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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:



[edit interfaces]
ct1-pim/0/port {
partition 1-23 timeslot 1-23 interface-type bc;
}

This configuration creates interfaces bc-pim/0/port:1 throughbc-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 bc specified:



[edit interfaces]
ct1-pim/0/port {
partition 24 timeslot 24 interface-type dc;
}

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.



[edit interfaces]
ce1-pim/0/port {
partition 16 timeslot 16 interface-type dc;
}

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.

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