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Introduction

The purpose of ISDN(Integrated Services Digital Network) is to provide fully integrated digital services to users. Digital subscriber loops can be two types: basic rate interface(BRI) and primary rate interface(PRI). Each type is suited to a different level of customer needs. The basic rate interface (BRI) specifies a digital large pipe that contains three smaller pipes, two for the B channels and one for the D channels. The BRI is designed to meet the needs of residential and small-office customers. In most cases, there is no need to replace the existing local-loop cable. The same twisted-pair local loop that delivers analog transmission can used to handle digital transmission. Occasionally, some condition of the line is necessary.

One of the company that provide us BRI and PRI products is Merge Technology Group, founded in 1992. Merge Technologies Group manufactures products for DSL (Digital Subscriber Line), including ISDN BRI and PRI testing, development and demonstration. Their ISDN Central Office Emulator is an award winning design, providing high quality, easy to use ISDN emulation at an affordable price. Their exciting new Multi Format DSL Emulation Platform is a modular system prepared for an array of future formats.

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