T568A and T568B

Q: Which of the eia wiring configurations--T568A or T568B--is the crossed one? I have two patch panels--one of each--and I want to purchase another one identical to one of them, but I am having trouble determining which to order.

Aug. 1, 1998

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Linda Taylor

Real Data Systems Inc.

Burnaby, BC, Canada

A: Both T568A and T568B are shown in TIA/EIA-568a, Section 10.4.5, Telecommunications Outlet/Connector. Neither is crossed. Electrically, it does not matter which you choose, but once you have made a choice, stay with the same configuration throughout the site or else you will eternally be trying to determine: Is this the one where I have to swap the orange and green pairs or where I terminate them straight?

Donna Ballast is a communications analyst at the University of Texas at Austin and a bicsi reg-istered communications distribution designer (RCDD). Questions can be sent to her at:

Cabling Installation & Maintenance, or at

PO Drawer 7580,

The University of Texas,

Austin, TX 78713;

tel: (512) 471-0112, fax: (512) 471-8883,

e-mail: [email protected].