Kitz Forum

Broadband Related => FTTC and FTTP Issues => Topic started by: happyhorse on August 07, 2017, 10:51:26 AM

Title: SNRM impacted when raining or phone in use
Post by: happyhorse on August 07, 2017, 10:51:26 AM

Hello all,

I was hoping someone might be able help with my line stats, in particular the variations in SNRM that occur when it rains or when the phone line is in use.

I've been logging to MDWS for some months now and have seen a consistent pattern of SNRM drops due to rain.  Both upstream and downstream are affected, although the impact is usually greater on the upstream value.  A couple of recent examples of this can be seen on July 29th and August 2nd.

More recently I've been seeing downstream dips every time the phone is in use.  Most of the time this seems to result in a temporary 1dB drop in downstream SNRM, but yesterday (August 6th) there was a more significant example in which the downstream SNRM went from 5.9dB down to 1.6dB before eventually recovering to 5.8dB.

In terms of setup, I have an HG612 connected directly to an NTE5C master socket with VDSL faceplate.  There is also a DECT phone connected to the master, and I have extension wiring from the filtered side of the master going to an ADT alarm. 

Fortunately, I've had no resyncs as a result of this but I wondered if it might be an indication of a line problem.  I've tried the BT quiet line test (with a corded phone), but that didn't seem to reveal anything untoward.

Thanks for your help.

Title: Re: SNRM impacted when raining or phone in use
Post by: Chrysalis on August 07, 2017, 12:34:30 PM

If SNRM is impacted during calls it suggests a possible high resistance fault on the line.

Title: Re: SNRM impacted when raining or phone in use
Post by: burakkucat on August 07, 2017, 06:00:02 PM

Quote from: Chrysalis on August 07, 2017, 12:34:30 PM

If SNRM is impacted during calls it suggests a possible high resistance fault on the line.

Yes, that is my immediate thought. A developing HR or semi-conducting joint.

Title: Re: SNRM impacted when raining or phone in use
Post by: happyhorse on August 07, 2017, 06:28:01 PM

Thanks.  Would my best best be to raise a phone line fault now (rather than waiting to see if it becomes more noticeable), and is there any additional data I should be trying to gather to help with that?

Title: Re: SNRM impacted when raining or phone in use
Post by: burakkucat on August 07, 2017, 06:39:12 PM

If I have understood the situation correctly, you currently do not notice anything untoward when using the telephone. No clicks, buzzing, whooshing noises, cross-talk (from the local gossip), hum, etc. So you really do not have anything to justify making a telephony fault report.

My advice is to wait and see if the suspected fault develops into something that affects the telephony service . . . then make a fault report.

[Edited to correct spelling mistake.]

Title: Re: SNRM impacted when raining or phone in use
Post by: happyhorse on August 07, 2017, 10:16:26 PM

OK, that's what I'll do.  Thanks again for your help.