3Com 10014299 Set the work mode of asynchronous serial interface, Modem in out, Baudrate baudrate

Asynchronous Serial Interface 119

instructions in dialup mode. In dedicated line mode, ensure that modem command is not configured, i.e. disable dial with undo modem command.

Please use the following commands in the view of asynchronous serial interface.

Table 96 Set the work mode of asynchronous serial interface

Operation	Command
Set the asynchronous serial interface to work in dial mode.	modem { in out }
Set the asynchronous serial interface to work in dedicated	undo modem
line mode.

The asynchronous serial interface works in dial mode by default, i.e. modem command is configured by default. Both calling in and calling out are allowed with modem in and modem out command. The async/sync serial interface working in asynchronous mode works in dedicated line mode by default.

4Set link layer protocol

The link layer protocol of asynchronous serial interface can be set as SLIP and PPP.

Please use the following command in the view of the asynchronous serial interface.

Table 97 Set the link layer protocol of asynchronous serial interface

Operation	Command
Set the link layer protocol of the asynchronous serial	link-protocol { slip ppp }
interface

The default link layer protocol is PPP.

5Set baud rate

Please use following command in the view of the asynchronous serial interface.

Table 98 Set the baud rate of asynchronous serial interface

Operation	Command
Set baud rate of the asynchronous serial interface	baudrate baudrate

Default value for baud rate is 9600bps.

When the asynchronous serial interface is used in dialup mode, the baud rate only refers to the communication rate between the asynchronous serial interface of the router and Modem. And the rate between two Modems must be determined according to the line quality after mutual consultation. Therefore, baud rate settings of asynchronous serial interfaces of two routers at two ends of the line can be inconsistent.

When the asynchronous serial interface is used in dedicated line mode, the baud rate setting must be consistent with the opposite equipment.

After the synchronous/asynchronous serial interface is set to work in asynchronous mode, the router will automatically change the baud rate to 9600bps.

6Set link establishment mode

There are three link establishment modes for the asynchronous serial interface:

■Protocol: After the setup of a physical connection, the local end directly uses the set link layer protocol parameter to establish link with the opposite end.