[TriLUG] Slightly OT: network switch question

[Wes Garrison via TriLUG]

Joe,

Can you explain what you mean by "re-inserted"?

Re-inserted into what?

If you mean "punched down", you certainly need to re-strip and re-punch the
solid core cable further down, discarding the previously punched-down ends.

You aren't supposed to punch down stranded cable, as the IDC (Insulation
Displacement) cuts through the strands of the wires.  It will "work", but
it's not a good idea.

You *can, *however crimp an 8P8C connector onto both solid and stranded
cable, provided you use the correct connector for the application.

An 8P8C connector for solid cable has 3 "fingers" that displace the
insulation on the cable when crimped, so that the outer two fingers are on
one side of the conductor and the middle finger is on the other.

Here is a picture of the middle finger
<https://cdn.shopify.com/s/files/1/1061/1924/products/Middle_Finger_Emoji_894a7ecd-277f-479e-9967-44d20813a2d6_large.png>

Here's a better pic
<https://sc02.alicdn.com/kf/HTB1QAJoXY9YBuNjy0Fgq6AxcXXa2/cat-7-rj45-connector-RJ45-shielded-modular.jpg>

An 8P8C connector for stranded crimping often has only 2 fingers and can
penetrate the insulation of the conductor directly instead of using
insulation displacement on the sides of the conductor.

-Wes




_________________________________
Wesley S. Garrison
Network Engineer
Xitech Communications, Inc.
phone:  (919) 260-0803
fax:       (919) 932-5051
__________________________________
"Lead us not into temptation, but deliver us from email."

On Wed, May 16, 2018 at 12:20 PM, Joseph Mack NA3T via TriLUG <
trilug at trilug.org> wrote:

> On Wed, 16 May 2018, Bill Farrow via TriLUG wrote:
>
> When a single wire in a twisted pair is broken it may still work,
>>
>
> be aware that (the cheaper) solid conductor cable is not meant to be
> reinserted. You punch it down and never move it. Reinserting (ie bending)
> solid conductor cable will eventually result in cracks in the conductor
> which will give erratic and hard to diagnose conditions.
>
> Any cable that's reinserted has to be (the more expensive) multi stranded
> cable.
>
> The OP mentioned that the problem occured after a cable was disconnected
> and reconnected. I would first suspect that solid core ethernet cable was
> involved.
>
> You can check which the cable is: multistranded is floppy and cannot
> support its own weight; solid core can partially support its weight - a
> foot or so of it will not bend.
>
> Joe
>
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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