Greetings NANOG'ers!
I have a small home lab which I mostly use for learning and testing. I'm
likely to receive some gear that needs negative 48VDC (ie: positive
ground). Mains is a typical 120VAC, 60Hz.
Can anyone recommend a power supply, reasonably priced, to go from 120VAC
down to -48VDC@10Amps? Something that fits in a two post rack would be
preferred, but not required.
Thanks,
Mark
Mark,
I'd recommend a Kepco PRR 48-22M. We have one in-office, used it for
some -48VDC equipment (Adtran Total Access gear) that we tested
in-office. Worked great, and can be found on eBay for under $400
-Bobby
Tellabs stuff seems to work reasonably well: I've got a model 8001 -48VDC
PDU in my lab rack at home, although it only supplies @ 1A, it does a fine
enough job for what I need.
Have a look at the Tellabs PS-1478 or so, which should do 10A. They're
not explicitly rackmountable, but look like they'd easily be adapted to
do so. You can still find PDF copies of Tellabs documentation online, too,
and I believe the PS-1478 should be floating ground like my 8001.
Hint: they can be had cheaply on ebay, since this is a home project,
after all. That's where I obtained my 8001. There is still one seller
around on ebay selling them for *way less* than $400, used.
-- Jonathan Towne
On Mon, Feb 03, 2014 at 01:08:28PM -0800, Robert Glover scribbled:
# On 2/3/2014 1:02 PM, Mark Leonard wrote:
# > Greetings NANOG'ers!
# >
# > I have a small home lab which I mostly use for learning and testing. I'm
# > likely to receive some gear that needs negative 48VDC (ie: positive
# > ground). Mains is a typical 120VAC, 60Hz.
# >
# > Can anyone recommend a power supply, reasonably priced, to go from 120VAC
# > down to -48VDC@10Amps? Something that fits in a two post rack would be
# > preferred, but not required.
# >
# > Thanks,
# > Mark
# >
I am using this:
http://www.newark.com/xp-power/jpm160ps48/psu-160w-48v-3-3a/dp/97K2572
Locally it is available here for about $50 USD as new. I found it in a shop
selling electronics for disco - don't tell them you are doing networks,
that info will multiply the price by 10 :-).
Regards,
Baldur
The output is changable from positive to negative ground by moving the
shorting bar to ground from the - output to the + side.
If you need to be able to charge a 48v battery plant you'd want the 60v version
instead, but it's more $. The 50v one works fine for benchtesting equipment,
at least.
-Will