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Thread: Attenuation. That looks worrying...

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    isn't trying to wind U up Shooty*'s Avatar
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    Attenuation. That looks worrying...

    Hi guys,
    Would appreciate some help.
    I'm on Plusnet. I've never had a problem with my internet connection with them. It's ADSL.
    I've recently bought 2 fire sticks (amazon TV things). The Router that plusnet gave me was starting to creak wiht all my wifi devices before that, and gave out: it was unable to stream properly to them, so I splashed out on an Asus N55U router/ modem.

    In terms of Wifi, it's really helped: I can stream to the fire sticks now, without buffering. Happy with that.

    In terms of my broadband connection, the connection was giving out every 15 minutes for the first 12 hours or so after I plugged it in. I narrowed that down to my own fault in not putting the correct encapsulation, and since I changed that, it managed 12 hours unbroken connection today before I unplugged it to move it.

    Now... my problem is this:


    From my reading around this morning, that is only a barely acceptable SNR rate, and the attenuation down is alarmingly high.
    Is that right?
    I've unplugged my phones from the line: No change.
    I swapped the microfilters: No change.

    I'm wondering whether I need to get a telephone engineer out to have a look at my line.
    I have not plugged the router into the "master" socket yet.
    There is a "stability adjustment" option on the N55U, but it's greyed out and I cannot alter it.

    Any thoughts gratefully received.
    Last edited by Shooty*; 29-07-2015 at 10:05 PM.
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    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Attenuation. That looks worrying...

    What was it before you moved it?
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    Re: Attenuation. That looks worrying...

    Ermm isn't 6 db-doodars the normal SNR for bt ADSL?

    It was for adsl 1....unless you got DLMed.

    (and yes I cant type becasue I'm inebriated)
    Last edited by g8ina; 30-07-2015 at 06:32 PM.

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    Re: Attenuation. That looks worrying...

    Error correction counts (FEC, HEC + CRC) look pretty high for a 5.5 minute connection, I'd want to test it in the Master socket.

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    Re: Attenuation. That looks worrying...

    6dB snr seems to be about right - the signal power is 4 times stronger than the noise level. Routers/exchange equipment will negotiate a speed to give 6dB snr anyway so if your connection speeds are not significantly different before and after you moved it, then you are probably worrying unduly.

    If the speed increases significantly when plugging into the incoming master socket, then you have a problem with your house internal wiring.
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    Re: Attenuation. That looks worrying...

    Sometimes when you change router, you need to ask your ISP to re-calibrate the line. That takes a few days to settle down and find the best signalling between the two ends.

    That may be what is happening automatically already if you are getting periodic line resets.

    Try it in the master socket though. If the speed goes up a lot, and you can keep the router nearish the master socket, then a faceplate that acts as a splitter can really help as it isolates the extension wiring from your ADSL signal. Sometimes you lose as much signal in a few m of cheap phone extension cable as you do in a few km of twisted pair from the exchange. In my last house, I re-wired the phone extensions in cat 5 so that last bit was twisted pair as well.

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    isn't trying to wind U up Shooty*'s Avatar
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    Re: Attenuation. That looks worrying...

    Quote Originally Posted by peterb View Post
    What was it before you moved it?
    Ah, now, see, I didn't look! My attention wasn't drawn to it in the way that this one does so. I suppose it probably was buried in a screen somewhere.
    This morning, the connection had been stable since I plugged it in last night. The browsing speed was fine, and I didn't notice any problems. The error count which Satrow mentions below was well up into 5 or 6 figures...
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    Re: Attenuation. That looks worrying...

    Quote Originally Posted by DanceswithUnix View Post
    Sometimes when you change router, you need to ask your ISP to re-calibrate the line. That takes a few days to settle down and find the best signalling between the two ends.
    This.

    I have heard it called numerous things by different support lines. Port reset, training and profiling are the terms I have heard applied to this.
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