roam
To use a network or service from different locations or devices.
Electrical engineering
651 entries in this trade.
roaming
The ability to use a cell phone outside of its original registering zone.
roger
Received (used in radio communications to acknowledge that a message has been received and understood)
roger that
Received (used in radio communications to acknowledge that a message has been received and understood)
ROIP
Radio over IP: ROIP extends VOIP to radio repeaters and base stations.
rolling blackout
An intentional disruption of electric service to different areas in a region to conserve power.
rotary converter
A machine which converts alternating current to direct current, or vice versa.
rotary switch
A switch that is operated by turning a knob.
round-trip time
The time elapsed for a message to travel to a remote location and then return.
RS-232
Recommended Standard 232; the standard for serial binary signals between a DTE and a DCE.
RTT
Initialism of round-trip time.
rubber
To eavesdrop on a telephone call
RY
A test pattern consisting of a repeating character string alternating letters R and Y, used to test five-level teleprinter and radioteletype (RTTY) systems.
salient pole
A magnetic pole that projects toward the armature of an electric machine.
SAPS
Initialism of stand-alone power system/supply.
saturation
The condition at which a component of the system has reached its maximum traffic-handling capacity, i.e. one erlang per circuit.
SBPS
Initialism of standby power system/supply.
SCADA
Acronym of supervisory control and data acquisition, an electrical network typically containing at least IED's, RTU's, and a master station equipped with an HMI; used to monitor and control process automation systems, such as those used by electrical and water utilities.
scan line
One of the horizontal lines that compose a raster scanning pattern, as on a television or computer display.
scrubber
A horizontal bar allowing the user to set the playback position.
SDP
Initialism of service data point.
selfie
A photographic self-portrait, especially one taken manually (not using a timer, tripod etc.) with a small camera or mobile phone.
selfie stick
An extendable monopod arm onto which a smartphone or camera can be mounted in order to take wide-angle photographs of oneself.
send
An operation in which data is transmitted.
sequential logic
A form of digital circuit logic where the current outputs depend not only on the current inputs, but also on a memory of past inputs and states.
SerDes
A pair of functional blocks used in high-speed communications to compensate for limited input/output, converting data between serial data and parallel interfaces in each direction.
serial time-encoded amplified microscopy
A very fast real-time optical imaging technique.
servco
The part of a telco that provides customer service.
setup time
The minimum amount of time for which the data input should be held steady before the clock event for reliable sampling.
short circuit
A usually unintentional connection of low resistance or impedance in a circuit such that excessive and often damaging current flows in it.
shortwave
An electromagnetic wave with a relatively short wavelength; specifically, one with a wavelength generally between 10 and 100 metres, corresponding to a frequency between 3 and 30 megahertz.
signal
An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
signal processing
A subfield of electrical engineering focusing on analyzing, modifying and synthesizing signals, such as sound, images, potential fields, seismic signals, altimetry processing, and scientific measurements.
signalling event
A change of the state of a communication channel, each state representing a symbol that is to be transmitted.
silver box
A modified DTMF box that adds four additional keys, creating a four-column-by-four-key grid.
SIM
Acronym of Subscriber Identity Module.
simplex
adjectiveElectrical engineering
Of a circuit or device: involving signals which travel in one direction at a time; unidirectional.
single-phasing
The abnormal operation of a three-phase machine when its supply is changed by the accidental opening of one conductor.
slab line
A central conductor surrounded by two planar ground slabs.
slam
To move a customer from one service provider to another without their consent.
smartphone
A mobile phone with more advanced features and greater computing capacity than a feature phone.
SNAP
Acronym of Symbolic Network Analysis Program.
socket
An opening into which a plug or other connecting part is designed to fit (e.g. a light bulb socket).
software defined radio
A radio that creates and receives radio signals through software controlled DSPs (digital signal processors) with ADCs (analog-to-digital converters) and DACs (digital-to-analog converters).
solar generator
A battery box, capable of providing power in amounts like a generator. It is not a generator, not generating any electricity from fuel, merely storing power previously charged in the unit. The power stored in the unit does not necessarily need to be provided by solar panels, mains power can also be used to charge the unit, or any other electricity source. Input power may also be streamed directly as output power.
solar power
The conversion of energy from sunlight into electricity, either directly using photovoltaics, indirectly using concentrated solar power, or a combination of the two.
soundboard
A mixing console used to combine and blend different audio sources to a single output.
south pole
The negative pole of a magnetic dipole that seeks geographic south.
space charge
The localized excess electric charge in a specific volume; especially such a negative charge
space permeability
The ratio of magnetic induction to magnetizing force in a vacuum
spaghetti
Something physically resembling spaghetti (noun 1 sense 1) in appearance or consistency, or in being tangled.
speaking
Indication that the person requested is the same as the one who is currently speaking.
spectral gating
A signal processing technique used primarily for noise reduction and creative sound design; converting a signal into the frequency domain (a spectrogram), estimating a noise threshold for each frequency band, and then gating" (muting or reducing the volume of) any signal below that threshold.
spectrum
A set of frequencies that are used for radio-frequency communication; not necessarily a continuous range.
spim
Unsolicited messages sent to cellular phones.
spin magnetic moment
The part of the magnetic moment of an object that originates from its spin, rather than its movement, in which the magnetic field is generated when an electron rotates on its axis.
splice
The electrical and mechanical connection between two pieces of wire or cable.
SPM
Initialism of surface permanent magnet.
spot beam
A satellite signal that is specially concentrated in power (i.e. sent by a high-gain antenna) so that it will cover only a limited geographic area on Earth.
SPS
Initialism of smart power system/supply.