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Just thought I'd drop a note saying my two Ligowave PTP5-Unity radios are happily rolling on 48V low. The mfg support long ago said they don't recommend passive poe but we're rolling along on two production units now, less (wall) warts = more good !

how many watts does it draw?
Is it GB or 100MB Ethernet?

Can you test the injector and see what pins it normally uses?

They are 802.3at/f standard for wiring, linked at Gig and running 8ish watts on the 10km hop and 11-12watts on the 60km link

rockhead wrote:They are 802.3at/f standard for wiring, linked at Gig and running 8ish watts on the 10km hop and 11-12watts on the 60km link

Keep an eye on the watts consumed but as long as it is below 25 watts consistently you're OK to use the normal 48V ports, but if you are going to power a device that uses 802.3af/at which normally uses all 4 pairs or a passive POE device like airFIBER that also uses all 4 pairs to supply power then you need to use the special 48VH ports which are ports 1-2 on B models and ports 1-4 on A models.

If you consume more than 25+/- watts consistently using the standard 48V setting then you at the upper limits of Ethernet transformer and the recommend current load of the poly fuse. It does not hurt to spike above that a little for short periods.

When powering 24V devices you do not want to pull more than say 12 watts consistently. It does not hurt to spike above that a little for short periods.

Just wanted to verify that it's safe to power Ligowave PTP 5-N Unity radios with a Netonix 48V port, since the OP mentioned PTP5 Unity, not 5-N Unity. I'm pretty sure their power requirements are the same - just hoping someone might be able to confirm.

Also, re: sirchc's post:

If you consume more than 25+/- watts consistently using the standard 48V setting then you at the upper limits of Ethernet transformer and the recommend current load of the poly fuse. It does not hurt to spike above that a little for short periods.

You mean you shouldn't be consuming more than 25 watts on a single 48V port, as opposed to all ports combined, right?

Kevlar wrote:Just wanted to verify that it's safe to power Ligowave PTP 5-N Unity radios with a Netonix 48V port, since the OP mentioned PTP5 Unity, not 5-N Unity. I'm pretty sure their power requirements are the same - just hoping someone might be able to confirm.

Also, re: sirchc's post:

If you consume more than 25+/- watts consistently using the standard 48V setting then you at the upper limits of Ethernet transformer and the recommend current load of the poly fuse. It does not hurt to spike above that a little for short periods.

You mean you shouldn't be consuming more than 25 watts on a single 48V port, as opposed to all ports combined, right?

Our newer Rev Boards tell you .75A @ 48V so that is 36 watts at 48V on a standard 48V port. If you are running up to date firmware the UI tells you what the power rating is on each port.

Some devices like AF24 use 48VH which is power on all 4 pair so it can deliver 1.5A 72+ watts @ 48V.

Now keep in mind what we call 48V in UI is actually 50V, we just called it 48V so people without a lot of knowledge would be more comfortable as they are familiar with 48V POE.

NEVER use 48VH on a device unless you first verify it accepts power on all 4 pair and that each pin polarity matches the device requirements.

Also never power a HIGH power device like airFIBER 24 with standard 48V on 2 pair as you will damage the port and possibly the device as you are forcing too many watts across a single pair in the Ethernet Transformer and you will damage it.

THere is a thread where people report what devices they have used with our switches viewtopic.php?f=6&t=1215