Re: Testing for RFI which may be causing intermittent broadband problem
- From: "marky" <markyr@xxxxxxxxxxxxxx>
- Date: Sun, 20 May 2007 00:37:52 +0100
tune a mw radio into mw 612, best done with a portable or car radio, drive
past your house when you suspect the interference, you will get a loud hum
if radio/electrical is causing the problem,but then you have the problem of
, eg the interference is coming from a house 3 doors away, convincing them
they have something causing this, I have come across faulty wireless routers
and TV sets knocking out a whole row of houses, also something else to look
out for is garden lights that come on at dust.
Marky
"Mortimer" <me@xxxxxxxxxxx> wrote in message
news:464e0140$0$8731$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I'm having frustrating ADSL problems (see below). Someone mentioned using
a
MW radio to listen for interference, since ADSL uses similar frequencies.
Is
there any particular frequency that I should tune the radio to? If
interference occurs, will it be reasonably obvious by listening?
The problem
-------------
My Netgear router contines to go into stupid mode intermittently:
- inability to browse or read email
- failure to do DNS domain->IP lookup
- can still ping external address by IP
- router still showing a connection; no information in log file
- downstream noice margin is all over the place (a constant 15 dB drops to
between 5 and 10 dB, changing every few seconds); no other parameters than
downstream margin change
- router's DSL light flickering furiously with no corresponding Ethernet
or
wireless light activity
- does not cure itself spontaneously: need to unplug DSL lead for a few
seconds (or reboot router)
When it's working, router stats are typically
ADSL Link Downstream Upstream
Connection Speed 8128 kbps 448 kbps
Line Attenuation 5.0 db 2.5 db
Noise Margin 15.4 db 24.0 db
Voice reception is fine: no hiss, distortion or crackle.
Having eliminated DSL cable, microfilter, house wiring (I'm currently
plugged into the test socket via BT-to-RJ11 cable), I'm wondering what's
left. My ISP has done a test from their end and can't find any problem.
All this started suddenly a few days ago, having worked faultlessly for
three years. I'm not aware of anything in the house or with my computers
which has changed.
The problem always happens in the evening - after about 7PM and invariably
happens sometime while I'm asleep: every morning I wake up to find it in
silly mode. The interval between problems is very variable, ranging from 5
minutes to several hours between occurences. It's never happened between
0800 and 1900.
I have tested with my DECT phone base-station switched off at the mains
(as
well as being unplugged from the phone line)
Either the router has started to fail or there's an intermittent DSL
problem
or there's RFI from something.
By the way, would you expect the router to lose sync and then recover
spontaneously every time any other microfilter (even one with nothing
plugged into it) is plugged/unplugged? As I was unplugging or replugging
filters during my earlier testing, I noticed this symptom. It's different
from the stupid mode failure in that the DSL light actually goes out and
then flashes orange as it re-trains, rather than flickering green.
.
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