Motorola GP88s Service Manual page 189

GLOSSARY OF TERMS
Term
ALC
ASFIC
CD
CMP
CPS
CSQ
DTMF
DPL
EEPROM
Firmware
FGU
GaAs
ISW
LH DATA
LLE
LSH
MCU
MRTI
OMPAC
PC Board
Automatic Level Control: a circuit in the transmit RF path that controls RF pow-
er amplifier output, provides leveling over frequency and voltage, and protects
against high VSWR (Voltage Standing Wave Ratio).
Audio Signalling Filter Integrated Circuit
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 can-
not be altered or reprogrammed.
Frequency Generation Unit
Gallium Arsenide: a type of crystalline material used in some semiconductors.
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 that uses the microntroller's
integrated RS-232 asynchronous serial communications interface (SCI) pe-
ripheral.
Low Level Expander: slight amount of volume expansion; used to improve the
signal to noise ratio.
Low-Speed Handshake: 150 baud digital data sent to the radio during trunked
operation while receiving audio.
Micro Controller Unit
Motorola Radio-Telephone Interconnect: a system that provides a repeater
connection to the Public Switched Telephone Network (PSTN). The MRTI al-
lows 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
Definition
G-1