Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

Configuring Primary Rate Interfaces

 

Primary rate interfaces are a combination of B-channels with one controlling D-channel for the group. Configure B-channel interfaces for each time slot that you want to function as an ISDN PRI interface. The B-channel is used for data, video, voice, and multimedia. You can create:

  • 23 B-channels on a channelized T1 interface

  • 30 B-channels on a channelized E1 interface

To configure B-channels on a channelized T1 interface, include the partition statement at the [edit interfaces ct1-pim/0/port] hierarchy level with the timeslots statement and interface-type bc specified:

This configuration creates interfaces bc-pim/0/port:1 through bc-pim/0/port:1, and ds-pim/0/port:3.

Use the same configuration to create B-channels on a channelized E1 interface by including the partition statement and options at the [edit interfaces ce1-pim/0/port] hierarchy level.

One D-channel is used between switching equipment in the ISDN network and the ISDN equipment at your site for signaling. For channelized E1, the D-channel must be time slot 16. For channelized T1, the D-channel must be time slot 24.

To configure a D-channel on a channelized T1 interface, include the partition statement at the [edit interfaces ct1-pim/0/port] hierarchy level with the timeslots statement and interface-type dc specified:

This configuration creates interfaces dc-pim/0/port.

Use the same configuration to create B-channels on a channelized E1 interface by including the partition statement and options at the [edit interfaces ce1-pim/0/port] hierarchy level.

To view PRI or ISDN options information about interface, use the following operational mode commands supporting BRI interfaces:

  • show interfaces interface-name detail

  • show interface dln

  • show isdn calls

  • show isdn history

  • show isdn q921 statistics

  • show isdn q931 statistics

  • show isdn status

Note

You must configure a D-channel and B-channels to complete your ISDN PRI line configuration.

Note

You can configure dso-options on the B-channel, but you cannot configure parameters for a D-channel. However, when interface statistics are displayed, both B-channel and D-channel interfaces have statistical values.