ISDN Interfaces Overview

ISDN is a set of standards for digital transmission over different media created by the Consultative Committee for International Telegraphy and Telephony (CCITT) and the International Telecommunication Union (ITU). ISDN is a dial-on-demand service that provides fast call setup, low latency, and the ability to carry high-quality voice, data, and video transmissions. ISDN is also a circuit-switched service that can be used on both multipoint and point-to-point connections.

You configure two types of interfaces for ISDN service: a physical interface and a logical interface called the dialer interface.

Four types of Physical Interface Modules (PIMs) provide ISDN connectivity on J-series Services Routers:

• 1-port S/T interface supporting ITU-T I.430, ETSI TS 101080, and GR-1089-Core Type III
• 1-port U interface supporting ANSI T.601 and GR-1089-Core
• 4-port S/T interface supporting ITU-T I.430, ETSI TS 101080, and GR-1089-Core Type III as a field-replaceable unit (FRU)
• 4-port U interface supporting ANSI T.601 and GR-1089-Core

For information about installing hardware, see the J-series Services Router Getting Started Guide.

For information about installing ISDN service over an ISDN line, contact your telecommunications service provider.

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