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ADSL fault..

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dslcrazy:
Hi,

I've had an ongoing fault for about a month with my adsl provider, maybe more. Had openreach out a few times so far and no testing they've done has found a specific problem.

Intermittent noise on the phone and resyncs daily within 24 hours and often sooner after connecting, At one time the faceplate blew during my ISP testing my phoneline.

Last engineer who came out actually made some improvements to wiring in the cabinet and this did improve the phone noise for me but the problem is still present. I am not sure if there is noise on the QLT at the moment as most of it seems to have cleared up, and I haven't heard it in a couple of days now despite hearing it after the engineer visit.

He said the most likely scenario is an HR fault but he wasn't able to find anything during testing.

Interestingly I setup a technicolor tg582n that I bought purely for testing purposes.. and the line seems to hold above 24 hours for a change. I haven't fully tested it yet for 48 hours but I think it's a bit better. Compared to two routers that fail to reach 24 hours, now sometimes dropping sooner than a day. Any chance my fault cleared but the routers were somehow damaged by the fault? Or maybe it's this particular broadcom router doing better due to the broadcom chip?

Different line profiles have been tried but none have fixed the problem, only increased the uptime a little bit. Before the engineer visit I seemed to notice more problems when it was raining, and I was convinced it was the main cause of the issue but that dissapeared after the cabinet wiring changes too.

Router stats show SNR drops on my ISP issue modem which is a slightly newer broadcom. Technicolor shows no serious downstream SNR drops, only by 0.5. There were some spikes in CRCs and ES at times when monitoring with DSLstats on the technicolor.

I don't have a full days worth of graphs yet as I managed to lose the stats, and have another engineer visit tomorrow so that would have to wait until after.

One of my modems indicate a high burst of CRC errors (maybe 500) and some ES on the 15 minute counter whenever I notice a drop.

As far as noise interference inside the house goes, I've done my best to eliminate that and switching off and on devices to see if anything happens, changed some lightbulbs around, using different surge protected extension lead now etc. No definite pattern to the drops that I can tell.

Any feedback? Many thanks :)

burakkucat:
Welcome to the Kitz forum.  :)

I think it might be best if you describe how the telephone line reaches your home and the sockets/wiring therein.

Do you have an aerial or an underground feed from the distribution point? Is there a junction box on an exterior wall? How does the cable enter your home? Through a hole in the wall? A door-frame? A window-frame?

How many sockets? What do they look like? Are they connected in series (i.e. like a daisy-chain)? Or from a central point (i.e. star-like)?

What form of filtering is used? A centralised filter (i.e. a service specific face plate (SSFP))? Or distributed micro-filters, one per socket?

I've probably forgotten to ask for other details but you can probably sense that any attempt at a remote diagnosis requires full knowledge of the existing infrastructure.

dslcrazy:

--- Quote from: burakkucat on March 21, 2019, 05:29:21 PM ---Welcome to the Kitz forum.  :)

I think it might be best if you describe how the telephone line reaches your home and the sockets/wiring therein.


--- End quote ---

Thanks for the welcome and the reply.

As far as cabling entering the property, I'm in a first floor upstairs flat where there is a junction box outside my window a couple of feet below it. From that box a cable rises from it and goes round to the outer wall and then into my property through the wall connecting to an NTE5c masterbox. Estimated 6-8 foot of what looks like black cat5e drop wire. Everythings looks OK there.

The cable on the other side of the junction box appears to run about 30 feet max along the building then the same wire type runs down into the soil of a flowerbed near the wall (nobody uses the flowerbed so I'm sure it's not damaged) where there's a nearby BT manhole cover. This runs in a straight line and there are a few smaller junction boxes along the way. The BT cabling does however run round the whole building but I look to have just 3 neighbors before me with little junction boxes inbetween.

Large square gray boxes with oval shaped covers just have cables running out the top and the bottom, like the one near my window, which seems to be used partly to get cables to the upper floor. The ones along the run between myself and the neighbors I would describe as a smaller star junction. No additional junctions between my NTE and the grey junction box outside my window.

My local cabinet is just over the main road by 35 feet max from my window on the left, but the external drop cabling runs 30 feet to the right as I said so it must go back on itself. Maybe 80 feet from the cabinet then? There are no overhead wires, all underground or on the side of the building as mentioned.

I don't have any extensions, various cables were tried, adsl filters swapped, currently just sitting in the test socket with a new ADSL dangle filter and cable that came with the technicolor router (also tested new cable/filter with other routers with no difference). Faceplates.. well, I have two openreach VDSL filtered faceplates since BT gave me a new one to replace the flat one, so aside from the flat one that's blown the faceplates appear to be fine.

The adsl and phone are BT wholesale.

1.3 Kilometers from the exchange according to one of the engineers.
down attention: 31.0
up attenuation: 16.3
Down SNR: 6 (9 doesn't help).
Up SNR: 5.4


--- Quote from: burakkucat on March 21, 2019, 05:29:21 PM ---I've probably forgotten to ask for other details but you can probably sense that any attempt at a remote diagnosis requires full knowledge of the existing infrastructure.

--- End quote ---

Yeah I get ya, I just didn't think to mention the cabling.

Last engineer did a pair quality test though and it didn't turn anything up. He was pretty thorough checking for adsl and phoneline faults too. So perhaps cabling is OK, even if obviously not perfect for me.

There is a slightly sinking BT manhole near the curb where a puddlesometimes forms. Engineer basically said it would drain off in guttering if it gets inside, and they'll often find joints are dry regardless of any problems with water getting in. Of course things are drying up now so I'm sure it wouldn't be as bad now and no more drops when it rains. Any thoughts on that?

dslcrazy:
Aside from that.. possible sources of interference are storage heaters inside the flats (just inside the outside wall so they're near the line running that way) but my own are fine afaict, communal lighting maybe since the flurescent tubes buzz a bit but they're not near my own external wiring really.

burakkucat:
Thank you for the description . . . and details of the tests that were performed.

I think we can rule out any obvious external wiring problems and internally you have the absolute minimum required . . . the incoming service feed going directly to an NTE5C (fitted with a SSFP).

Nothing comes immediately to mind. Let's see if anyone else has an idea.  :-\

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