The Dual-Port Channelized T1/E1/ISDN PRI PIM provides support for ISDN PRI services such as dial-in at the central office, callback from the central office, and primary or backup network connections from branch offices. For more information about the services, see Configuring ISDN.
You can configure up to 23 time slots in a channelized T1 PRI interface and up to 30 time slots in a channelized E1 PRI interface as B-channels. The 24th time slot in a T1 interface and the 16th time slot in an E1 interface are configured as the D-channel interface for signaling purposes. Each B-channel supports 64 Kbps of traffic. The unconfigured time slots can be used as regular DS0 interfaces on top of the T1 or E1 physical layer.
You can install channelized T1/EI/ISDN PRI PIMs and ISDN BRI PIMs and configure both ISDN PRI and ISDN BRI service on the same Services Router.