3Com 10014299 Enter view of specified synchronous interface, Physical-mode sync, Lapb ppp sdlc

124CHAPTER 10: CONFIGURING WAN INTERFACE

■Enable or disable level detection

■Enable or disable data carrier detection

■Setting the synchronous serial interface to work in full duplex or half duplex mode

■Enable or disable internal loopback/external loopback

■Set MTU

■Set the time interval for sending keepalive packets

■Set the idle coding of synchronous serial interface

PPP/X.25/FR parameters, BDR parameters, IP address, firewall parameters and standby center parameters should be configured on the synchronous serial interface if needed. Refer to the relevant chapters in this manual for details.

1Set the synchronous/asynchronous serial interface to work in synchronous mode.

Before further configuration, please set the synchronous/asynchronous serial interface to work in synchronous mode with the following command in the view of synchronous/asynchronous serial interface.

Table 109 Set the synchronous/asynchronous serial interface to work in synchronous mode

Operation	Command
Set the synchronous/asynchronous serial interface in	physical-mode sync
synchronous mode.

The synchronous/asynchronous serial interface works in synchronous mode by default.

2Enter the view of the specified synchronous serial interface

In all views, enter the view of the specified synchronous serial interface with the following command.

Table 110 Enter view of specified synchronous interface

Operation	Command
Enter the view of the specified synchronous/asynchronous	interface serial number
serial interface (which has been set to work in synchronous
mode)

3Set link layer protocol

The link layer protocol of synchronous serial interface can be set to PPP, LAPB, X.25, Frame Relay, HDLC or SDLC.

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

Table 111 Set the link layer protocol of synchronous serial interface

Operation	Command
Set link layer protocol	link-protocol { fr hdlc
	lapb ppp sdlc x25 }

Select PPP link layer protocol by default.

4Set the digital signal encoding format

The synchronous serial interface support two digital signal encoding formats: NRZ (nonreturn to zero) and NRZI (nonreturn to zero, inverted).