Channelized T1/E1/ISDN PRI Interfaces Overview

Channelization enables routers to provide IP services to users with different access speeds and bandwidth requirements. Users share an interface that has been divided into discrete time slots, by transmitting in only their own time slot. On J-series Services Routers, a single channelized T1/E1/ISDN PRI interface can be partitioned into the following numbers of DS0 or ISDN PRI time slots, by means of software configuration:

• T1 interface—Up to 24 DS0 time slots (channels 1 through 24).
• E1 interface—Up to 31 DS0 time slots (channels 1 through 31).
• ISDN PRI—Up to 23 ISDN PRI B-channels and 1 D-channel when the parent interface is channelized T1, and up to 30 ISDN PRI B-channels and 1 D channel when the parent interface is channelized E1. Time slots on the interface unused by ISDN PRI can operate normally as DS0 interfaces.

  For more information about ISDN, see ISDN Interface Overview.

Note: You cannot configure the channelized T1/E1/ISDN PRI PIM through a J-Web Quick Configuration page.

You can aggregate the channels on a channelized interface into bundles called channel groups to aggregate customer traffic.

A single channelized T1/E1/ISDN PRI interface also supports drop-and-insert multiplexing, to integrate voice and data channels on a single T1 or E1 link. The drop-and-insert feature allows you to remove the DS0 time slots of one T1 or E1 port and replace them by inserting the time slots of another T1 or E1 interface.