[ale] How to test a cat5 wire?

[Christopher Hagler]

I don’t know much about the POE stuff as I am just learning all of that stuff myself. However, you can get a DMM (Digital Multimeter) and test for the continuity in the wires. I think this videos shows how to do a continuity check on a cat5 cable https://youtu.be/Sphe1oBnQd8

Sent from my iPhone

> On Aug 15, 2019, at 7:08 PM, Derek Atkins via Ale <ale at ale.org> wrote:
> 
> 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
> 
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