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CCIE Fundamentals: Network Design and Case Studies, Second Edition by Cisco Systems, Inc.

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Chapter 11. Designing ISDN Networks

Edited by Salman Asad

The Public Switched Telephone Network (PSTN) has been transformed into an Integrated Systems Digital Network (ISDN). Implementation of Signaling System 7 (SS7) in the PSTN backbone has made possible such widespread services as caller ID and dialed-number delivery, 800-Directory number lookup, calling-card services, and digital data services. Using BRI and PRI services, ISDN call switching can be extended to customer premises equipment (CPE), and can provide end-to-end digital paths.

Prior to ISDN availability, data connectivity over the Public Switched Telephone Network (PSTN) was via Plain Old Telephone Service (POTS) using analog modems. Connectivity over ISDN offers the networking designer ...

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