Cisco Systems 805 manual Serial Connection Example

Serial Connection Example

Serial Connection Example

Figure A-1 shows a typical serial connection for the Cisco 805 router. In this example, the router, which is a DTE device, is connected to a CSU/DSU or modem, which are DCE devices.

Figure A-1 Serial Connection Example

Cisco 805			CSU/DSU
router			or modem
	V.35 DTE cable		DCE device
DTE
device		(provides clocking)

18958

The CSU/DSU or modem and its serial connector have the following characteristics:

•

•

•

DCE device

V.35

Female

Because the serial devices are DCE, you should use a DTE cable to connect the router and the CSU/DSU or modem. (For more information on the cable type needed to connect a serial device, refer to Table A-2.)

Given these characteristics, the appropriate serial cable to connect the router and the CSU/DSU or modem is a DTE V.35 male cable.

Note Some CSU/DSUs have a proprietary serial connector that will not mate with a Cisco serial cable. If this situation occurs, you must provide an adapter (pigtail) cable that makes the proprietary serial connector compatible with the Cisco serial connector. The gender of the adapter cable should match the gender of the proprietary serial connector.

Selecting a Serial Cable A-5