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FEATURES
UNIVERSAL PABX T ONE GENERATOR
■ Generates PBX supervisory tones in
PCM format
■ Integrated time slot allocation circuitry
■ No noticeable level changes in tones
■ Frame synch. signal source (internal/
external) selectable
■ Eight tone programs
■ Eight independent PCM tone streams
within each program
4092 PDS039-SA9401-001 REV. C 07-05-96
SA9401
■ Each of these tone streams selectable
from 16 tone blocks
■ Seperate Intrude Tone for each pro-
gram
■ Choice of clock frequencies
■ Watchdog facility
■ Low power CMOS technology
PROGRAMMABLE FEATURES
■ Tone samples
■ Tone Cadence timing
■ Tone to time-slot mapping
■ Size of tone blocks
■ Intrude tone frequency
■ Intrude tone cadence
■ "silence sample" value
DESCRIPTION
The SA9401 operates in conjunction with a standard EPROM to generate the system
tone plans for the PABX systems of most major countries.
The high level of programmability allows the SA9401 to satisfy a wide variety of tone
plans. Furthermore by providing three inputs to select between one of eight tone
programs during initialisation, the device effectively facilitates the design of a universally
programmable "PABX Processor Card". Because the tone program inputs are latched
at the start of each PCM frame the SA9401 minimises the possibility of glitches.
The SA9401 can also generate the PCM Frame synchronising reference signal if
required.
