Preparing to Install the Router 2-15
Serial Connections
Signaling Standards Supported
The synchronous serial ports available for the router support the following signaling
standards: EIA/TIA-232, EIA/TIA-449, V.35, X.21, and EIA-530. You can order a Cisco
DB-60 shielded serial transition cable that has the appropriate connector for the standard
you specify. The documentation for the device you want to connect should indicate the
standard used for that device. The router end of the shielded serial transition cable has a
DB-60 connector, which connects to the DB-60 port on a serial WAN interface card. The
other end of the serial transition cable is available with a connector appropriate for the
standard you specify.
The synchronous serial port can be configured as DTE or DCE depending on the attached
cable (except EIA-530, which is DTE only). To order a shielded cable, contact customer
service.
Note All serial ports configured as DTE require external clocking from a CSU/DSU or
other DCE device.
Table 2-1 Typical DTE and DCE Devices
Device type Gender Typical Devices
DTE Male
1
1 If pins protrude from the base of the connector, the
connector is male.
Terminal
PC
DCE Female
2
2 If the connector has holes to accept pins, the connector is
female.
Modem
CSU/DSU
Multiplexer
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