cancel
Showing results for 
Search instead for 
Did you mean: 

Does this look like electrical interference?

Community Veteran
Posts: 2,344
Thanks: 238
Fixes: 2
Registered: 04-08-2009

Does this look like electrical interference?

Attached is a Routerstats graph of Errored Seconds for 15 minute periods (just captured). The ES rates are running phenomenally high at getting on for one a second. Normally the ES rate is around 10 per 15 minutes.
This tends to happen at lunchtimes (recently) and almost always between 4pm and 6pm. Because the line is a steady rate of increase it looks like constant interference to me. Anyone agree or suggest anything else?
The line is rock solid (except I've just rebooted to see if it made any difference, which it didn't) and holds around 3bB SNRM, synced at 13Mbps.
5 REPLIES
Community Veteran
Posts: 2,344
Thanks: 238
Fixes: 2
Registered: 04-08-2009

Re: Does this look like electrical interference?

Sure enough, after lunchtime it disappears!
Community Veteran
Posts: 6,313
Thanks: 86
Fixes: 3
Registered: 08-01-2008

Re: Does this look like electrical interference?

Almost certainly interference, problem will be finding the source.
Call me 'w23'
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Plusnet Alumni (retired) chrispurvey
Plusnet Alumni (retired)
Posts: 5,369
Fixes: 1
Registered: 13-07-2012

Re: Does this look like electrical interference?

This list is not exhaustive but common culprits could be:
•  A current imbalance between two power carrying conductors (Earth leakage fault).
•  Faulty thermostats (Central heating, Immersion heaters).
•  Electrical power supply units (Laptops, Routers, Plasma TVs).
•  Industrial/Commercial power usage (Electric Railways, Electric fences, Electric motors).
•  Decorative electrical items (Christmas tree lights, Touch lights).
•  Security systems (PIR lights switching on and off).
•  Digital Communication Receivers (Satellite and Freeview set top boxes).
•  Internal power and telecoms cables run close together at the End User
It can be a pain to locate, but the list does provide the most common ones.

Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: 18-07-2007

Re: Does this look like electrical interference?

I was just about to post something pretty much exactly as above. You could try the AM radio trick (tune to 612MHz to pick up interference as per http://www.kitz.co.uk/adsl/rein.htm) but that's not particularly accurate, might be worth a go though. Might also be worth asking your neighbours if they're seeing similar issues to see if it's affecting things over a wider area?
Community Veteran
Posts: 2,344
Thanks: 238
Fixes: 2
Registered: 04-08-2009

Re: Does this look like electrical interference?

Thanks folks!  Smiley