> They draw 200ma each at 9 volts. I made up my own wire harness with
> barrel plugs spaced along it for the modems. You could get by with a
> fixed voltage supply with no meters for less if you can use 13 volts.
Seems that Cardinal (Rockwell based) run anywhere from 9 to 15V just
fine. I'm using a 230W power supply that I had laying around as a
backup (gotta get a new backup) hooked up through (of all things) a
model-66 50-pair punchdown block. Works great. Each of the Cardinal
MVP288XF modems draw about 145Ma maximum, so I can probably get away
with 40 w/o overload (the power supply is rated for 9A steady at 12V)..
> This power supply is loafing at less than 4 amps, and there is only
one
> plug in the wall! On a 35 amp supply, you could power about 150+
modems.
> That works out to less than $1 per modem as the supplies are about
$150.
Mine comes up to be (if I was to put say 32 modems on it) to
$1.10/modem, that's paying Radio Shack prices for the plugs and wire
(*ugh* - their plugs STINK, I'm going mail order next time)..
> The down side is, if the power supply dies, so do all your modems. I
> don't think that is to likely though. If it does die, you will hear
about
> it real soon!
true... I'm going to split mine as soon as I get more lines onto two
supplies. I'm trying to get GTE to do a random hunt thing, so I won't
be completly offline.
> By the way, don't worry if your wall transformer puts out AC. Give
the
> modem DC anyway, as the first thing the modem does is pass it through
a
> rectifier, and change it to DC anyway. The modems run cooler too if
you
> give them just enough voltage to operate. You might need to
experiment a
> little to find out how much is needed.
depends on the modem (or any electronics). I've dealt with voltage
regulators that went nuts (occilation, etc) with too low a voltage
supplied.
JS