Attenuation/noise margin check (pics)

[Bane]

This is using a Thompson Speedtouch ST585 v6, firmware 6.2.29.2 with wireless dsiabled.

The house doesn't have a BT NT05 master socket to test, and there is a few hardwired extensions coming from main socket. Going to suggest getting a proper BT socket installed, but wanted to know what the attenuation and SN margin should should be?

They had a BT USB modem before this. Was rubbish on that too.

As far as i know this is an 8Mb package, but need to wait until I see owner before can confirm.

9th October

10th October

11th October

 

[tolien]

There's no "right" answer for any of them - attenuation is a function of the length and material of your line. Your line's either quite long or mostly composed of aluminium rather than copper.

What did you do between the three shots?

 

[Bane]

The pictures taken over three days. Will amend original post.

 

[WOMBATWILSON]

looks like they are roughly 4.5km away from exchange so your not going to get anything brilliant but they look better than mine

 

[Sel]

With an attenuation of 52db and perfect internal wiring you could get 4-5meg.
I have a good but long line 56db and got over 4meg, however it's BT and if you look around other forums many people are getting very poor throughput speeds due to BT's heavy traffic shapping.

In effect my BT line wasn't any better then a 1meg connection for the last month or so.

 

[Bane]

So the FEC, CRC, HEC errors at bottom of each screen shot mightn't be due to poor house wiring?

 

[tolien]

They might be, but unless there's some actual problem they're not important. Without eliminating the wiring it's impossible to tell...

Are they switching the router off at night or something?

Uptime: 1:02:04

Uptime: 3:17:09

Uptime: 35:59

 

[Sel]

Some times my errors were in the millions when I was with BT. Even so when I restarted the router my speed would still improve.

It's not just internal wiring that can effect errors, just restarting the router and getting a different IP seems to change the error rate dramatically.

I'm now with O2 and my errors are huge compared to last months errors with BT.

Uptime: 1 day, 20:03:30
Error Seconds (Local/Remote): 34 / 0
FEC Errors (Up/Down): 1,164 / 40,603,048
CRC Errors (Up/Down): 1,164 / 3,860
HEC Errors (Up/Down): 743 / 1,535

I haven't noticed any problems surfing or downloading, I never got FEC,CRC or HEC upload errors with BT.

 

[Bane]

Not sure if the home owners turn the router off, but as I'm here for a week I've been turning it off while not in use.

I thought the errors were a problem and casuing slow browsing. But if that's not considered an issue, I won't mention it.

Be glad when I'm back at home and on my, in comparison, quality line

Thanks for the advice.

 

[Sel]

Have you done a speed test?

http://www.speedtester.bt.com/

 

[tolien]

If you're seeing a lot of packet loss and slow browsing, they might be the cause, but they're not that high...

It's not just internal wiring that can effect errors, just restarting the router and getting a different IP seems to change the error rate dramatically.

The errors are purely at the modem to exchange level, so getting a different IP won't do a thing - reconnecting will change some of the parameters the modem and DSLAM agree on and probably avoid frequencies that are causing the errors in the first place.

 

[Locky]

Modulation: G.992.5 Annex A

Bandwidth (Up/Down) [kbps/kbps]: 1,066 / 5,992

Data Transferred (Sent/Received) [KB/KB]: 140.00 / 387.00

Output Power (Up/Down) [dBm]: 12.0 / 19.0

Line Attenuation (Up/Down) [dB]: 33.5 / 58.0

SN Margin (Up/Down) [dB]: 6.5 / 4.5


Long line arnt all that bad, I dont do to badly with a long line, I think mines all copper as I do live a fair distance from the exchange.