[Elecraft] RJ45

[Dale Putnam]

Hi Dave,
  Your logic seems correct on the surface, however the CAT5 standard also states the number of twist per pair, 
and the placement of the different twists, on the ends also contribute to the minimizing of "crosstalk".
If you aren't attempting to be strict to the standards, then any wiring will work on the jacks.. understanding that signal attenuation, and crosstalk, and capacitance between pairs, and inductance between pairs, will be affected, such that the nominal signal attenuation, as stated for 100ft, will not be attained. 

Have a great day,
--... ...-- Dale - WC7S in Wy


________________________________________
From: Elecraft <elecraft-bounces at mailman.qth.net> on behalf of David Robertson <kd1na363 at gmail.com>
Sent: Monday, May 9, 2016 7:55 AM
To: kenin.stover at mediacombb.net; Elecraft
Subject: [Elecraft] RJ45

Kevin,

Thanks for the information on the RJ45 standards. what confuses me is there
are 6 pair of wires in a CAT 5 cable. In the standards you list, the only
difference is the placement of the Orange/Orange-White and
Green/Green-White pair of wires.

As long as you maintain the same standard or a standard you create on BOTH
ends of the CAT 5 cable this cable could be used anywhere, regardless of
the system used. I understand that maintaining a standard of wire color
codes is important for tracing and troubleshooting purposes.

From: Kevin Stover <kevin.stover at mediacombb.net>
To: elecraft at mailman.qth.net
Cc:
Date: Mon, 2 May 2016 18:50:46 -0500
Subject: Re: [Elecraft] K3S RJ-45 Pin Alignment
The standards go thusly.

TIA/EIA 568-A (T568A)

Pin 1 - white / green stripe

Pin 2 - green

Pin 3 - white / orange stripe

Pin 4 - blue

Pin 5 - white / blue stripe

pin 6 - orange

pin 7 - white / brown stripe

pin 8 - brown


TIA/EIA 568-B (T568B)

Pin 1 - white / orange stripe

Pin 2 - orange

Pin 3 - white / green stripe

Pin 4 - blue

Pin 5 - white / blue stripe

Pin 6 - green

Pin 7 - white / brown stripe

Pin 8 - brown


--
Dave Robertson KD1NA
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