Cisco XR 12000, Hardware Installation Manual

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Cisco XR 12000 Series Router SIP and SPA Hardware Installation Guide
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Chapter 2 Overview: Cisco XR 12000 Series Router Shared Port Adapters
8 Port FastEthernet SPA Overview
Figure 2-6 RJ-45 Connections, Plug, and Receptacle
Table 2-10 lists the pinouts and signals for the RJ-45 connector.
Note 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
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8 7 6 5 4 3 2 1
RJ-45 connector
Table 2-10 RJ-45 Connector Pinout
Pin Description
1 Transmit data + (TxD+)
2 TxD–
3 Receive data + (RxD+)
4 Reserved
5 Reserved
6 RxD–
7 Reserved
8 Reserved
Hub or LAN switch Ethernet port
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 RxD+
6 RxD–
1 TxD+
2 TxD–
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