Nikon CM200 service manual Glossary of Terms, Term Definition

Glossary G-i

GLOSSARY

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 pro-
	tects against high VSWR (Voltage Standing Wave Ratio).
ASF IC	Audio Signalling Filter Integrated Circuit with voice compander.
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.
Firmware	Software, or a software/hardware combination of computer programs and data,
	with a fixed logic configuration stored in a read-only memory. Information can-
	not 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 sub-
	scriber 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.
LDMOS	Lateral Diffusion MOS.
LH DATA	Longhorn Data: a bidirectional 0-5V, RS-232 line that uses the microcontroller’s
	integrated RS-232 asynchronous serial communications interface (SCI) periph-
	eral.
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 Data 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.