum.co.uk/images/...2010/12/19.png

http://www.pingtest.net/result/30460388.png

http://www.thinkbroadband.com/ping/s...18-12-2010.png

Ignore the loss from 5 till 7pm, was watching a joke of a football match!

Re: Terrible performance Leicester (LE3)
 

didnt think it be possible on reduced upstream but can get full speed on this new config.

4.30 pm 19.50 down 0.35 up
now 18.96 down 0.32 up

in between them I had a 11mbit down tho is still varying a fair bit. jitter high but not crazy.

Re: Terrible performance Leicester (LE3)
 

my sister's part of leics has improved since summer, latency is way down and about half of mine, not varying a lot. speeds are higher than they were in the summer but still flaky. Although I tested it over christmas eve and day and christmas usage seems to be a bit down on the average.

Re: Terrible performance Leicester (LE3)
 

Traffic shaping being in effect perhaps and of course people doing the "christmas" thing with friends and family rather than spending time on their PCs?

Re: Terrible performance Leicester (LE3)
 

unless their is a special xmas shaping profile it wont be that. Most likely people just having more family time.

Re: Terrible performance Leicester (LE3)
 

The will be less people online as Traffic Management is enforced 24/7 within the specified time ranges.

Re: Terrible performance Leicester (LE3)
 

this will widen peoples eyes.

My VM connection has been down since 4pm today (was asleep) and just hit renew dhcp on my router to get it back.

upstream back to 768000 and downstream channel has changed, however still on that same upstream. :( will report back in a bit on jitter etc.

--edit--

seems a lot better initially.

9ms jitter on pingtest and 19.43 down 0.73 up on speedtest.

Re: Terrible performance Leicester (LE3)
 

Something definitely is going on.
Connection up and down all afternoon.

https://www.cableforum.co.uk/images/local/2010/12/4.png