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Tech Info - LAN Pinouts

UTP by the way stands for Unshielded Twisted Pair. LAN cabling can be very confusing. With the choice of colored cable available to-day there is no real excuse for not using a simple color coding scheme to rapidly differentiate between cable types (there is NOTHING more annoying than to get the wrong cable). We have indicated our color coded standard in the various sections.

Category 3 cable will only support 10baseT networks, Categeory 5 or %e will support 10baseT and 100baseTX networks.

NOTE: You CAN use 100baseTX wiring with a 10baseT network and if you have any plans to move to 100baseTX networks you would be wise to always use 100baseTX wiring standards.

FINAL NOTE: For the wise amongst us you can get heat shrink color coded sleeves which you fit on each end of the cable beside the connector to indicate the wiring type and standard instead of using different colored cables. The advantage of this scheme is that when you change your wiring standard you can just change the sleeve color (you have to cut the ends off to re-wire the jack anyway).

Category 5 (UTP) color coding table

10base Straight Cable (PC to HUB/SWITCH)

10baseT Crossed cable (PC to PC or HUB to HUB)

100baseT Straight Cable (PC to HUB/SWITCH)

100baseT Crossed cable (PC to PC or HUB to HUB)

RJ45 Connector Pin Numbering

Category 5 (UTP) colour coding table

The following table shows the normal color coding for category 3, 5 and 5e cables (4 pair) based on the two standards supported by TIA/EIA (see also or primer on this topic)

10base Straight Cable (PC to HUB/SWITCH)

Straight cables are used to connect PCs or other equipment to a HUB or Switch. If your connection is Pc to PC or HUB to HUB you MUST use a Crossed cable.

The following cable description is for the wiring of both ends (RJ45 Male connectors) with the normal category 5 wiring colors.

Pin No. strand color Name
1 white and orange TX+
2 orange TX-
3 white and green RX+
4 NC
5 NC
6 green RX-
7 NC
8 NC

NC means not connected.

We use BLUE CABLE for 10baseT straight cables. NOTE: Almost all our wiring is now done to the 100baseT spec which you can use with 10baseT networks - but NOT the other way around.

10baseT Crossed cable (PC to PC or HUB to HUB)

Crossed cables are used to connect PCs to one other PC or to connect a HUB to a HUB. If your connection is PC to HUB you MUST use a Straight cable

The following description shows the wiring at both ends (male RJ45 connectors) of the crossed cable.

One end RJ45 Male Other end RJ45 Male
1 3
2 6
3 1
6 2

NOTE: Connections not specified are NOT CONNECTED.

We use RED CABLE for crossed cables. NOTE: All our crossed wiring is now done to the 100baseT spec which you can use with 10baseT networks - but NOT the other way around.

100baseT Straight Cable (PC to HUB/SWITCH)

Straight cables are used to connect PCs or other equipment to a HUB or Switch. If your connection is Pc to PC or HUB to HUB you MUST use a Crossed cable.

The following cable description is for the wiring of BOTH ends (RJ45 Male connectors) with your category 5 wiring colors (TIA/EIA 568A or 568B).

Pin No. strand color Name
1 white and orange TX_D1+
2 orange TX_D1-
3 white and green RX_D2+
4 blue BI_D3+
5 white and blue BI_D3-
6 green RX_D2-
7 white and brown BI_D4+
8 brown BI_D4-

 

We use BLUE CABLE for 100baseT straight cables. NOTE: Almost all our wiring is now done to the 100baseT spec which you can use with 10baseT networks - but NOT the other way around.

100baseT Crossed cable (PC to PC or HUB to HUB)

Crossed cables are used to connect PCs to one other PC or to connect a HUB to a HUB. If your connection is PC to HUB you MUST use a Straight cable.

The following description shows the wiring at both ends (male RJ45 connectors) of the crossed cable.

We use RED CABLE for crossed cables. NOTE: All our crossed wiring is now done to the 100baseTX spec which you can use with 10baseT networks - but NOT the other way around.

RJ45 Connector Pin Numbering

RJ45 Male Connector


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Last modified: July 11 2011.

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