Cambium sells a "carrier PoE" for the 450 that will accept -48v input.
I think the PMP450 normally does not run on -48.
On 11/24/2018 12:09 PM, Ken Hohhof wrote:
Some WISP equipment like Packetflux started with +24V and extended the
voltage range so now it can be powered via +48/56V.
It’s a little difficult to pin down some radios, it seems like most
802.3af equipment is actually floating and as long as you observe
polarity, either side of the power supply can be grounded.
Documentation usually doesn’t say. Also some Mikrotik equipment may
say -48V in the spec sheet but the terminals are just labeled + and –
and seems to be floating just like 802.3af. Cambium/Ceragon has a DC
powered POE that seems happy with +24, -48 or +48 input. My belief has
always been that Cambium radios like 450i and 450m want +48V POE but
maybe they don’t care. The Cambium POE brick actually has a 2 pin AC
power cord and no ground terminal, implying that the power source can
be floating. I wish manufacturers weren’t so vague about this.
*From:* AF <[email protected]> *On Behalf Of *Chuck McCown
*Sent:* Saturday, November 24, 2018 9:41 AM
*To:* AnimalFarm Microwave Users Group <[email protected]>
*Subject:* Re: [AFMUG] 48v Power Supply Switches
I guess my experience is the reverse. Having spent 40 years in
telecom, seems that almost everything rack mounted is –48 if you want
DC power. I don’t recall ever finding +48 rack mounted telecom
equipment.
*From:*Ken Hohhof
*Sent:*Saturday, November 24, 2018 7:43 AM
*To:*'AnimalFarm Microwave Users Group'
*Subject:*Re: [AFMUG] 48v Power Supply Switches
I have one site with an Eltek/Valere system and it does its job quite
nicely, my question for you: how do you deal with the Eltek Systems
mostly being designed for -48 yet a lot of the equipment ISPs use
wants +48? My one Eltek site has an old Purewave WiMax basestation
that I am about to decommission but I will need +48 and I don’t want
to put in a DC-DC converter if nothing will be running off the -48.
*From:*AF <[email protected] <mailto:[email protected]>>
*On Behalf Of *Chuck McCown
*Sent:* Saturday, November 24, 2018 8:13 AM
*To:* AnimalFarm Microwave Users Group <[email protected]
<mailto:[email protected]>>
*Subject:* Re: [AFMUG] 48v Power Supply Switches
+1
Sent from my iPhone
On Nov 24, 2018, at 3:13 AM, Gino A. Villarini <[email protected]
<mailto:[email protected]>> wrote:
We go direct to Eltek/valere -48 system. It has redundant
rectifiers, web/snmp and LVD
*Gino****Villarini **
*Founder/President
@gvillarini
t: 787.273.4143
m:
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*From: *AF <[email protected]
<mailto:[email protected]>> on behalf of Alex Davidson
<[email protected] <mailto:[email protected]>>
*Reply-To: *AnimalFarm Microwave Users Group <[email protected]
<mailto:[email protected]>>
*Date: *Friday, November 23, 2018 at 11:13 AM
*To: *"[email protected] <mailto:[email protected]>" <[email protected]
<mailto:[email protected]>>
*Subject: *[AFMUG] 48v Power Supply Switches
Hey guys, we are stepping up to some 48v equipment on a tower and
in looking into power supply switches. This seemed to be something
that would work for us (Mean Well SE-1000-48). Any thoughts or
pros and cons that yall have found with this unit. Any units of
similarity that might work well in place of this one. Thanks
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