InCyb ISDN Page

Industrial Cyberspace (InCyb) was the first company sponsor member of the Texas ISDN Users' Group and is a charter member of that organization.

James Lee "JJ" Johnson, Internet Software Engineer, is a technical editor and contributor to Special Edition, Using ISDN, published by QUE and written by James Y. Bryce.

What is ISDN?

ISDN, Integrated Services Digital Network

• ISDN is a digital telephone service.
• ISDN has higher data speed and better data integrity than standard analog telephone service.
• ISDN dials and connects much faster than standard analog telephone service.
• B channels are used for voice or data.
• D channels are used for call control, signaling, or X.25 packet networking.
• NI-1, National ISDN 1, is the standard ISDN service being deployed in Texas and much of the U.S.

BRI, Basic Rate Service (2B+D)

• 2 B channels, 64 Kbps each
• 1 D channel, 16 Kbps
• ISDN BRI is brought to your home or business over a twisted pair of copper wires, just like a standard analog telephone service.

PRI, Primary Rate Interface (23B+D)

• 23 B channels, 64 Kbps each
• 1 D channel, 64 Kbps
• ISDN PRI is brought to your site via the same physical media as a T1 line (U.S.).

Copyright 1995, 1996, 1997, 1998, 1999 by Industrial Cyberspace, Austin, Texas.