Any ideas what this could be?

Hi everyone,

Just registered with the site but been a lurker for a while and picked up loads of very useful info, and hopefully posted this in the right place.

I've just recently moved from Essex down to Devon or to put it another way, 16Mb/s to 1.4Mb/s!!! OK, in all fairness, I knew about the connection well in advance of my move so I'm not complaining about that or the line figures.

I've had RouterStats Lite running continuosly more out of curiosity than anything, and for some reason the downstream noise drops by about 3-4db at 15:30 and rise to it's "normal" level at 23:00 every day - screenshot. The fall & rise in SNR has no effect on connection speed or throughput. I have asked Plusnet if they can throw any light on this but to no avail, so I'm asking all you nice people on here if you have any ideas.

Edited by deleted (Mon 05-Sep-11 18:16:08)

heating switch on?

In reply to a post by CID_Boy:

Hi everyone,

Just registered with the site but been a lurker for a while and picked up loads of very useful info, and hopefully posted this in the right place.

I've just recently moved from Essex down to Devon or to put it another way, 16Mb/s to 1.4Mb/s!!! OK, in all fairness, I knew about the connection well in advance of my move so I'm not complaining about that or the line figures.

I've had RouterStats Lite running continuosly more out of curiosity than anything, and for some reason the downstream noise drops by about 3-4db at 15:30 and rise to it's "normal" level at 23:00 every day - screenshot. The fall & rise in SNR has no effect on connection speed or throughput. I have asked Plusnet if they can throw any light on this but to no avail, so I'm asking all you nice people on here if you have any ideas.

Looks like R.E.I.N But as to the underlying cause/s could be lots of things, But if it is not causing the connection to drop or any other noticeable adverse affects ,then i wouldn't be too worried about it ,

In reply to a post by Anonymous:

Looks like R.E.I.N But as to the underlying cause/s could be lots of things, But if it is not causing the connection to drop or any other noticeable adverse affects ,then i wouldn't be too worried about it ,

No, Anon, that graph does not show any characteristics of REIN -- which would give a regular spiky appearance -- but some other noise event resulting in a drop of SNRM. (Perhaps a SHINE event?)

But, as you have said, if it is not causing a loss of sync or the PPPoA session, then the OP should just accept that it occurs.

A local shop on the route of your line - possibly a take-away that only works 5:00 pm to 10:30 pm ?

Hmmm, a few ideas...

If it's heating coming on somewhere - it's not ours and not our neigbours either, I've just asked and the reply was "What in this weather?"

In reply to a post by burakkucat:

...but some other noise event resulting in a drop of SNRM. (Perhaps a SHINE event?)

But, as you have said, if it is not causing a loss of sync or the PPPoA session, then the OP should just accept that it occurs.

I'm not bothered about it - I'm just curious as what it may be considering it's so regular.

As for a take-away - I wish, would be able to walk to it instead of drive!! Our nearest one is about 3 miles away in Exeter, the opposite way to the TE we're connected to...

Or some other business that works evenings only ?

Can you do a full RSL plot showing Up and Dn Sync and SNRs over a full 24 hour period with 30 second updates? and host the actual image rather than just a part of it.

Somebody's Sky box? Plasma TV? Local radio ham?

If it's Amateur Radio, then 'Top Band' (1.8 to 2.0 MHz) has frequencies within the top of the ADSL2+ spectrum.

All perfectly legal, as the operator is licenced by Ofcom.

Can you see any neighbour with a longish wire antenna up at roof level or higher?

Then, that might be the cause.

If you have overhead telephone cables it could magnify the problem as it could pick up the transmissions.

In reply to a post by G3UZF:

If it's Amateur Radio, then 'Top Band' (1.8 to 2.0 MHz)

No need to explain that to me, Adrian - I'm the really local ham (G7SYW - QRZ details are my old qth) and the nearest visible antenna is about 2 miles away

It is also too consistent to be caused by amateur radio transmissions ...

In reply to a post by MHC:

Can you do a full RSL plot showing Up and Dn Sync and SNRs over a full 24 hour period with 30 second updates?

Check this out, loads of plots (5 min periods), Excel spreadsheet, exchange maps (~2MB) zipped info

Had a problem on the line yesterday afternoon (completely dead line) so took the opportunity while disconnected to install the DGTeam firmware onto my Netgear DGN2000 - tweaked the noise margin down by a few db and almost doubled my connection speed with (so far) no errors

Edited by deleted (Tue 06-Sep-11 17:13:40)

Nothing obvious on those plots to suggest any strange burst forcing your speeds down. The late afternoon and evening drop is almost certainly something being turned on either in your property of close to the cables. You may need to walk to route back to the exchange to see if there is anything that might cause it.

73's G7SYV de G3UZF.

Bet that short opening message will confuse the posters!

Have been QRT for years now and no shack. Don't see any fun out of it anymore as the Internet and Skype etc do me well.

Also, saved thousands £££'s on not needing a transceiver, linear amplifier, tower, 3-element beam and crotchety neighbours complaining their TV receptiom is being bombed.

ARSK ..

Adrian
G3UZF

In reply to a post by G3UZF:

73's G7SYV de G3UZF.

Bet that short opening message will confuse the posters!

Have been QRT for years now and no shack. Don't see any fun out of it anymore as the Internet and Skype etc do me well.

Also, saved thousands £££'s on not needing a transceiver, linear amplifier, tower, 3-element beam and crotchety neighbours complaining their TV receptiom is being bombed.

ARSK ..

Adrian
G3UZF

Glad to see you did not use 88's

In reply to a post by G3UZF:

73's G7SYV de G3UZF.

Bet that short opening message will confuse the posters!

Have been QRT for years now and no shack. Don't see any fun out of it anymore as the Internet and Skype etc do me well.

Also, saved thousands £££'s on not needing a transceiver, linear amplifier, tower, 3-element beam and crotchety neighbours complaining their TV receptiom is being bombed.

ARSK ..

Adrian
G3UZF

Hi-hi OM...

I've recently gone QRT as well, the shack went about 3 yrs ago shack pic, was just running an 857 mobile when I moved here but that's now gone....
It's my partners house so I knew before moving there's no chance of a tower or much else here - that nice wooden pole with the overhead electric cables at the end of the short back garden has ruled setting up a shack

-.-

Rod...
G7SYW