On 03/04/18 00:51, Dave Liquorice wrote:
On Mon, 2 Apr 2018 00:31:25 +0100, Tim Watts wrote:

I've got their 16 port PoE+,

Is that real IEE802.3af or IEE802.3at PoE? Some Ubiquity "PoE" is
passive 24 V DC straight onto pairs of the cable with no interlock.
This put me off Ubiquity kit a year or so ago, far to easy to give
somethinga 24 V surprise and let the magic smoke out.

802.3at+af but the ports *can* be programmed for 24V passive - something
I'm keen to avoid for similar reasons (more to do with cable faults
blowing the polyfuse in the port which can happen, as reported by
someone on a forum).

One of the cams is actually 24V passive, but comes with an inline
converter to 802.3af - which at least means consistent settings on the
switch and I put the converter near the end device.

In theory, as I understand it, all PoE (including passive) put DC
*between pairs* rather than across wires in a pair, so really, nothing
should be going bang as the isolating transformers in any given device
will provide decent inter-pair isolation:

https://www.alliedcomponents.com/ite...R14-3682-2.jpg

and 24V is on the low side for things expecting power.

Or am I missing something?

I did put 24V onto the af side of the inline converter to see if bad
things might happen and in that case, they didn't.

The main reason I prefer to avoid it is the risk of the cable
(installation) cable being damaged and blowing the port.

But I would certainly suggest it to Ubiquity, to have a master config
setting that says "only PoE+ or nothing".


Next plan is to get a 19" wall cabinet in somewhere with a patch panel,
drop some permanent Cat6a cables

Cat5e will run Gigabit and is easier to handle than Cat6...

Yes indeed - but for installation cable, I'm going for future proofing
Mac Pro's already come with 10000baseT ethernet - it's not that far
over the horizon that we'll all be saying "pah - gigabit???".


(I fancy the look of the Excel keystone toolless jack system) and mount
up this switch properly

How do you terminate the cables without a tool? Either to fit an RJ45
to plug into the keystone or to strip back the jacket to arrange the
wires correctly into some other connection on the keystone?


They mean no special crimping or punchdown tool. I think strippers are
allowed