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Voice Feature Guide 01

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Introduction to ISDN

Introduction to ISDN


The integrated services digital network (ISDN) is a CCITT standard, providing integrated transmission service for voice, video, and data. The ISDN enables the voice, video, and data to be transmitted on the data channel simultaneously.

The ISDN supports two types of services:
  • Basic rate interface (BRI): provides a rate of 144 kbit/s, including two B channels and one D channel. The rates of B and D channels are 64 kbit/s and 16 kbit/s, respectively.
  • Primary rate interface (PRI): provides a rate of 2.048 Mbit/s, including 30 B channels and 1 D channel. The rates of both B and D channels are 64 kbit/s.
ISDN networks support B and D channels, shown in Figure 1-104.
  • B channels are used for carrying services.
  • D channels are used for transmitting call control signaling as well as maintenance and management signaling.
Figure 1-104 ISDN channels


The ISDN access on the media gateway provides integrated transmission services, such as voice, video, and data for the users.

Updated: 2019-02-22

Document ID: EDOC1100067358

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