Installing the Router
Cisco 805 Router Hardware Installation Guide
2-10
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.
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 2-4 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.
Table 2-2
Connecting a Serial Device
Serial Device
WAN Options
WAN Encapsulation
(Framing)
Network Type
Asynchronous modem
Asynchronous dial-up
line
Point-to-Point Protocol
(PPP)
• Remote office to corporate office
• Small office to Internet service
provider (ISP)
Channel service
unit/data service unit
(CSU/DSU)
• Synchronous leased
line
• 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
