RJ-45 Connections, Plug, and Receptacle
Table 2-10 lists the pinouts and signals for the RJ-45 connector.
Referring to the RJ-45 pinout in Table 2-10, proper common-mode line terminations should be used for
the unused Category 5 UTP cable pairs 4/5 and 7/8. Common-mode termination reduces the
contributions to electromagnetic interference (EMI) and susceptibility to common-mode sources. Wire
pairs 4/5 and 7/8 are actively terminated in the RJ-45 port circuitry in the 8-Port FastEthernet SPA.
The 8-Port FastEthernet SPA supports automatic MDI/MDIX crossover at all speeds of operation
allowing the SPA to work with straight-through and crossover Ethernet cables. Depending on your RJ-45
interface cabling requirements, use the pinouts in Figure 2-7 and Figure 2-8.
Figure 2-7 Straight-Through Cable Pinout, RJ-45 Connection to a Hub or Repeater
242688
8 7 6 5 4 3 2 1
RJ-45 connector
Table 2-10 RJ-45 Connector Pinout
Hub or LAN switch Ethernet port
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 RxD+
6 RxD–
1 TxD+
2 TxD–
H7101
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