Router Installation and Configuration Guide

(DRAFT LABEL) ALPHA DRAFT - CISCO CONFIDENTIAL

3-18

Cisco 7204 Installation and Configuration Guide

OL-5101-02

Chapter 3 Installing the Cisco 7204

Connecting I/O Controller Cables

Fast Ethernet RJ-45 Connection Equipment

The RJ-45 port on the I/O controller is configurable for 100 Mbps full-duplex or

half-duplex (half-duplex is the default) and supports IEEE 802.3, Ethernet, and IEEE 802.3u interfaces

complaint with 10BASE-T and 100BASE-TX specifications.

The RJ-45 port supports standard straight-through and crossover Category 5 UTP cables (refer to

Figure 3-14). Cisco Systems does not supply Category 5 UTP cables; these cables are available

commercially.

Figure 3-16 shows the RJ-45 connector. Table 3-4 lists the pinouts and signals for the RJ-45 port.

Figure 3-16 RJ-45 Port and Plug

Warning

To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network

voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some

LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables.

8Yes––Receive Data Valid (Rx_DV)

18 Yes ––Collision (COL)

19 Yes ––Carrier Sense (CRS)

2 –– Yes MII Data Input/Output (MDIO)

22–39 –– – Common (ground)

1, 20, 21, 40 –– – +5.0 volts (V)

1. Any pins not indicated are not used.

2. Tx_CLK and Rx_CLK are provided by the external transceiver.

Table 3-3 MII Port Pinout (continued)

In Out I/O Description

Table 3-4 RJ-45 Port Pinout

Pin Description

1 Receive Data + (RxD+)

2RxD–

3 Transmit Data + (TxD+)

6TxD–

H2936

8 7 6 5 4 3 2 1

RJ-45 connector