Straight through

Cross-over

Standard 'Straight Through' Ethernet 10/100Base-T Cable

Networks

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A 'straight through' cable connects a workstation or server to a hub or networking device. To connect 2 computers together for direct data transfer, you need a differently wired cable; known as a 'crossover'.

Front view of the RJ45 MALE pin.

Pin's top with Locking clip

Pinouts for a straight-through cable

Name

Pin

Wire Colour

Pin

Name

TX+

1

White/Orange

1

TX+

TX-

2

Orange

2

TX-

RX+

3

White/Green

3

RX+

4

Blue

4

5

White/Blue

5

RX-

6

Green

6

RX-

7

White/Brown

7

8

Brown

8

NOTE: Remember pin 1 and 2 are on one colour pair. 3 and 6 are on second colour pair of wire. These colours are technically approved and standardised set for straight RJ45 cat5 cable. But the colour codes of the wires become irrelevant when you connect right number pin to right wire from pin to pin. Also its not guaranteed that you will get the perfect coloured cores of cable from your supplier.

The unlabelled pins are not used for common data transfer but for some other internal signalling.

Making the Cable

RJ45 jacks are to be made with special RJ45 cable with EIGHT cores of wires, RJ45 pins and cable must be connected with a RJ45 cable.

Secure the wires in the RJ45 plugs with a Crimping Tool available at B&Q, Screwfix, Maplins, PC World, PC Warehouse, etc; for appx 12.

The first cable that you make will take about 15 minutes. With practice, it will take about 3-5 minutes