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CHAPTER 6: Cables and Connectors
6. Cables and Connectors
6.1 100BASE-TX Ethernet Cable and Connectors
• Cable characteristics: 0.4 to 0.6 mm (22 to 26 AWG) 4-pair (only two
pairs/four wires are used for 100BASE-TX); Category 5 unshielded twisted-pair
or EIA/TIA-568 compliant, 100-ohm shielded twisted-pair
• Maximum segment length: 100 meters (328 ft.)
• Maximum network diameter: 205 meters (673 ft.)
• Connectors: RJ-45
Figure 6-1. RJ-45 connectors.
Table 6-1. Straight twisted-pair cable pinouts.
Contact
MDI-X Signal
MDI Signal
1
RD+ (receive)
TD+ (transmit)
2
RD- (receive)
TD- (transmit)
3
TD+ (transmit)
RD+ (receive)
4
Not used
Not used
5
Not used
Not used
6
TD- (transmit)
RD- (receive)
7
Not used
Not used
8
Not used
Not used
