Motorola Cp185 Basic 68007024004 Manual

							Glossary of Terms
Term Definition
ALCAutomatic 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
BKCBad Key Chirp
CD Compact Disk
CMPCompression
CPS Customer Programming Software
CSQCarrier Squelch
DTMF Dual-Tone Multifrequency
DPLDigital Private-Line™
EEPROM Electronically Erasable/Programmable Read-Only Memory: used by the radio to store its 
personality
EPPEnvironmental 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.
FGUFrequency Generation Unit
GaAs Gallium Arsenide: a type of crystalline material used in some semiconductors.
GKCGood Key Chirp
ISW Inbound Signalling Word: data transmitted on the control channel from a subscriber unit 
to the central control unit.
LH DATALonghorn 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.
MCUMicro 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.
OMPACOver-Molded Pad-Array Carrier: a Motorola custom package, distinguished by the 
presence of solder balls on the bottom pads.
PC Board  Printed Circuit Board 
						

							G-2 
PLPrivate-Line® tone squelch: a continuous sub-audible tone that is transmitted along with 
the carrier.
PLL Phase-Locked Loop: a circuit in which an oscillator is kept in phase with a reference, 
usually after passing through a frequency divider.
PTTPush-To-Talk: the switch located on the left side of the radio; when pressed, causes the 
radio to transmit.
RAM Random Access Memory: the radio’s RAM is loaded with a copy of the EEPROM data.
RegistersShort-term data-storage circuits within the microcontroller.
RESET Reset line: an input to the microcontroller that restarts execution.
RF PARadio Frequency Power Amplifier
ROM Read Only Memory
RSSIReceived Signal-Strength Indicator: a dc voltage proportional to the received RF signal 
strength.
RPT/TA Repeater/Talk-Around
SoftpotA computer-adjustable electronic attenuator
Software Computer programs, procedures, rules, documentation, and data pertaining to the 
operation of a system.
SPI (clock and data 
lines)Serial Peripheral Interface: how the microcontroller communicates to modules and ICs 
through the CLOCK and DATA lines.
Squelch Muting of audio circuits when received signal levels fall below a pre-determined value.
Standby ModeAn operating mode whereby the radio is muted but still continues to receive data
TOT Time-Out Timer: a timer that limits the length of a transmission.
TPLTone Private-line
µC Microcontroller
µPMicroprocessor
UHF Ultra High Frequency
VCOVoltage-Controlled Oscillator: an oscillator whereby the frequency of oscillation can be 
varied by changing a control voltage.
VCOBIC Voltage-Controlled Oscillator Buffer Integrated Circuit
VHFVery High Frequency
VSWR Voltage Standing Wave Ratio
Te r m D e f i n i t i o n