[RFI] Re-wiring station

[Robert Nobis]

Ken,

As I recall, the CAT5 or CAT6 specifications do not actually specify that each pair have a different number of twists per inch. They do specify that all pairs be less than 38mm per twist and that pair twist lengths shall be chosen to ensure compliance with the transmission requirements of the standard. In practice, I believe manufacturers are using different twists per inch on the wire pairs in order to meet the specifications for cross-talk. 

At any rate, I don’t believe the original question was concerning Ethernet cable.

Reference https://www.physicsforums.com/threads/cat6-versus-cat5.246719/

73,


Bob Nobis 
n7rjn at nobis.net


> On Dec 30, 2016, at 20:22, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
> On 30 Dec 2016 at 19:33, Robert Nobis wrote:
> 
>> I have never seen anything on number of turns.
> 
> I have: with regard to CAT-5 cable. The number of turns varies between pairs in order to 
> reduce cross-talk between pairs.
> 
> I cannot remember where I saw this, but I was an IT Professional for over 30 years.
> 
> Maybe if we looked in the computer networking field.
> 
> Ken W7EKB
> 
> 
> 
> 
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