What does A and B stand for...

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 Question by Hugo Maldonado posted 03 Jul 2000
 What does A and B stand for...

What does A and B stand for in T568A and T568B wiring method for RJ-45 CAT 5 network cables?

What does ACT, and COL stand for in the status lights of a NIC?

 Answer by Dmitri Abaimov posted 07 Jul 2000
Dear Hugo,

I believe 'A' and 'B' are there only to differentiate one from another :-) Or maybe to show that the 'A' option came first and/or is preferred as per TIA/EIA-568-x.

There is a page on this site that describer both wiring schemes: http://www.cabling-design.com/references/pinouts/t568ab.shtml

'ACT' on the NIC stands for link integrity check. Suppose to be no light or red/yellow when there is a problem.
'COL' stands for collisions. May be used as a rough indicator of how bad the network is loaded.

With best regards,
Dmitri Abaimov, RCDD

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