Colourscheme on RJ-45 walloutlet. FREE cabling and networking Helpdesk
 Question by Peter Lundqvist posted 03 Feb 2005
 Colourscheme on RJ-45 walloutlet.

Please help me by showing for example a diagram on an outlet, what colour on what pin.
I'm puzzled of why cat-5 straightthrough sometimes begin with whi/ora, sometimes w. brown.

Thank's in advance, Peter
 Answer by Joseph Golan posted 13 Feb 2005
Dear Peter,
Look at on this site (at the top) REsources|references|Pin Layouts for the vatriation of connection types for an 8 pin modular jack (commonly incorrectly referred to as an RJ-45. This is also known as T-568-A or T-568-B wiring schemes. The origin is back to the Telco RJ (Registered Jack) standards which has line 1 (typically the Wh/Bl pair) on the center pins. From here pair 2 (Wh/Or was on the next two centered pins which now left the right two pins as a pair and the left two pins as a pair fro pairas 3 (Wh/Gn) & 4 (Wh/Bn). The difference between the T568A & T568B schemes was the reversing of the WH/Or and WH/Gn pair positions. Last, depending which way you look at an 8 pin modular plug will be the Wh/Bn or the Wh/Or pairs.

Joseph Golan, RCDD

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