G-1
Glossary of Terms
Term Definition
ALC Automatic Level Control: a circuit in the transmit RF path that controls RF power
amplifier output, provides leveling over frequency and voltage, and protects against
high VSWR (Voltage Standing Wave Ratio).
ASFIC Audio Signaling Filter Integrated Circuit
CD Compact Disk
CMP Compression
CPS Customer Programming Software
CSQ Carrier Squelch
DTMF Dual-Tone Multi-Frequency
DPL Digital Private-Line™
EEPROM Electronically Erasable/Programmable Read-Only Memory: used by the radio to store
its personality
Firmware Software, or a software/hardware combination of computer programs and data, with a
fixed logic configuration stores in a read-only memory. Information cannot be altered
or reprogrammed.
FGU Frequency Generation Unit.
GaAs Gallium Arsenide: a type of crystalline material used in some semiconductors.
ISW Inbound Signalling Word: data transmitted on the control channel from a subscriber
unit to the central control unit.
LCD Liquid Crystal Display: a module used to display the radio’s current operating channel
or system and scan status.
LH DATA Longhorn Data: a bidirectional 0-5V, RS-232 line that uses the Microcontroller’s
integrated RS-232 asynchronous serial communications interface (SCI) peripheral.
LLE Low Level Expander: slight amount of volume expansion; used to improve the signal
to noise ratio.
LSH Low-Speed Handshake: 150 baud digital data sent to the radio during trunked
operation while receiving audio.
MDC Motorola Digital Communication
MRTI Motorola Radio-Telephone Interconnect: a system that provides a repeater
connection to the Public Switched Telephone Network (PSTN). The MRTI allows the
radio to access the telephone network when the proper access code is received.
MSK Minimum-Shift Keying
OMPAC Over-Molded Pad-Array Carrier: a Motorola custom package, distinguished by the
presence of solder balls on the bottom pads.
OSW Outbound Signaling Word: data transmitted on the control channel from the central
controller to the subscriber unit.
PC Board Printed Circuit Board
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