'DIGITAL SWITCH' related articles 2

  1. 2009/08/17 IMP8980D - PCM Digital Switch
  2. 2008/07/08 MT89L80 - CMOS ST-BUSTM Family Digital Switch
General Description
This CMOS device is designed for switching PCM-encoded voice or data,under microprocessor control, in a modern digital exchange, PBX or Central Office. It provides simultaneous connections for up to 256 64kbit/s channels. Each of the eight serial inputs and outputs consist of 32 64kbit/s channels multiplexed to form a 2048kbit/s ST-BUS stream. In addition, the IMP8980D provides microprocessor read and write access to individual ST-BUS (Serial Telecom Bus) channels.

Features
*ST-BUS compatible
*8-line x 32-channel inputs
*8-line x 32-channel outputs
*256 ports non-blocking switch
*Single power supply (+5V)
*30mW power consumption
*Microprocessor-control interface
*Pin-compatible with Mitel MT8980

IMP8980DC, IMP8980DE, IMP8980DP, IMP8980DP/T

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Description
This VLSI CMOS device is designed for switching PCM-encoded voice or data, under microprocessor control, in a modern digital exchange, PBX or Central Office.
It provides simultaneous connections for up to 256 64 kbit/s channels.
Each of the eight serial inputs and outputs consist of 32 64 kbit/s channels multiplexed to form a 2048 kbit/s ST-BUS stream.
In addition, the MT89L80 provides microprocessor read and write access to individual ST-BUS channels.

Features
* 3.3 volt supply
* 5 V tolerant inputs and TTL compatible outputs.
* 256 x 256 channel non-blocking switch
* Accepts serial streams at 2.048 Mb/s
* Per-channel three-state control
* Patented per channel message mode
* Non-multiplexed microprocessor interface
* Zarlink ST-BUS compatible
* Low power consumption: typical 15 mW
* Pin compatible with the MT8980DP

Applications
* Key telephone systems
* PBX systems
* Small and medium voice switching systems

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