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 Signalling Filter Integrated Circuit
BKC Bad Key Chirp
CD Compact Disk
CMP Compression
CPS Customer Programming Software
CSQ Carrier Squelch
DTMF Dual-Tone Multifrequency
DPL Digital Private-Line™
EEPROM Electronically Erasable/Programmable Read-Only Memory: used by the radio to store its
personality
EPP Environmental Preferred Product
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.
GKC Good Key Chirp
ISW Inbound Signalling Word: data transmitted on the control channel from a subscriber unit
to the central control unit.
LH DATA Longhorn Data: a bidirectional 0-5V, RS-232 line protocol 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.
MCU Micro Controller Unit
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.
OMPAC Over-Molded Pad-Array Carrier: a Motorola custom package, distinguished by the
presence of solder balls on the bottom pads.
PC Board Printed Circuit Board
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