Motorola MTX8250 用户手册

Glossary-1

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 ration).

Audio Signaling Filter Integrated Circuit with voice compander.

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 stored 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.

Inbound Signalling Word: data transmitted on the control channel from a 
subscriber unit to the central control unit.

Liquid Crystal Display: a module used to display the radio’s current operating 
channel or system and scan status.

Lateral Diffusion MOS.

Longhorn Data: a bidirectional 0-5V, RS-232 line that uses the microcontroller’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.

Low-Speed Handshake: 150 baud digital data sent to the radio during trunked 
operation while receiving audio.

Trunked signaling protocol using low speed data. Registered trademark of E.F. 
Johnson Company.

Motorola Digital Communication.