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Author Topic: Line 3 just went nutty for 2.5 hours then recovered  (Read 775 times)

Weaver

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Line 3 just went nutty for 2.5 hours then recovered
« on: March 25, 2017, 03:30:11 PM »

Line 3's modem went into a crazy cycle of connecting, dropping the connection, reconnecting starting at around 10:30 this morning and carried on until 13:15 or thereabouts. After this bout of madness, the downstream sync rate dropped from 2.8Mbps to just under 2.0 which is an FTR breach and I think this was due to DLM pushing the target SNRM up from 6dB to 9dB.

I didn't spot it for a long time and when I finally did see it it had just been mysteriously fixed by something unknown. I talked to AA who pushed through an SNRM reset.

The thing is, about ten minutes before line 3 went postal, Mrs Weaver had just swapped out the modem that was on line 1 for a different unit. When she came back at 13:15 she plugged the new line 1 modem into the router (a Firebrick). So the start of the line 3 madness began shortly after intervention by Mrs Weaver and again her action somehow cured it. Line 4 became mildly unhappy for parts of the period on line 3's insanity, showing up to 4% packet loss on AA's CQM PPP LCP pings for no reason at times. I'm trying to work out how Mrs Weaver might have done something bad. I asked her to plug in a new modem into line 1 but there was no mention of doing anything to the other lines. I don't recall whether or not she has put labels on the wallsockets, if not she just knows which is which.
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burakkucat

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Re: Line 3 just went nutty for 2.5 hours then recovered
« Reply #1 on: March 25, 2017, 10:03:11 PM »

I get very confused at to "what's what" with your usage of "Line n" names.  ???  It probably doesn't help that you have three bonded lines that are referred thereto as "Line one", "Line three" and "Line four"!  :-X

Would it be possible to refer to each by its Openreach circuit ID or failing that, by the six digit telephony subscriber number for each circuit?  :-\

To assist visiting Openreach technicians, Mrs Weaver or any shot-putting & caber-tossing ladies of the Village, the circuit IDs could be marked on each respective socket.
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Weaver

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Re: Line 3 just went nutty for 2.5 hours then recovered
« Reply #2 on: March 26, 2017, 03:16:11 AM »

Certainly be glad to do so. The numbers I use are those allocated by AA, and some of them are not DSL lines, rather 3G/4G connections to SIMs.

This is what I have, and I also have phone numbers too (although no voice service)

    * Line 1 cwcc@a.1 BBEU20700042
    * Line 3 cwcc@a.3 BBEU20700055
    * Line 4 cwcc@a.4 BBEU20709519

Mrs Weaver knows them by line 1 / 3 / 4, I don't know if she has labelled them. She might well be able to come up with some jam labels. Indeed Janet used to be the queen of label printing with her faithful  Dymo label printer.
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burakkucat

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Re: Line 3 just went nutty for 2.5 hours then recovered
« Reply #3 on: March 26, 2017, 09:12:46 PM »

Thank you. Much appreciated. I shall now make an appropriate note.  :)
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Weaver

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Re: Line 3 just went nutty for 2.5 hours then recovered
« Reply #4 on: March 27, 2017, 07:43:39 PM »

And it happened again, same thing, same line, this time for around 1 hour duration. What happened was that Mrs Weaver plugged in a Huawei SmartAX MT882 into line cwcc@a.1 = BBEU20700042, then about ten minutes afterwards, line cwcc@a.3 = BBEU20700055 went bonkers, cycling, going down / up / down again for about an hour and then calmed down on its own as far as I can see. The remaining line - cwcc@a.4 = BBEE20709519 - showed a burst of packet loss around the time that cwcc@a.3 went nutty, but none of the cycling behaviour.
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burakkucat

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Re: Line 3 just went nutty for 2.5 hours then recovered
« Reply #5 on: March 28, 2017, 02:03:01 AM »

I understand what you have described but I am unable to think of any reason why it occurred.

As an aside (another one of those "rules of paw" from The Cattery), I would always advise that the modification of a modem's configuration should always be performed with it disconnected from the xDSL circuit. 
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