Communication circuits

electrical data cable consisting of several twisted pairs

waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information

common type of radio receiver that shifts the received signal to an easily-processed intermediate frequency

thumb|right|120px|An Ontario Highway 407 toll transponder circa 2009

control system generating an output signal whose phase is fixed relative to the phase of the input signal, keeping input and output frequencies the same

communication flowing in both directions simultaneously

nonlinear electrical circuit that creates new frequencies from two signals applied to it

system that allows direct communication between the leaders of the United States and Russia

electronic circuit to automatically adjust signal strength

Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification. It is primarily a means of testing the communications infrastructure.

means of transporting data over a packet-switched network so as to emulate a dedicated physical link between nodes

private telecommunications circuit

communication channel that sends information in one direction only

communications channel that connects two or more communicating devices

frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs; part of a phase-locked loop

method for electrically transmitting information using two complementary signals

In telecommunications, trunking is a technology for providing network access to multiple clients simultaneously by sharing a set of circuits, carriers, channels, or frequencies, instead of providing individual circuits or channels for each client. This is reminiscent to the structure of a tree with one trunk and many branches. Trunking in telecommunication originated in telegraphy, and later in telephone systems where a trunk line is a communications channel between telephone exchanges.

signalling

electronics circuit extension

radio circuit

electronic circuit that takes a high-frequency amplitude modulated signal as input and provides an output which is the envelope of the original signal

electronic system for generating any of a range of frequencies

device to convert Morse code radio signals into audible tones

electronic circuit that generates an output signal whose output frequency is a harmonic of its input frequency

preventing or removin echo in telephony

electrical signalling scheme

connection of a phone to a non-local office

serial communications scheme

oscillator whose frequency can be tuned over some range

communication subsystem on an integrated circuit

Component for guiding radio waves

direct communication system between South Korea and North Korea

signal transmission mechanism in wires

phase-locked loop based demodulator circuit

transfer of energy from one electrical medium or circuit segment to another

Circuit within a circuit