[ale] How to test a cat5 wire?

[jim.kinney at gmail.com (Jim Kinney)]

Best bet is to buy a cable tester. Barring that, use a radio and make an adapter with alligator clips that uses the earphone jack as a signal source and a speaker on the other end.

If a single wire is damaged and your connection doesn't require 8, just swap a pair of unused for damaged on both ends. Electrons are color blind ?. Some labels explaining the change will help for later.

It may be possible to use the damaged wire bundle to pull a new cable. Plenum rated wire is tough and easy to pull. 

On August 15, 2019 8:08:47 PM EDT, 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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