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Chapter 9: Planning for and Installing ISDN The Movement Towards Unity Despite this widening interconnectivity, however, there still remain slight but often critical differences between ISDN services from various sources. ISDN service from NYNEX, for example, may be slightly different from that offered by another regional telephone company, and both in turn may be different from services supported by the nationwide IECs. The problem, of course, has been recognized, and is being addressed by a growing and rapidly accelerating trend to standardize ISDN services throughout the nation, and the world. National ISDN In 1992, NYNEX and the other major regional telephone operating companies, as well as major telephone switch manufacturers, made a commitment to move towards a uniform, nationwide ISDN service. This thrust, as detailed by Bell Communications Research (Bellcore), is called National ISDN. It specifies that every central office ISDN switch throughout the nation should operate in a standard way, and offer a standard interface to the telephones, terminals and other Customer Premises Equipment - CPE in telephone jargon - from many different manufacturers. National ISDN is being deployed in phases, each building on the one before. National ISDN-1 (or NI-1), for example, calls for a uniform Basic Rate Interface, the implementation of basic switch features, and the availability of a Primary Rate Interface. NI-2 adds a uniform Primary Rate Interface, consistent end-user services, and the availability of the even higher-speed dialed capabilities of Switched Fractional DS-1. NI-3 holds the promise of full compatibility and equipment interoperability between all ISDN switches, and adds additional end-user features. Ordering Codes A corresponding thrust is also bringing order to the world of customer equipment. All major telephone carriers, as well as telephone switch and customer equipment manufacturers, are now implementing "central office switch translations" - called ISDN Ordering Codes. These describe the capabilities and needs of customer premise equipment, and tell a telephone company how an ISDN line should be configured, or "provisioned," for that equipment. Today, hundreds of ISDN products have successfully completed this translation and coding procedure, with hundreds more - from virtually every major equipment manufacturer - in the process. "National ISDN and Ordering Codes mean that ultimately customers will be able to buy equipment, plug it in anywhere in the nation, and have it work right out of the box." says Ralph Nultemeier of Digital Equipment Corporation, which offers full ISDN equipment, installation and support services in New York City. "Like any new technology, ISDN still has its problems and growing pains," he said, "but things are getting better fast." Other Sections Of This Chapter: Beginning Of Chapter 9 The Movement Towards Unity NYNEX ISDN Services ISDN Basic Service ISDN Intellipath ISDN Primary Service ISDN Equipment Wiring For ISDN Getting Started Now ISDN Home Page | Table of Contents