Cisco Systems 805 manual Connecting a Serial Device, Ppp

Installing the Router

Connecting a Serial Device

You can connect any one of several serial devices to the router serial port. For more information, see the “DTE or DCE” section in Appendix A, “Selecting a Serial Cable.”

Table 2-2 describes the devices most commonly connected to the router serial port and how these devices are used.

Table 2-2	Connecting a Serial Device
		WAN Encapsulation
Serial Device	WAN Options	(Framing)	Network Type
Asynchronous modem Asynchronous dial-up		Point-to-Point Protocol	• Remote office to corporate office
	line	(PPP)	• Small office to Internet service

provider (ISP)

Channel service	•	Synchronous leased
unit/data service unit		line
(CSU/DSU)	•	Frame Relay
	•	X.25

•For synchronous leased line: High-Level Data Link Control (HDLC) or

PPP

•Frame Relay

•X.25

•Remote office to corporate office

•Small office to ISP

Note A serial cable does not ship with the router. For information on selecting and ordering the serial cable, refer to Appendix A, “Selecting a Serial Cable.”

Follow the steps in Figure 2-5 to connect a modem or CSU/DSU.

Caution The Cisco 805 router does not support the Australian IUT requirement, which specifies that the router must communicate for 1/2 hour after a power failure. If a power failure occurs, the Cisco 805 router stops communicating with other devices.

2-10Cisco 805 Router Hardware Installation Guide