Glossary-2
LED Light Emitting Diode: An electronic device that lights up when electricity
is passed through it.
MDC Motorola Digital Communications.
MHz Megahertz: One million cycles per second. Used especially as a radio-
frequency unit.
MOR Ministry of Railway
MPT Ministry of Posts and Telecommunication.
NKP Non Keypad Model
Paging One-way communication that alerts the receiver to retrieve a message.
PC Board Printed Circuit Board. Also referred to as a PCB.
PL Private-Line Tone Squelch: A continuous sub-audible tone that is
transmitted along with the carrier.
Programming Cable A cable that allows the CPS to communicate directly with the radio
using USB.
Receiver Electronic device that amplifies RF signals. A receiver separates the
audio signal from the RF carrier, amplifies it, and converts it back to the
original sound waves.
Repeater Remote transmit/receive facility that re-transmits received signals in
order to improve communications range and coverage (conventional
operation).
RF Radio Frequency: The portion of the electromagnetic spectrum between
audio sound and infrared light (approximately 10 kHz to 10 GHz).
RX Receive.
Signal An electrically transmitted electromagnetic wave.
Spectrum Frequency range within which radiation has specific characteristics.
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.
TIA Telecommunications Industry Association
TOT Time-out Timer: A timer that limits the length of a transmission.
TPL Tone Private Line.
Transceiver Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
Term Definition
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