Motorola ASTRO XTS 3000 Service Manual page 18

Host Port
IC
IMBE
ISW
LSH
MCU
MDC
OMPAC
Open
Architecture
OSW
PC Board
PL
PLL
PTT
Registers
Repeater
RESET
RF PA
RSS
RPT/TA
RX DATA
Signal Qualifier
Mode
xiv
Parallel memory mapped interface consisting of eight registers in the
DSP56001.
Integrated Circuit
A sub-band, voice encoding algorithm used in ASTRO digital voice.
Inbound Signalling Word; data transmitted on the control channel from a
subscriber unit to the central control unit.
Low Speed Handshake; 150 baud digital data sent to the radio during trunked
operation while receiving audio.
MicroControl Unit
Motorola Digital Communications
Over-Molded Pad-Array Carrier; a Motorola custom IC package, distinguished
by the presence of solder balls on the bottom pads.
A controller configuration that utilizes a microprocessor with extended ROM,
RAM, and EEPROM.
Outbound Signalling Word; data transmitted on the control channel from the
central controller to the subscriber unit.
Printed Circuit board
Private-Line ® tone squelch; a continuous sub-audible tone that is transmitted
along with the carrier.
Phase-Locked Loop; a circuit in which an oscillator is kept in phase with a
reference, usually after passing through a frequency divider.
Push-To-Talk; the switch located on the left side of the radio which, when
pressed, causes the radio to transmit.
Short-term data-storage circuits within the microcontrol unit or
programmable logic IC.
Remote transmit/receive facility that re-transmits received signals in order to
improve communications coverage.
Reset line; an input to the microcontroller that restarts execution.
Radio Frequency Power Amplifier
Radio Service Software
RePeaTer/Talk-Around
Recovered digital data line.
An operating mode whereby the radio is muted but still continues to analyze
receive data to determine RX signal type.