handout1 Flashcards
(33 cards)
The act if transmitting and exchanging information between people, people and objects, and objects and objects through various media and actions. Its ultimate purpose is to help people communicate more efficiently and create better lives from it.
Communication
The largest computer network in the world. Its predecessor, Advanced Research Projects Agency Network (ARPnet), was born in 1969
Internet
This refers to a sign or
indication that conveys information about something
or that tells someone to do something.
Means of communication
This refers to an event
or act, which shows that something exists or that
gives information about something
Communicated information
This refers to a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted via telegraphy, telephony, radio, radar, or television
Electronics transmitted information
its main purpose is to ensure that the synchronization between the sender and receiver over a physical medium is maintained, as well as support transmission of the data signal in a form that can be interpreted by both the sender and receiver
Signal
Example of signals
- Electrical signals
- Acoustic signals
- Video signals
-Biological signals - Noise
it refers to disturbances in that energy to travel through a medium from one location to another
Waves
it refers to the horizontal distance of a wave from point to the corresponding point on the next wave. This is measured in meters (m) in SI
Wavelength
It refers to a vertical distance from a given point on the wave from the horizontal axis. In layman’s terms, it is the height above and below the x - axis. This is measured in volts, amperes, or watts, depending on the type of signal
Amplitude
it describes the position of the waveform relative to time zero; it is a measurement of the delay of the wave relative to some fixed reference point or another sine wave
Phase
it refers to the number of waves made per second or as a cycles per second. It is the reciprocal of the period to complete one (1) wave cycle. The unit for frequency is in Hertz (Hz); 1 Hz means 1 cycle per second (cps)
Frequency
This refers to the amount of time (expressed in seconds) required to complete one (1) full cycle
Period
it is a wave in which both the amplitude and time continuously vary over their respective intervals that results in a wavy characteristic.
Analog wave
it is a wave with several discrete (jumpy) states, such as high or low, and on or off. It has fixed amplitude , but its pulse width and frequency can be changed. An example of this signal is the data stored in the memory of a computer in the form of 0s and 1s
Digital wave
computers facilitate information exchange and resource sharing from one location to another through some sort of wiring/cabling or waves that act as a physical path , which carries electrical or electromagnetic signals between a transmitter and a receiver
Networking media
this networking media use cables and are limited by physical geography
Wired or Bounded media
In contrast to wired or bounded media, these networking media do not use any cables in transmitting data and is not bounded by physical geography
Wireless or unbounded mobile
a connection wherein data flows in one (1) direction only (unidirectional). This type is either transmit -only or receive-only
Simplex mode
a connection wherein data can flow in both directions, but not simultaneously (both at the same time) over a shared physical medium
Half-duplex mode
a connection wherein data simultaneously flows in both directions
Full duplex mode
a transmission in which data with each bit lining up in a series as the bits are sent over a single wire at a time
Serial transmission
a transmission wherein a group of bits is sent simultaneously, but each uses a different channel
Parallel transmission
refers to a wireless medium that is used for short-range communication (e. g. remote control devices,
intruder alarms, infra-red photography, and radiant heaters) in a closed area using line-of-sight propagation.
o It is achieved using transmitters/receivers (transceivers) that modulate non-coherent infrared light.
Infrared
