Broadband Related > Broadband Technology
Radio Detection Of REIN.
tickmike:
Radio Detection Of REIN. (Repetitive Electrical Impulse Noise).
Yesterday I did a survey of interference following the cable route, as previously confirmed by an Openreach technician all the way from my house to the exchange 4.5kl away.
Using a medium wave radio set to 612kHz, I had only gone 350 Mts and picked up some quite strong signal and the next, a very, very large signal was just around the corner from the exchange some 4.2kl away.
My isp have been trying different things to improve my line but have said they will arrange an Openreach technician to start doing tests then hand it over to the REIN investigators. :hmm:
Edit.. I also noted a radio transmitter mast about 3.9 kl away next to the cable route, trying to find out what it is used for (it used to be a lighting company ) Could be a mobile phone booster station.
Edit.. It Is.
aesmith:
Out of interest do you know why people are advised to check at that particular single frequency? For example looking at my own line there doesn't seem to be a dip at that frequency, nor any bit swapping. On the other hand at other frequencies there are quite marked "holes" in the bit loading.
tickmike:
I think it's a quite part of the band although I did have to move to 615kHz as a french station came up during my tests.
roseway:
--- Quote ---Out of interest do you know why people are advised to check at that particular single frequency?
--- End quote ---
Possibly because that's the frequency used by the test gear which Openreach use. Another possible reason is that there aren't any UK medium wave radio stations operating near that frequency. REIN tends to be wideband in nature, so the exact frequency doesn't matter much.
Narrow dips in the bitloading aren't likely to be REIN. They are often caused by strong MW radio stations, and you can check yours here: http://www.mediumwaveradio.com/uk.php
tickmike:
As Eric says 612kHz is used by BT.
https://www.btwholesale.com/assets/documents/Orders_and_Faults/REIN_Introduction_for_CPs_v10.pdf
http://www.kitz.co.uk/adsl/rein.htm
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