RFL Communications 21 Sub-MUX Manual de usuario descargar pdf (Pagina 10)

Solutions for an evolving world.

Good to Know Comms TERMS for Relay Techs?

• Audio Channel A communications channel using discrete analog

signals to carry information, the signals can be simple on or

off, FSK (two or more frequencies), modulated. i.e. Audio

TPS, Telephone (POT), Music on the radio, using voice

frequency 300-4000 Hz (Audio) 30 kHz to 500 kHz (PLC)

even a laser LEDs can carry audio signals. 2-Wire vs. 4wire

• Amplitude Modulated Amplitude modulation (AM) is a modulation technique used in electronic

communication, most commonly for transmitting information via a radio

carrier wave. AM works by varying the strength (amplitude) of the carrier

in proportion to the waveform being sent. That waveform may, for

instance, correspond to the sounds to be reproduced by a loudspeaker.

PLC=Basically means ON for transmit and receive and

Off or no data. i.e PLC (Power Line Carriers)

• Frequency Modulation In telecommunications and signal processing, frequency modulation (FM)

is the encoding of information in a carrier wave by varying the

instantaneous frequency of the wave.

DS0-Channel module 64Kbps audio/digital

RFL Communications 21 Sub-MUX Manual de usuario Pagina 10