H3c-technologies H3C SecPath F5000-A5 Firewall User Manual download pdf (Page 110)

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strict application requirements and are expensive although they provide better EMI prevention

performance than UTPs, so in most LANs, UTPs are commonly used.

An Ethernet twisted pair cable connects network devices through the RJ-45 connectors at the two

ends. Figure 74 sh

ows the pinouts of an RJ-45 connector.

Figure 74 RJ-45 connector pinout diagram

NOTE:

The RJ-45 Ethernet interfaces use category 5 or higher Ethernet twisted pair cables for connection.

EIA/TIA cabling specifications define two standards, 568A and 568B, for cable pinouts.

• Standard 568A—pin 1: white/green stripe, pin 2: green solid, pin 3: white/orange stripe, pin 4:

blue solid, pin 5: white/blue stripe, pin 6: orange solid, pin 7: white/brown stripe, pin 8: brown

solid.

• Standard 568B—pin 1: white/orange stripe, pin 2: orange solid, pin 3: white/green stripe, pin 4:

blue solid, pin 5: white/blue stripe, pin 6: green solid, pin 7: white/brown stripe, pin 8: brown

solid.

Ethernet twisted pair cables can be classified into straight-through and crossover cables based on their

pinouts:

• Straight-through—The pinouts at both ends comply with standard 568B, as shown in Figure 75.

• C

rossover—The pinouts at one end comply with standard 568B, and those at the other end comply

with standard 568A, as shown in Figure 76.

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H3c-technologies H3C SecPath F5000-A5 Firewall User Manual Page 110