Auxiliary Port Signals; Fast Ethernet Connection Equipment; Fast Ethernet Mii Connection Equipment - Cisco Router 7204 Installation And Configuration Manual

Connecting I/O Controller Cables
( D R A F T L A B E L ) A L P H A D R A F T - C I S C O C O N F I D E N T I A L

Auxiliary Port Signals

Table 3-2
and modem control.
Table 3-2
Pin
2
3
4
5
6
7
8
20

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
Cisco 7204 Installation and Configuration Guide
3-16
lists the signals used on the auxiliary port. The auxiliary port supports hardware flow control
Auxiliary Port Signals
Signal Direction
TxD —>
RxD <—
RTS —>
CTS <—
DSR <—
Signal –
Ground
CD <—
DTR —>
Description
Transmit Data
Receive Data
Request To Send (used for hardware flow
control)
Clear To Send (used for hardware flow control)
Data Set Ready
Signal Ground
Carrier Detect (used for modem control)
Data Terminal Ready (used for modem control
only)
Figure 3-14).
Chapter 3 Installing the Cisco 7204
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