Motorola PM1200, Базовое руководство по обслуживанию

Страница: 132 / 138

October 26, 2007 6880309U09-A
Glossary-6
RPCIC Regulator/power control IC.
RTC See real-time clock.
RX Receive.
RX DATA Recovered digital data line.
SAP See Serial Audio Port.
Serial Audio Port SSI to and from the CODEC used to transfer transmit and receive audio
data.
Serial Peripheral
Interface A serial interface comprised of two data lines and a clock line. This
interface is typically used to communicate with other modules and ICs in
the radio.
signal An electrically transmitted electromagnetic wave.
software Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
spectrum Frequency range within which radiation has specific characteristics.
SPI See Serial Peripheral Interface.
squelch Muting of audio circuits when received signal levels fall below a pre-
determined value. With carrier squelch, all channel activity that exceeds
the radio’s preset squelch level can be heard.
SRAM See static RAM.
SSI See Synchronous Serial Interface.
Standby mode An operating mode in which the radio is muted but still continues to
monitor data.
static RAM A type of memory used for volatile, program/data memory that does not
need to be refreshed.
Synchronous Serial
Interface DSP interface to peripherals that consists of a clock signal line, a frame
synchronization signal line, and a data line.
time-out timer A timer that limits the length of a transmission.
TOT See time-out timer.
transceiver Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
transmitter Electronic equipment that generates and amplifies an RF carrier signal,
modulates the signal, and then radiates it into space.
TX Transmit.
Term Definition