Product Descriptions

The MT8985 Enhanced Digital Switch device is an upgraded version of the popular MT8980D Digital Switch (DX). It is pin compatible with the MT8980D and retains all of the MT8980D's functionality. This VLSI device is designed for switching PCM-encoded voice or data, under microprocessor control, in digital exchanges, PBXs and any ST-BUS/MVIP environment. It provides simultaneous connections for up to 256 64 kb/s channels. Each of the eight serial inputs and outputs consist of 32 64 kbit/s channels multiplexed to form a 2048 kbit/s stream. As the main function in switching applications, the device provides per-channel selection between variable or constant throughput delays. The constant throughput delay feature allows grouped channels such as ISDN H0 to be switched through the device maintaining its sequence integrity. The MT8985 is ideal for medium sized mixed voice/data switch and voice processing applications.

Product Features

• 256 x 256 channel non-blocking switch

• Programmable frame integrity for wideband channels

• Automatic identification of ST-BUS/GCI interface backplanes

• Per channel tristate control

• Patented message mode

• Non-multiplexed microprocessor interface

• Single +5 volt supply

• Available in DIP-40, PLCC-44 and QFP-44 packages

• Pin compatible with MT8980 device

Product Applications

• Medium size digital switch matrices

• Hyperchannel switching (e.g., ISDN H0)

• ST-BUS/MVIP™ interface functions

• Serial bus control and monitoring

• Centralized voice processing systems

• Data multiplexer

Product Photos

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