Device Overview
The Multipoint Switching and Conferencing Unit (MUSAC) combines a time switch unit (MTSC) and a powerful signal processor on one chip. The MUSAC enhances the capabilities of a PBX by supporting teleconferencing and multipoint data communication over voiceband channels. Digital signal processing techniques are used to implement the conferencing algorithms. Up to 64 channels of the 512 incoming PCM channels may be manipulated by the signal processor and output to any of 256 outgoing PCM channels. All functions are programmed and controlled via an 8-bit standard µP interface (Motorola or Intel type).

Features
Switching
● Time/space switch for 2048-, 4096- or 8192-kbit/s PCM systems
● Switching of up to 512 incoming PCM-channels to up to 256 outgoing PCM channels
● 16 input and 8 output PCM lines
● Different kinds of modes (2048, 4096, 8192 kbit/s or mixed mode)
● Configurable for primary access and standard applications
● Programmable clock shift with half clock step resolution for input and output in primary access configuration
● Configurable for a 4096- and 8192-kHz device clock
● Tristate function for further expansion and tandem operation
● Tristate control signals for external drivers in primary access configuration
● 2048-kHz clock output in primary access configuration
● Space switch mode

Multipoint Switching
● Multiple independent LAN’s within one PBX
● Multiplexing of up to 64 channels
● 64-kbit/s channels

Conference Mode
● Up to 64 conference channels in any combination
● Up to 21 independent conferences simultaneously (3 subscribers)
● Programmable attenuation (0/3/6/9 dB) on each input channel
● Programmable attenuation (0/3 dB) on each output channel
● Programmable PCM-level adaption (attenuation or amplification) of up to 64 channels
● Programmable noise suppression (four thresholds)
● Conference overflow handling
● Tone insertion capability
● A-law / µ-law compatible
● Compatible with all kinds of PCM-byte formats

General
● 8-bit Motorola or Intel type µP interface
● Single + 5-V power supply
● Advanced low power CMOS technology
● TTL-compatible inputs/outputs