Motorola XTS 2500 Service Manual page 905

Glossary
Term
A/D
ABACUS IC
ALC
CODEC
D/A
DSP
DSP Code
Firmware
FGU
FLASHcode
FLASHport™
FracN
Host
Analog-to-Digital converter; converts an instantaneous dc voltage
level to a corresponding digital value.
Custom integrated circuit providing a digital receiver intermediate
frequency (IF) backend.
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.
COder/DECoder.
Digital-to-Analog converter; converts a digital value to a corresponding
dc voltage value.
Digital Signal Processor. A microcontroller specifically tailored for signal
processing computations.
Digital Signal Processor Code; object code executed by the Digital
Signal Processor in an ASTRO XTS 2500/XTS 2500I/XTS 2000/ATS
3000 subscriber radio. The DSP is responsible for computation-
intensive tasks, such as decoding ASTRO signaling.
Code executed by an embedded processor such as the Host or DSP in
a subscriber radio. This type of code is typically resident in non-volatile
memory and as such is more difficult to change than code executed
from RAM.
Frequency Generation Unit. This unit generates ultra-stable, low-phase
noise master clock and other derived synchronization clocks that are
distributed throughout the communication network.
A 13-digit code which uniquely identifies the System Software Package
and Software Revenue Options that are enabled in a particular
subscriber radio. FLASHcodes are only applicable for radios which are
upgradeable through the FLASHport process.
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.
A Motorola-proprietary, CMOS fractional-N frequency synthesizer with
built-in dual-port modulation.
The Motorola microcontroller unit.
Definition
Glossary