3com 3031 インストール手順

The other configurations of the AUX interface (e.g., rate, stop bit, parity and flow 
control) should be performed in user-interface view. See the User Interface 
Configuration section in System Management Module of this manual.

This section describes how to configure a synchronous serial interface.

A synchronous serial interface has the following features:

■

It can work in either DTE or DCE mode. Usually, it serves as a DTE device and 
accepts the clock provided by the DCE device.

■

It can be connected to various cables, such as V.24 , V.35, X.21 etc. As the 
software can automatically detect the type of external cables connected to the 
synchronous serial interface and complete the selection of electric features, you 
do not need to make the manual configuration in most cases.

■

It supports the link layer protocols PPP, FR, LAPB, X.25 etc. 

■

It supports the network layer protocols IP and IPX.

■

It allows you to view information like the current external cable type and the 
operating mode (DTE/DCE) by executing the 

command.

Perform the following tasks to configure a synchronous serial interface:

■

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

■

Enter the specified synchronous serial interface view

■

Set link layer protocol

■

Set digital signal coding format

■

Set baud rate

■

Select operating clock

■

Set clock inversion

■

Configure MTU

■

Enable/Disable level detection

■

Enable/Disable data carrier detection

■

Set the full/duplex mode of synchronous serial interface

■

Enable/Disable loopback

■

Configure the interval for sending keepalive packets

■

Configure line idle-mark of synchronous serial interface

Depending on the requirements, you probably also need to configure the 
synchronous serial interface with the parameters in PPP/X.25/FR, DCC, IP address, 
firewall, backup center, and so on. For details, refer to the relevant sections in this 
manual.