Re: [Linux-users] Linux-users Digest, Vol 68, Issue 3

[Robert Fisher]

Some of Criggie's comments are redundant for the latest available RJ45
plugs and crimp tools.

The new type come with a little insert which easily allows each of the 8
conductors to be inserted separately then pulled through tightly. This
"insert" with all conductors in the correct order is then easily inserted
into the body of the plug and crimped.

I am not sure if it means that you need a special crimp tool or not but I
have used my son's crimp tool with the new type of plug and wished it was
invented years ago.

Rob

On 7 March 2016 at 13:23, Criggie  wrote:

> >  I was once detailed to make ethernet cables. They worked, initially.
> >Later they failed.
> >There was some sadness, cause failure mode was intermittent failure. .
> >  My suggestion is that you take Hadley's approach::
>
>
> Having done cable monkey stuff for a long time, there are some flaws and
> some things should be clarified.
>
>
> Making your own cables is perfectly okay, as long as you do it right.
> This means using a crimping tool, not a screwdriver.
>
> It also means using the right plugs for the style of cable you use.
> For patch cables that means stranded cable and stranded-compatible plugs
>
> Don't ever use solid core ethernet cable for patch leads, not ever.  They
> work for a bit but degrade over time due to movement.  Solid core is fine
> for in-wall installations where it will not move ever, and its a little
> cheaper.   Don't kid yourself that your "patch leads rarely change"  This
> is a false economy.
>
> Do get a tester too - they show pair-flips and when a link is
> disconnected.  Very handy, expecially the near and remote units so you can
> test a cable where the ends are not close together.
>
> Get a proper stripping tool too - these cost under $10 and save so much
> hassle.
>
> Expect to bugger up a bunch of plugs getting the trim lengths correct.
> Yes they're magic and the wires move in the plug between insertion and
> crimping.  Check them before crimping.
>
> If doing the shortening thing then consider that some cables are wired
> with different colour schemes.  They are compatible if you use the same
> colour coding on both ends.
>
> Get yourself a colour cheat card too - and reference it.  Is easy to go
> wrong and noone likes redoing work.
>
>
> The cost of all the tools means its probably not financially feasinible
> for ones or twos, but tools are for life and I personally don't regret
> dropping several hundred dollars on the gear over 10 years ago.
>
>
> Finally - Don't overload the RJ45 connector.  I understand you're not
> putting ethernet over this - but what happens if someone connects their
> computer, or worse plugs one of these leads into a switch?   Definitely
> label them clearly, and if you can afford to look at colour-coded wall
> jacks and plugs.
>
> ** I have seen a "Power Over Cat5 spare pairs" bodge connected to a
> switch.   Amazingly it kinda worked, but fried a couple weeks later.
>
>
>
> --
> Criggie
>
> http://criggie.org.nz/
>
>
>
> ___
> Linux-users mailing list
> Linux-users@lists.canterbury.ac.nz
> http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
>



-- 
Robert Fisher
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Re: [Linux-users] Linux-users Digest, Vol 68, Issue 3

[Criggie]

>  I was once detailed to make ethernet cables. They worked, initially.
>Later they failed.
>There was some sadness, cause failure mode was intermittent failure. .
>  My suggestion is that you take Hadley's approach::


Having done cable monkey stuff for a long time, there are some flaws and
some things should be clarified.


Making your own cables is perfectly okay, as long as you do it right.
This means using a crimping tool, not a screwdriver.

It also means using the right plugs for the style of cable you use.
For patch cables that means stranded cable and stranded-compatible plugs

Don't ever use solid core ethernet cable for patch leads, not ever.  They
work for a bit but degrade over time due to movement.  Solid core is fine
for in-wall installations where it will not move ever, and its a little
cheaper.   Don't kid yourself that your "patch leads rarely change"  This
is a false economy.

Do get a tester too - they show pair-flips and when a link is
disconnected.  Very handy, expecially the near and remote units so you can
test a cable where the ends are not close together.

Get a proper stripping tool too - these cost under $10 and save so much
hassle.

Expect to bugger up a bunch of plugs getting the trim lengths correct.
Yes they're magic and the wires move in the plug between insertion and
crimping.  Check them before crimping.

If doing the shortening thing then consider that some cables are wired
with different colour schemes.  They are compatible if you use the same
colour coding on both ends.

Get yourself a colour cheat card too - and reference it.  Is easy to go
wrong and noone likes redoing work.


The cost of all the tools means its probably not financially feasinible
for ones or twos, but tools are for life and I personally don't regret
dropping several hundred dollars on the gear over 10 years ago.


Finally - Don't overload the RJ45 connector.  I understand you're not
putting ethernet over this - but what happens if someone connects their
computer, or worse plugs one of these leads into a switch?   Definitely
label them clearly, and if you can afford to look at colour-coded wall
jacks and plugs.

** I have seen a "Power Over Cat5 spare pairs" bodge connected to a
switch.   Amazingly it kinda worked, but fried a couple weeks later.



-- 
Criggie

http://criggie.org.nz/



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Re: [Linux-users] Data cable

[Derek Smithies]

Hi,
 I was once detailed to make ethernet cables. They worked, initially. 
Later they failed.

There was some sadness, cause failure mode was intermittent failure. .

 My suggestion is that you take Hadley's approach::

On 06/03/16 20:20, Hadley Rich wrote:


You can get pre-made patch leads in most lengths.



Hadley's approach should save you much grief..


Cheers,
 Derek.

--
Sent from my Ubuntu computer

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