ecomms Flashcards
Basic Components
a transmitter, a communication channel (medium), and a receiver.
is an interference that degrades the transmitted
information.
noise
Converts the message into an electronic signal suitable for transmission.
transmitter
Electrical Conductors
Includes wires, coaxial cables, and twisted-pair cables.
Fiber-optic cables carry messages using light waves, commonly
used for long-distance communication.
Optical Media
nterferes with the communication process and is a significant issue in
receivers.
Noise
FreeSpace
Radio (wireless communication) uses the electromagnetic spectrum
to transmit signals through electric and magnetic fields.
Other Media
Includes sonar (using water), the earth itself, and AC power lines
(carrier current transmission or power line communications)
Receiver
Converts the transmitted signal back into a human-understandable form.
Signal degradation occurs over distance and is proportional to the square
of the distance.
Attenuation:
Transceivers:
These are devices that can both transmit and receive signals, commonly
found in phones, radios, and modems.
Two-way communication where both parties can transmit and
receive simultaneously, such as in telephone conversations.
Full Duplex
are continuously varying voltages or currents
Analog Signals
ASCII
American Standard Code for Information Interchange
Two-way communication where transmission is alternated between
parties.
Half Duplex:
are the original information signals, whether analog
or digital.
Baseband Transmission