3Com MSR 50, MSR 30 manual Isdn q921-permanent, Example # Apply Isdn Etsi on interface BRI 1/0, 585

585

By default, both BRI and PRI interfaces run ISDN protocol DSS1.

You are allowed to configure:

■ANSI ISDN on BRI and T1 PRI interfaces;

■AT&T ISDN on T1 PRI interfaces;

■DSS1 ISDN on BRI, E1 PRI, and T1 PRI interfaces;

■ETSI ISDN on BRI, E1 PRI, and T1 PRI interfaces;

■NI (National ISDN) on BRI interfaces;

■NI2 (National ISDN) on T1 PRI interfaces;

■QSIG ISDN on E1 PRI and T1 PRI interfaces;

■NTT ISDN on BRI and T1 PRI interfaces.

You are not allowed to configure this command on an ISDN interface if there is still a call on it. This command can take effect only if it is configured when there is no call on the interface. Alternatively, you can manually disable the interface by executing the shutdown command, configure the command, and then enable the interface by executing the undo shutdown command. The operations, however, will lead to the disconnection of the call existing on the interface.

Example # Apply ISDN ETSI on interface BRI 1/0.

<Sysname> system-view

[Sysname] interface bri 1/0

[Sysname-Bri1/0] isdn protocol-type etsi

isdn q921-permanent

Syntax isdn q921-permanent

undo isdn q921-permanent

View ISDN BRI interface view

Parameter None

Description Use the isdn q921-permanentcommand to enable the Q.921 permanent link function.

Use the undo isdn q921-permanentcommand to disable the Q.921 permanent link function.

After you enable the function, the ISDN BRI interface automatically sets up and maintains one or two Layer 2 links, whether Layer 3 calls are present on it or not. Two Layer 2 links involves when two-TEI mode is enabled on the interface.

Example # Enable the Q.921 permanent link function on interface BRI 2/0.