Voltage confusion on the WS-24-400A

[jbaird]

The specs on the website say:

24V .75A - Ports 1-4
24V .5A - Ports 5-24

However, the interface on our switch says differently. It says that all 24 ports are 24V/.75A. Which is correct?

Also - why does this model not have any 24VH 1.5A ports like the 12 port models? I also noticed that the 12 port models have 48VH 1.5A ports, and the 24 port model is only 1.2A.

[lligetfa]

What board rev? The early models had .5A poly fuses on the ports. The latest have .75A. None of the early models had 24VH. That was added later.

My rev B WS-24-400A has .5A poly fuses and no 24VH. My rev D WS-6-MINI has .75A fuses and 24VH.

[sirhc]

THere are different Revs of the board:

Rev A - was prototypes not many sent out to BETA guys
Rev B - was early batches not many sent out
Rev C - was first real full production batch
Rev D - was increased polyfuse ratings
Rev E - just now shipping has a minor resistor change no change to user function

Look in PDF page 4 http://store.netonix.com/media/wysiwyg/ws-specsheet.pdf

I should update web page to reflect current rev boards but this is why we put the POE port rating in the UI so the end user knows what each port is rated at regardless of the board rev.

The UI displays the correct rating. Now mind you that is the rating at 55C, you need to read about how poly fuses work (not an exact science) which is why I say never plug in LIVE POE ports because chances are the switch is not in a 55C environment and poly fuses will surge well above rating so if you have a short you will blow your Ethernet transformer.

We put in the highest rated transformers we could find and they will not survive a dead short at room temperature, if the switch is sitting in a room that is 55C they should survive. This comes down to rather you want us to size polyfuses for HOT environments which leaves your transformers at risk or size them to protect the transformer and they trip in hot environments.

[jbaird]

Ok - thanks for the explanation. All of mine are RevD.

[sirhc]

What board rev? The early models had .5A poly fuses on the ports. The latest have .75A. None of the early models had 24VH. That was added later.

My rev B WS-24-400A has .5A poly fuses and no 24VH. My rev D WS-6-MINI has .75A fuses and 24VH.

The WS-24-400A or B does not support 24VH only the newer models support 24VH but we may remove this in the future since UBNT once again changed their radios POE requirements (AFX). Now the new AFX radios will support 24V (proven at 200'+/- cable), 24VH, 48V, 48VH