Router Installation and Configuration Guide

(DRAFT LABEL) ALPHA DRAFT - CISCO CONFIDENTIAL
3-16
Cisco 7204 Installation and Configuration Guide
OL-5101-02
Chapter 3 Installing the Cisco 7204
Connecting I/O Controller Cables
Auxiliary Port Signals
Table 3-2 lists the signals used on the auxiliary port. The auxiliary port supports hardware flow control
and modem control.
Fast Ethernet Connection Equipment
The I/O controller is available with or without a Fast Ethernet port. The I/O controller with a Fast
Ethernet port is equipped with either a single MII port or an MII port and an RJ-45 port (only one port
can be used at a time). Although still supported by Cisco Systems, the I/O controller equipped with the
single MII port was discontinued as an orderable product in May 1998. The following sections explain
Fast Ethernet MII and RJ-45 connection equipment.
Fast Ethernet MII Connection Equipment
The MII port on the I/O controller is a 40-pin, D-shell type connector that is configurable for 100
megabits per second (Mbps) full-duplex or half-duplex (half-duplex is the default). The MII port
supports IEEE 802.3u interfaces compliant with the 100BASE-X and 100BASE-T standards. The MII
connection requires an external transceiver that permits connection to multimode fiber for 100BASE-FX
or 100BASE-T4 physical media (refer to Figure 3-14).
Table 3-2 Auxiliary Port Signals
Pin Signal Direction Description
2TxD —>Transmit Data
3RxD <— Receive Data
4RTS —> Request To Send (used for hardware flow
control)
5CTS <— Clear To Send (used for hardware flow control)
6DSR <— Data Set Ready
7 Signal
Ground
– Signal Ground
8CD <— Carrier Detect (used for modem control)
20 DTR —> Data Terminal Ready (used for modem control
only)