[ale] How to test a cat5 wire?

[Derek Atkins]

HI,

I am renovating my house and pulling lots of wire.  I pulled some Cat5e
for some in-house PoE IP Cameras and one wire appears to have been clipped
by the mudders.  They ripped the outside insulation and appear to have
nicked one of the wires -- looks like the blue.  Doesn't look like the
broke the wire, just grazed it.  Unfortunately they did it just where the
cable exits the wall, with no slack inside the wall (but a good 10-20 feet
rolled up outside, past the nick!  OOPS).

I know my cameras are only 100mbps.

According to https://en.m.wikipedia.org/wiki/Power_over_Ethernet it looks
like PoE with 100BaseT may leave the blue (and brown) wires unused, if
it's using mode PoE A.  How do I know what PoE mode the switch (a Unifi
US-48-750) and my camera will use?

In a related note, what is the best way to test if the wire is still okay
or if it got sliced?  I can't tell by looking at it.  It doesn't look cut,
just a bit stripped.

Any suggestions (short of asking my contractor to re-run the cable?)

-derek

PS: Linux related because I am running zoneminder on a linux box :)

-- 
       Derek Atkins                 617-623-3745
       derek at ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant