Specifications

System Specifications 3-27

External Connections

This section contains the external connection requirements for the Cisco 7204 and Cisco 7206

routers.

• Input/Output Controller (I/O controller)

— The I/O controller has two EIA/TIA-232 ports: a DCE-mode console port and a DTE-mode

auxiliary port. The console port is a DCE DB-25 receptacle for connecting a data terminal,

which you will use to conﬁgure the interfaces and bring up the router.

— The auxiliary port is a DTE DB-25 plug for connecting a modem or other DCE device (such

as a CSU/DSU or other router) to the router. A standard EIA/TIA-232 cable can be used for

the auxiliary and console ports.

— The MII connector supports IEEE 802.3u interfaces compliant with the 100BaseX and

100BaseT standards. The single MII connection requires an external transceiver that permits

connection to multimode ﬁber for 100BASE-FX or 100BaseT4 physical media.

• Port adapters

The Cisco 7204 and the Cisco 7206 routers use port adapters that provide the following electrical

interfaces:

— Synchronous serial using EIA/TIA-232, EIA/TIA-449, V.35, and X.21 DTE and DCE

cables, and EIA-530 DTE cables only

— IEEE 802.5 Token Ring using RJ-45 connections

— IEEE 802.3 Ethernet 10BaseT using RJ-45 connections

— IEEE 802.3 Ethernet 10BaseFL using ST-type multimode, optical ﬁber connections

— IEEE 802.3u Fast Ethernet 100BaseTX and 100BaseFX using MII and RJ-45 or MII and

SC-type optical ﬁber connections

— Single-mode and multimode FDDI using MIC and SC-type optical ﬁber connections