Re: -48VDC supply for home lab?
I use: http://www.mastechpowersupply.com/dc-power-supply/switching-power-supply/volteq-power-supply-hy5020ex-50v-20a-over-voltage-over-current-protection/prod_61.html 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 On Mon, Feb 03, 2014 at 02:02:11PM -0700, Mark Leonard wrote: > Date: Mon, 3 Feb 2014 14:02:11 -0700 > Subject: -48VDC supply for home lab? > From: Mark Leonard > To: "North American Network Operators' Group" > > 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
Re: -48VDC supply for home lab?
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 On 3 February 2014 22:02, 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 >
Re: -48VDC supply for home lab?
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 # > # # 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 #
Re: -48VDC supply for home lab?
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 > 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
-48VDC supply for home lab?
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
