User's Manual

OSMAC Base User Manual
Page 39
Manu.01_0405
11 Specifications
Principles of Operation
The OSMAC Base is a multi-functional unit which can be used to communicate between the built-in
speaker/microphone, pagers, two-way radios and the telephone interface. The internal circuitry is
comprised of numerous elements as shown on the block diagram below. These include radio
transceiver, telephone interface, microprocessor, front panel I/O, DTMF encoder/decoder, CTCSS
encoder/decoder, speech synthesizer (DAC), microphone amplifier, speaker amplifier, analog filters,
limiting amplifier and analog switch matrix. The microprocessor controls all circuitry as needed for the
desired communication function. The encoders generate needed audio signals and the decoders
detect incoming control signals on the received audio. Analog switches route the analog signals within
the unit.
OSMAC Base Block Diagram
Encoder/Terminal general
Paging Format.................................................POCSAG ( tone, numeric, and alpha at 512, 1200 or
2400bps)
TWO-TONE and GROUP-TONE optional
Squelch formats ..............................................CTCSS or carrier squelch
Serial port protocols ........................................TAP, COMP2, COMP1
Pager database maximum size........................1000 individual pagers
Maximum page length.....................................250 characters
Maximum pre-programmed alarm message.....40 characters
Maximum number of pager groups ..................16
Maximum number of pagers per group ............75
LCD display size .............................................20 characters X 2 lines
Speaker audio.................................................1 watt maximum at <5% THD
Power supply ..................................................External 12.0V&5.0VDC, 2A, DIN connector.
Weight ............................................................3.5lbs.
Temperature range..........................................-10-+40C
Processor........................................................80386EX
Non-volatile flash memory size........................2M bytes
External keyboard interface.............................Standard PS/2
Telephone interface.........................................RJ-11 female, DTMF signaling
Speake
Mic
Control
Antenn
Analog
Switch
Matrix
Radio
Transceiver
Front
Panel
Filter
Limiter
Telephone
Interface
Phone
DTMF
CTCSS
DAC
Microprocesso
r
RS232 Port 1
RS232 Port 2
Keyboard
Alarm