Auxiliary Port Signals; Fast Ethernet Mii Connection Equipment - Cisco 7204 Installing

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

Fast Ethernet MII Connection Equipment

The optional Fast Ethernet port on the I/O controller has a single MII, 40-pin, D-shell type
connector that is configurable for 100 megabits per second (Mbps). The MII connector
supports IEEE 802.3u interfaces compliant with the 100BASE-X and 100BASE-T
standards. The single MII connection requires an external transceiver that permits
connection to multimode fiber for 100BASE-FX or 100BASE-T4 physical media (refer to
Figure 3-7).
Caution
completely powered down before connecting an external transceiver to the Fast Ethernet
port on the I/O controller. If you connect an external transceiver to the Fast Ethernet port
when the router is powered on, the system will reset and you could lose data.
3-14 Cisco 7204 Installation and Configuration Guide
Auxiliary Port Signals
Signal Direction
TxD —>
RxD <—
RTS —>
CTS <—
DSR <—
Signal Ground –
CD <—
DTR —>
Make sure input power to your Cisco 7204 is turned off and the router is
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)