Cables, Connectors, And Pinouts - Cisco 7600 SIP 200 - SPA Interface Processor 200 Hardware Installation Manual

4-Port and 8-Port Fast Ethernet SPA Overview

Cables, Connectors, and Pinouts

The interface connectors on the 4-Port and 8-Port Fast Ethernet SPA are four or eight individual RJ-45
receptacles. You can use all interface connectors simultaneously. Each connection supports IEEE 802.3
and Ethernet 10/100BASE-T interfaces compliant with appropriate standards. Cisco Systems does not
supply Category 5 unshielded twisted-pair (UTP) RJ-45 cables; these cables are available commercially.
Figure 3-42
Figure 3-42
Table 3-24
Pin
1
2
3
6
Referring to the RJ-45 pinout in
Note
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 4-Port and 8-Port Fast Ethernet
SPA.
The 4-Port and 8-Port Fast Ethernet 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 3-43
Hub or LAN switch
Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
3-50
shows the RJ-45 connector.
RJ-45 Connections, Plug, and Receptacle
8 7 6 5 4 3 2 1
RJ-45 connector
RJ-45 Connector Pinout
Description
Transmit data + (TxD+)
TxD–
Receive data + (RxD+)
RxD–
Straight-Through Cable Pinout, RJ-45 Connection to a Hub or Repeater
Ethernet port
3 TxD+ 3 RxD+
6 TxD– 6 RxD–
1 RxD+ 1 TxD+
2 RxD– 2 TxD–
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
Table 3-24 lists the pinouts and signals for the RJ-45 connector.
Table 3-24, proper common-mode line terminations should be used for
Figure 3-43 and Figure 3-44.
OL-5052-14