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Channelized E1 PRI and T1 PRI Overview

J Series Services Routers equipped with a Dual-Port Channelized T1/E1 PIM support Integrated Services Digital Network (ISDN) Primary Rate Interfaces (PRIs). ISDN PRI, referred to as S2M in Europe, is the “primary” extended ISDN network interface. It offers a larger capacity of digital channels utilizing a variety of improved mediums, and is used by large organizations with intensive communication needs. In contrast, the ISDN Basic Rate Interface (BRI), known as SO in Europe, provides a limited number of channels, transmitting over copper wire, and is used by smaller organizations or individuals with less intensive communication needs. For more information about configuring ISDN BRI interfaces, see Configuring ISDN Physical Interface Properties.

Unlike channelized PICs on the M Series and T Series routers, the interface type on the Dual-Port Channelized T1/E1 PIM is configurable. A single interface can operate as either a channelized T1 or channelized E1 interface (or clear channel) or as an ISDN PRI. The ISDN PRI channels can operate on the same interface as T1 or E1 channels. The PIM also supports a “drop-and-insert” feature, allowing you to insert channels from one port on the PIM into the other port on the PIM.

• ISDN BRI is configured by specifying properties for a physical (br-) interface and a logical (dln) interface.
• For ISDN PRI, you configure:
  1. Either a channelized E1 (ce1-pim/0/port) or channelized T1 (ct1-pim/0/port) interface.
  2. Time slots within a ce1-pim/0/port interface or ct1-pim/0/port interface.
  3. A bearer (B) channel bc-pim/0/port:channel interface for each time slot that you want to function as an ISDN PRI B-channel. The B-channel is used for data, video, voice, and multimedia. You can create up to 30 B-channels on a channelized E1 interface, and 23 B-channels on a channelized T1 interface.
  4. One delta (D) channel, 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.

Note: Time slots can also be shared with ds-pim/0/port time slots within the same channelized interface.

Channelized E1 and T1 PIMs on J Series routers provide support for ISDN PRI connectivity for dial-in and callback, and for use as primary or backup network connections.