Glossary - Motorola EP450 Basic Service Manual

Glossary of Terms
Term
ALC
ASFIC
BKC
CD
CMP
CPS
CSQ
DTMF
DPL
EEPROM
Firmware
FGU
GaAs
GKC
ISW
LH DATA
LLE
MCU
MRTI
OMPAC
PC Board
PL
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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).
Audio Signalling Filter Integrated Circuit
Bad Key Chirp
Compact Disk
Compression
Customer Programming Software
Carrier Squelch
Dual-Tone Multifrequency
Digital Private-Line™
Electronically Erasable/Programmable Read-Only Memory: used by the radio to
store its personality
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.
Frequency Generation Unit
Gallium Arsenide: a type of crystalline material used in some semiconductors.
Good Key Chirp
Inbound Signalling Word: data transmitted on the control channel from a sub-
scriber unit to the central control unit.
Longhorn Data: a bidirectional 0-5V, RS-232 line protocol that uses the micro-
controller's integrated RS-232 asynchronous serial communications interface
(SCI) peripheral.
Low Level Expander: slight amount of volume expansion; used to improve the
signal to noise ratio.
Micro Controller Unit
Motorola Radio-Telephone Interconnect: a system that provides a repeater con-
nection to the Public Switched Telephone Network (PSTN). The MRTI allows the
radio to access the telephone network when the proper access code is received.
Over-Molded Pad-Array Carrier: a Motorola custom package, distinguished by
the presence of solder balls on the bottom pads.
Printed Circuit Board
Private-Line® tone squelch: a continuous sub-audible tone that is transmitted
along with the carrier.
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Definition