Motorola HT 1000 service manual Glossary, Alc

Glossary

A/D	Analog to Digital converter; converts an instantaneous dc voltage level to a
	corresponding digital value.
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.
CMOS	Complementary metal-oxide semiconductor.
Channel	Defines conventional transmit and receive frequencies and muting conditions.
Closed Architecture	A controller configuration that utilizes a microcontroller with no external
	memory (non-FLASHport operation).
CBI	(Customer Board Initialization) When the controller board is received, it will
	need a serial from the defect unit. The serial is manually entered via the RSS
	prior to proceeding any further with the replacement process.
D/A	Digital to Analog converter; converts a digital value to a corresponding dc
	voltage value.
DTMF	Dual Tone Multi-Frequency.
DPL	Digital Private-Line.
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.
Flashcode	A Motorola term (model option definition code) that determines what
	FLASHport options are in a radio.
FLASHport	A Motorola term that describes the ability of a radio to change memory. Every
	FLASHport radio contains a FLASHport EEPROM memory chip that can be
	software written and rewritten to, again and again.
IC	Integrated Circuit.
ISW	Inbound Signalling Word; data transmitted on the control channel from the
	subscriber unit to the central controller.
LTR	Logic Trunked Radio; a registered trademark of E.F. Johnson Company.
MCU	MicroControl Unit.
MDC	Motorola Digital Code.
OMPAC	Over-Molded Pad-Array Carrier; a Motorola custom IC package, distinguished by
	the presence of solder balls on the bottom pads.
Open Architecture	A controller configuration that utilizes a microprocessor with extended ROM,
	RAM, and EEPROM, (FLASHport capable).
OSW	Outbound Signalling Word; data transmitted on the control channel from the
	central controller to the subscriber unit.
PC Board	Printed Circuit board.
PL	Private-Line® tone squelch; a continuous sub-audible tone that is transmitted
	along with the carrier.

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