R2511-HP MSR Router Series Interface Configuration Guide(V5)

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[Router] user-interface tty 16
[Router-ui-tty16] modem both
[Router-ui-tty16] quit
[Router] user-interface tty 32
[Router-ui-tty32] modem both
[Router-ui-tty32] quit
Configuring a synchronous serial interface
A synchronous serial interface has the following features:
• Operates in either DTE or DCE mode. Usually, it serves as DTE to accept the clock provided by DCE.
• Connected by various types of cables, such as V.24, V.35, X.21, RS449, and RS530. Your device
can automatically detect the type of connected cables and select electrical properties. In most cases,
you do not need to configure them manually.
• Supports link layer protocols such as PPP, FR, link access procedure, balanced (LAPB), and X.25.
• Supports network layer protocols IP and IPX.
• Provides information about the connected cable type, operating mode (DTE or DCE), and so on
after you run the display interface serial command.
To set the baud rate for a synchronous/asynchronous serial interface operating in asynchronous mode,
use the speed command in user-interface view. For more information, see Fundamentals Configuration
Guide.
Configure PPP/X.25/FR, DCC, IP address, firewall, and backup center for the synchronous serial
interface if the network requires.
To configure a synchronous serial interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter synchronous serial
interface view.
interface serial interface-number N/A
3. Configure a synchronous or
asynchronous serial interface
to operate as a synchronous
serial interface.
physical-mode sync
Optional.
A synchronous or asynchronous
serial interface operates as a
synchronous serial interface.
This command is not available on
AM interfaces.
Skip this step if the interface is an
Async interface.
4. Set the interface description.
description text
Optional.
By default, the description of a
synchronous serial interface is
interface name Interface, for
example, Serial2/0 Interface.
5. Set the link layer protocol.
link-protocol { fr | hdlc | lapb |
ppp | sdlc | x25 }
Optional.
The default is PPP.