Importance of power supply....
- From: "Mark Rogers" <mark-news@xxxxxxxxxxxxxx>
- Date: Thu, 8 Sep 2005 11:01:06 +0100
Just got back from customer. Their previously working ADSL setup stopped
working a couple of weeks ago. The router was reporting reasonable (not
exceptional) SNR/attenuation figures,, but it could not attain reliable
Today, we swapped everything - router, filter, cables, etc - and it worked
fine. We then reverted step by step back to the old hardware to find out
what was wrong, and it still worked.
Only when I went to rebox the replacement router did I realise we'd
accidentally left the old router using the new PSU. Switching back to the
old PSU broke the connection consistently. We'd found our fault.
The odd thing is that the working PSU was only 7.5v (1.5A), where the
original PSU was 12v (1A). (I don't know what sort of internal voltage these
things run at? I guess a lot of the 12V is dropped across a voltage
The other odd things is that replacing the cheap (eBuyer) filter with a
decent (Excelsus Z-420UKP2J) one actually gave slightly worse SNR figures,
although with the correct PSU both filters worked fine.
In all the advice I've heard here recently nobody that I noticed mentioned
the PSU, so I thought it worth mentioning.
[I now have a new router without a PSU - where's a good source of cheap but
reliable 12V PSUs?]
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