SAGEM 3P@C

1.1.1.49Preparing the network cables

A Category 5 twisted pair is made up of 8-core thin wires. They are identified into groups by the color of the external insulation layer of the thin wires. In general, a single color and a single color plus white are used to identify a twisted pair, or color dots are sometimes used for paired identification. According to this method of identification, the eight-core thin wires of a Category 5 twisted pair can be divided into four pairs: Orange & orange/white, blue & blue/white, green & green/white, brown & brown/white.

Usually there are two kinds of Ethernet cables connecting the two Ethernet devices: Straight-through cable and crossover cable. Figures 4-39 and 4-40 show respectively the connection methods of a straight-through cable and a crossover cable. Selection shall be based on the application requirements. In the figures, "SIDE1" and "SIDE2" indicate the two ends of the network cable respectively while numbers "1 ~ -8" represents the line sequence at the two ends.

Figure 4-39 Illustration of making a straight-through cable

Pinouts of a straight-through cable

Illustration

 

 

 

 

Orange/white

Orange/white

 

Orange

Orange

 

Green/white

Green/white

 

Blue

Blue

 

Blue/white

Blue/white

 

Green

Green

 

Brown/white

Brown/white

 

Brown

Brown

Figure 4-40 Illustration of making a crossover cable

 

 

Pinouts of a crossover cable

Illustration

 

 

Orange/white

Green/white

 

Orange

Green

 

Green/white

Orange/white

 

Blue

Blue

 

Blue/white

Blue/white

 

Green

Orange

 

Brown/white

Brown/white

 

Brown

Brown

1.1.1.50Ethernet interface connection

Connect one end of the twisted pair that uses RJ-45 connectors at both ends to the Ethernet interface of the SMUB, and the other end to the Ethernet interface of the other Ethernet-compatible device in the LAN, as shown in Figure 4-41:

3P@C Installation Manual

Page 4-29

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