Victor Yager Accountant & Information Technology Professional

EIA/TIA 568 Standard

"Electronics Industries Alliance / Telecomunications Industry Association"



In 1991 EIA/TIA released their joint 568 Commercial Building Wiring Standard, AKA structured cabling, for uniform, enterprise-wide, multivendor cabling systems. The standard suggests how cabling may best be installed to maximize performance and minimize upkeep. It's based on a heirarchical design that divides cabling into six subsystems: entrance facility, backbone (vertical) wiring, equipment room, telecommunications closet, horizontal wiring, and work area.



Twisted-pair as defined by the EIA/TIA-568

Horizontal and backbone cable Shielding Maximum transmission rate
IBM type 1A Shielded 4 Mbps
IBM type 2A Shielded 4 Mbps
Category 3 Unshielded 16 Mbps
Category 4 Unshielded 20 Mbps
Category 5 Unshielded 100 Mbps


RJ-45 pin-out for Cat 5 EIA/TIA-568-A

PinTip/Ring ColorPair
1White/GreenPair 3
2Green/WhitePair 3
3White/OrangePair 2
4Blue/WhitePair 1
5White/BluePair 1
6Orange/WhitePair 2
7White/BrownPair 4
8Brown/WhitePair 4

RJ-45 pin-out for Cat 5 EIA/TIA-568-B

PinTip/Ring ColorPair
1White/OrangePair 2
2Orange/WhitePair 2
3White/GreenPair 3
4Blue/WhitePair 1
5White/BluePair 1
6Green/WhitePair 3
7White/BrownPair 4
8Brown/WhitePair 4

Please e-mail me your comments / suggestions!
Click here to e-mail Vic



About Me | Cisco Systems | DOS to UNIX | EIA/TIA 568 Standard | Hardware Resources | IEEE 802.3 Standard | Index Page | Linux | Novell | OSI Model | Services | Software Resourses | UNIX | vi Editor Commands | Windows NT/2000/XP


Copyright © Victor Yager. All rights reserved.