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iSPAN PRI PCI ISDN Users Guide
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ISDN Technology
Overview
Overview
Integrated Services Digital Network (ISDN) is an
internationally agreed-upon standard for end-to-end digital
communications over the public switched network. ISDN
includes specifications for signalling, long-distance
transmission, bulk subscriber lines, and individual subscriber
lines.
Two types of ISDN service are currently available:
•
Basic Rate Interface (BRI)
•
Primary Rate Interface (PRI)
Both BRI and PRI ISDN services have two types of digital
channels: one ISDN D channel and multiple ISDN B channels.
•
The ISDN D channel is generally used to transmit
signalling and control information such as call-in-
progress, incoming-call, or call-accepted information. It
transmits information at a rate of 16 Kbps.
•
The ISDN B channels transfer data (voice, circuit-
switched data, and packet-switched data) at a rate of 56
or 64 Kbps, depending on the local ISDN network.
Basic Rate Interface
The ISDN Basic Rate Interface consists of three digital
channels: one D channel and two B channels. These channels
can be used simultaneously, and are often referred to as
2B+D
.
Summary of Contents for iSPAN 5535 PRI
Page 16: ...vi Interphase Corporation ...
Page 70: ...Removing the Drivers 50 Interphase Corporation ...
Page 82: ...Setting Up ISDN PRI Port Properties 62 Interphase Corporation ...
Page 86: ...Determining RAS Support Parameters 66 Interphase Corporation ...
Page 96: ...Problems and Possible Solutions 76 Interphase Corporation ...
Page 120: ...Routing and Remote Access Service 100 Interphase Corporation ...
Page 128: ...Setting Port and Clock Modes 108 Interphase Corporation ...
Page 134: ...Interpreting LineStatus Indicators 114 Interphase Corporation ...
Page 162: ...Glossary 142 Interphase Corporation ...
Page 167: ...iSPAN PRI PCI ISDN Users Guide 147 B channels 84 D channel 82 layer 1 alarms 85 ...
Page 168: ...148 Interphase Corporation ...