Cisco 12000 Series Hardware Installation Manual page 12

Cisco 12000 series router sip and spa hardware installation guide

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RJ-45 Connections, Plug, and Receptacle

8 7 6 5 4 3 2 1

RJ-45 connector

Table 2-10

lists the pinouts and signals for the RJ-45 connector.

Table 2-10

RJ-45 Connector Pinout

Referring to the RJ-45 pinout in

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

Straight-Through Cable Pinout, RJ-45 Connection to a Hub or Repeater

Hub or LAN switch

Ethernet port

3 TxD+

3 RxD+

6 TxD–

6 RxD–

1 RxD+

1 TxD+

2 RxD–

2 TxD–

Table

2-10, proper common-mode line terminations should be used for

Figure 2-7

and

Figure

2-8.

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