Residential Telecommunications: Jacks and Plugs

The following table contains information for readers interested in how ethernet jacks and plugs are wired.

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Standard Name	Connector	Connections								Notes
	Total Positions + Total Conductors	Position #
		Conductor Colour - Text
		Conductor Colour - Images
		Pair #
		LAN signal
Data
Notes For jacks, position numbers are assigned looking into the jack with the locking tab down and position 1 at the left. For plugs, position numbers are assigned looking at the conductor side of the plug, i.e. with the locking tab underneath, and position 1 at the left. 8-position jacks and plugs are frequently, and incorrectly, referred to as RJ45 connectors (see Wikipedia - "RJ45" naming confusion).
T568A	8P 8C	1	2	3	4	5	6	7	8	This is the primary assignment scheme specified in ANSI/TIA/EIA-568-B "Commercial Building Telecommunications Cabling Standard". ANSI/TIA/EIA-570-B "Residential Telecommunications Cabling Standards" recommends only T568A. Common in residential installations because assignments for Pair 1 and 2 are the same as the RJ (i.e. USOC) voice standards. U.S. Gov't requires T568A for wiring done under federal contract.
		White + Green	Green	White + Orange	Blue	White + Blue	Orange	White + Brown	Brown
		/ / / /		/ / / /		/ / / /		/ / / /
		Pair 3	Pair 3	Pair 2	Pair 1	Pair 1	Pair 2	Pair 4	Pair 4
		Tx+	Tx-	Rx+			Rx-			10BaseT, 100BaseT
T568B	8P 8C	1	2	3	4	5	6	7	8	This is an optional assignment scheme specified in the ANSI/TIA/EIA-568-B standard to be used "if necessary to accommodate certain 8-pin cabling systems". Previously called "AT&T 258A" or "WECO 258A". US National Communication Systems Federal Telecommunications Recommendations do not recognize T568B.
		White + Orange	Orange	White + Green	Blue	White + Blue	Green	White + Brown	Brown
		/ / / /		/ / / /		/ / / /		/ / / /
		Pair 2	Pair 2	Pair 3	Pair 1	Pair 1	Pair 3	Pair 4	Pair 4
		Tx+	Tx-	Rx+			Rx-			10BaseT, 100BaseT

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Residential Telecommunications

Jacks and Plugs - Data

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