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Line speeds, noise and attenuation

post #1 of 6
Thread Starter 
We are having dire problems with the internet dropping out altogether and awful speeds. It is intermittent and BT will send an engineer, but if they find no fault, they will charge us a £126 fee.

I am thus trying to provide as much stats as possible to show him, just in case it all works fine upon his arrival. I took down line stats on my router and got:

Quote:
noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 28 db

noise margin downstream: 17 db
output power upstream: 12 db
attenuation downstream: 52 db
Do these seem very high?
post #2 of 6
First and foremost, who is your ISP? Is it BT (I know they own the line, but that doesn't mean they're your ISP)? What make and model is your router?

Secondly, try using a different ADSL cable to connect between your modem and your wall socket. Also, try replacing all of the ADSL filters you have in use - get your ISP to send some.

Your noise margin should be between 6.0 and 9.0 downstream for ADSL2+ on a good line. This is what I have, as well as downstream attenuation of 39.5dB.

Can I assume that your line speeds are very poor?
Edited by parityboy - 6/21/11 at 12:54pm
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post #3 of 6
Quote:
attenuation downstream: 52 db
Not very good

is FTTC/fibre hit where you are yet?
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post #4 of 6
Thread Starter 
My ISP is the Post Office who lease a line from BT. We are on the Poplar exchange, I have changed the ADSL filters and added an iPlate on the phone to reduce line noise.

My line speeds are terrible, would you guys think this is a physical line problem.
post #5 of 6
That output power is pretty low given the high attenuation..
Noise margin is fine, higher is generally better.

What kind of sync speed are you getting to the DSLAM vs. the package you pay for?

Edit:
Sneaky, I just noticed the output power for downstream is tucked in with your upstream stats. That's usually about as high as it goes.
Edited by beers - 6/22/11 at 9:53pm
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post #6 of 6
You're speed is bad due to you being far from the exchange but from what i can tell you can get 50-100mbps cable from virgin or 40mbps from BT/Plusnet/talktalk ect

put in you're phone number here

https://www.btwholesale.com/includes/adsl/main.html

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