Netgear XM128 ISDN User Manual download pdf (Page 145)

ISDN Reference G-1

Appendix G

ISDN Reference

This appendix explains ISDN technical terms. The appendix also provides you with forms to assist

you when working with your local telephone company to set up ISDN services to use with your

Model XM128 ISDN Digital Modem.

ISDN Overview

ISDN is a global system that provides a variety of high-speed digital communication solutions,

while maintaining compatibility with existing analog voice, modem, data, and fax protocols.

ISDN is based on various standards that define communications between switches and the

equipment that connects to the switches. These standards allow most types of equipment to

communicate across different types of switches in every part of the world. Implementation of

network switches by telephone companies differs from country to country.

In North America, a separate ISDN standard called National ISDN (NI-1) is currently being

adopted by network providers and equipment manufacturers. When fully implemented, NI-1 will

make installation of ISDN equipment much easier. Currently, many different types of custom

signaling protocols are used. Therefore, you must configure your Model XM128 modem for the

type of signaling that is used by your network.

In the rest of the world, Digital Subscriber Signaling Number 1 (DSS1) is widely deployed with

minor differences from country to country. In Germany, there is an old ISDN system called 1TR6,

which will be replaced gradually by DSS1.

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Netgear XM128 ISDN User Manual Page 145