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. |
