What speeds should I expect on 20Mbps

[kwikbreaks]

Had the install on Friday. Promised router didn't arrive so this is direct modem to PC which is running XP. I ran through the DSLreports tweaks to tune up the TCP/IP settings as I wasn't 100% sure they were not a problem although the same machine performed well on ADSL being able to download at ~ 15Mbps

I've looked at the sticky on modem stats and mine are well within the limits quoted there.

I've been otherwise engaged in the evenings so don't have any speedtests in what I'd regard as true peak times but the only really good ones have been at times I'd never normally be using it. The rest have shown wild variations and are frequently way down on what I'd expect. I've pasted in the TBB results below as they keep a record but checks with other testers have shown similar.

I've seen complains about VM speeds but assumed these were from people being throttled because of prior heavy downloads as many people posted to say they always got close their headline speed.

I'll obviously check some evenings this week but would like to ask if this is the sort of performance I should be expecting...

Date Time Downstream Upstream
10/05/10 11:20 14676.70 Kbps 706.43 Kbps
10/05/10 10:45 7012.81 Kbps 704.72 Kbps
10/05/10 08:43 14431.13 Kbps 697.10 Kbps
09/05/10 12:49 9131.54 Kbps 638.26 Kbps
09/05/10 10:30 12347.50 Kbps 649.64 Kbps
09/05/10 06:35 19101.01 Kbps 720.67 Kbps
08/05/10 15:00 11678.12 Kbps 685.83 Kbps
08/05/10 12:01 10832.45 Kbps 686.89 Kbps
08/05/10 02:56 17617.96 Kbps 714.62 Kbps
07/05/10 17:55 13419.77 Kbps 665.42 Kbps
07/05/10 17:06 8502.17 Kbps 659.03 Kbps

[Sephiroth]

On the basis of my own experience right now 11:50

Overall Average Speed = approx 13520 Kbps, 13.2 Mbps
Overall Average Speed = approx 11381 Kbps, 11.11 Mbps
Overall Average Speed = approx 5156 Kbps, 5.04 Mbps
Overall Average Speed = approx 6273 Kbps, 6.13 Mbps
Overall Average Speed = approx 6475 Kbps, 6.33 Mbps
Overall Average Speed = approx 7059 Kbps, 6.89 Mbps
Overall Average Speed = approx 5850 Kbps, 5.71 Mbps
Overall Average Speed = approx 6481 Kbps, 6.33 Mbps

It moves from minute to minute according to what's going on in your area (more specifically optical node).

So, perhaps you'll post your modem stats and event log for us to take a look. Also could you perform in the DOS window PATHPING www.bbc.co.uk so we can see where in the VM system there might be some clog.

[roughneck]

Use the "Speed Test (<50M)" at the top of this page and post the results.

e.g.

Mon, 10 May 2010 10:54:21 UTC

Test 1: 1024K took 3525 ms = 290.5 KB/sec, approx 2394 Kbps, 2.34 Mbps
Test 2: 1024K took 3526 ms = 290.4 KB/sec, approx 2393 Kbps, 2.34 Mbps
Test 3: 1024K took 3525 ms = 290.5 KB/sec, approx 2394 Kbps, 2.34 Mbps
Test 4: 2048K took 7036 ms = 291.1 KB/sec, approx 2399 Kbps, 2.34 Mbps

Overall Average Speed = approx 2395 Kbps, 2.34 Mbps

I am on the 10Mbit service and are currently being STM'ed (by 75%) so my results look ok.

roughneck

[kwikbreaks]

Thanks. Hopefully all this is what was wanted...

Cable Modem Information
Cable Modem : DOCSIS 1.0/1.1/2.0 Compliant
MAC Address : <removed just in case>
Serial Number : <this too>
Boot Code Version : 1.1.2c
Software Version : 2.111.1002
Hardware Version : 1.9
======
Cable Modem Status
Item Status Comments
Acquire a Downstream Channel 331000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
======
Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 6
Downstream Frequency : 331000000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 5360.537 Ksym/sec
Downstream Interleave Depth : taps32Increment4
Downstream Receive Power Level : 4.8 dBmV
Downstream SNR : 41.6 dB
=====
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 2
Upstream Frequency : 37500000 Hz
Upstream Modulation : QAM16
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 53.5 dBmV
Upstream Mini-Slot Size : 2
=====
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 2
Upstream Frequency : 37500000 Hz
Upstream Modulation : QAM16
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 53.5 dBmV
Upstream Mini-Slot Size : 2
=====
Cable Modem Operation Configuration
Network Access : Allowed
Maximum Downstream Data Rate : 20480000
Maximum Upstream Data Rate : 768000
Maximum Upstream Channel Burst : 3044
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Enabled
=====
Cable Modem Event Log
First Time Last Time Priority Description
Time Not Established Time Not Established Error (4) ToD request sent- No Response received
=====

(I cleared the event log just after the install was completed and I found it)


Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Mark>pathping www.bbc.co.uk

Tracing route to www.bbc.net.uk [212.58.246.159]
over a maximum of 30 hops:
0 EEEBox.cable.virginmedia.net [81.107.nnn.nnn]
1 10.98.128.1
2 nrth-cam-1b-v100.network.virginmedia.net [213.104.142.129]
3 nrth-core-1b-ge-012-0.network.virginmedia.net [195.182.178.209]
4 nrth-bb-1b-so-511-0.network.virginmedia.net [212.43.162.241]
5 tele-ic-1-as0-0.network.virginmedia.net [62.253.184.2]
6 pos6-1.rt0.thdo.bbc.co.uk [212.58.239.237]
7 212.58.238.153
8 te12-1.hsw1.cwwtf.bbc.co.uk [212.58.239.234]
9 212.58.255.12
10 fmt-vip02.cwwtf.bbc.co.uk [212.58.246.159]

Computing statistics for 250 seconds...
Source to Here This Node/Link
Hop RTT Lost/Sent = Pct Lost/Sent = Pct Address
0 EEEBox.cable.virginmedia.net [81.107.nnn.nnn]
0/ 100 = 0% |
1 --- 100/ 100 =100% 100/ 100 =100% 10.98.128.1
0/ 100 = 0% |
2 13ms 0/ 100 = 0% 0/ 100 = 0% nrth-cam-1b-v100.network.virginmed
ia.net [213.104.142.129]
0/ 100 = 0% |
3 15ms 0/ 100 = 0% 0/ 100 = 0% nrth-core-1b-ge-012-0.network.virg
inmedia.net [195.182.178.209]
0/ 100 = 0% |
4 13ms 0/ 100 = 0% 0/ 100 = 0% nrth-bb-1b-so-511-0.network.virgin
media.net [212.43.162.241]
0/ 100 = 0% |
5 16ms 0/ 100 = 0% 0/ 100 = 0% tele-ic-1-as0-0.network.virginmedi
a.net [62.253.184.2]
0/ 100 = 0% |
6 25ms 0/ 100 = 0% 0/ 100 = 0% pos6-1.rt0.thdo.bbc.co.uk [212.58.
239.237]
0/ 100 = 0% |
7 22ms 0/ 100 = 0% 0/ 100 = 0% 212.58.238.153
0/ 100 = 0% |
8 18ms 0/ 100 = 0% 0/ 100 = 0% te12-1.hsw1.cwwtf.bbc.co.uk [212.5
8.239.234]
0/ 100 = 0% |
9 18ms 0/ 100 = 0% 0/ 100 = 0% 212.58.255.12
0/ 100 = 0% |
10 15ms 0/ 100 = 0% 0/ 100 = 0% fmt-vip02.cwwtf.bbc.co.uk [212.58.
246.159]

Trace complete.


Mon, 10 May 2010 11:32:41 GMT

Test 1: 1024K took 656 ms = 1561 KB/sec, approx 12863 Kbps, 12.56 Mbps
Test 2: 1024K took 776 ms = 1319.6 KB/sec, approx 10874 Kbps, 10.62 Mbps
Test 3: 1024K took 656 ms = 1561 KB/sec, approx 12863 Kbps, 12.56 Mbps
Test 4: 2048K took 1442 ms = 1420.3 KB/sec, approx 11703 Kbps, 11.43 Mbps

Overall Average Speed = approx 12076 Kbps, 11.79 Mbps

[Sephiroth]

Upstream transmit Power Level : 53.5 dBmV

Thanks for that. Keep an eye on the upstream power. If it stays steady at 53.75 dBmv, then it might not be a worry - though it's higher than I would like because it sails close to the 55 dBmv point where everyone agrees that you modem and CMTS are struggling to communicate with each other.

The rest of the stats are fine. The fact that there are no T3 errors in your event log suggests that there is currently no upstream problem; the pathping confirms that too as well as the speed test which is better than mine!

So keep an eye on things during non-peak time becasue that's when we can rule out serious congestion.

In the evening I expect your performance to dip. It might be interesting to see by how much. If your upstream is struggling, then the dip would be significant.

[kwikbreaks]

Thanks

My concern is that even at what I would expect to be offpeak the speeds are only just over half of the headline speed. I did significantly better than that on ADSL which I ditched because a line fault was making the phone almost unusable and even after 5 visits BT couldn't fix it.

Cable is significantly more expensive than ADSL so I would expect it to perform better not worse. If it isn't going to do that I may as well drop out now back to ADSL and use a mobile phone if they still can't fix the line.