WIRED COMMUNICATIONS (prelim) Flashcards
The transmission of data over a wire-based communication technology.
Wired Communications
It allows more than one signal to be transmitted in a single medium
Multiplexing
Wired line used for high-power applications
Waveguides
The three basic components of the optical transmission system
Light source
Transmission media
Detector
A type of medium that transmits information in the form of light
Fiber Optic
This signal is a continuous signal that varies in amplitude or frequency over time and represents information.
Analog Signal
This signal is a discrete signal, typically represented by binary values (0s and 1s), used for representing information.
Discrete Signal
An electronic device that converts information into a signal suitable for transmission over a medium.
Transmitter
An electronic device that detects and interprets the transmitted signal to retrieve the original information.
Receiver
Another term for the demodulation process
Detection
A type of medium that is immune to Electromagnetic interference
Fiber Optic
Type of medium that transmits signals or data in the form of electronic signals
Copper Wire
This type of medium has a high bandwidth
Fiber Optic
This type of medium is prone to corrosion
Copper wire
One of the disadvantages of this medium is its limited bandwidth
Copper Wire
This type of medium has high attenuation
Copper wire
It is the term for information, audio and voice signals
Intelligence
The physical path over which a signal can travel
Communication Circuit
The actual path for the signal to travel
Communication Channel
This circuit uses AD and DC to carry signal
Electric Circuit
This uses rapidly varying current to carry signal
Electromagnetic Circuit
This uses light as the data carrier on a transparent media
Photonic Circuits
It is used for types of remote control electrical equipment and in some LANs
Power Line Communication
It is when electronic signals are added to power line voltages
Power Line Communications
It is the unwanted coupling between the signal path
Crosstalk
When the signal from one cable leaks with another pair
Crosstalk
This avoids crosstalk
Twisting cables
This type of cable is commonly used as an Ethernet cable
Unshielded Twisted Pair
It is the radiation of one signal to another
crosstalk
This type of cable is best suited in high interference environment
Shielded Twisted Pair
This cable has an individual pair of wires wrapped in foil and then are wrapped again for double protection
Shielded Twisted Pair
This cable has each pair of ire twisted together and then wrapped in tubing without any other protection
Unshielded Twisted Pair
Which part of the coaxial cable is shielded?
Ground
The bandwidth for coaxial cable
300MHZ, 500MHZ, 750MHZ
This type of wire is commonly used in telephone system
Twisted Pair
This cable is used in Ethernet networks
Twisted Pair
This technique reduces electromagnetic interference from external sources
Twisting of wires
This wire provides varying levels of protection against signal degradation and interference.
Twisted Pair
two types of Twisted pair wire
Shielded Twisted Pair
Unshielded Twisted Pair
It is the reduction of the signal as it travels in the medium
Attenuation
This helps the signal to keep a constant level as it travels through the medium
amplifiers
This cable has the greatest bandwidth among the three types of cable
Fiber Optic Cable
This cable is made up of very small one-way glass strands.
Fiber Optic Cable
This cable is commonly used in highspeed backbones
Fiber Optic Cable
This cable uses light rather than electricity
Fiber Optic Cable
The process of making the information more suitable for the medium
Modulation
This process allows more than one signal to be transmitted over a single medium
Multiplexing
The device which converts signals from Analog to Digital and back again
Modem
The high-frequency signal is added to the original signal to allow transmission over long distances
Carrier
A fiber optic technique that employs multiple light wavelengths to transmit data
Dense Wave Division Multiplexing
Frequency range used in power lines
ELF
The frequency range known as subcarriers is mostly used in aeronautical and marine communications
LF
range for infrared
100 to 0.7 micrometers
range for ultraviolet
4 to 400 nanometers
Type of wireless transmission media that distribute signals through air over long distances
Broadcast Radio
Type of wireless transmission media used in mobile communications
Cellular Radio
Type of wireless transmission media that uses HF range to transmit voice or data
Cellular Radio
This type of wireless transmission media provides highspeed transmission
Microwave
Wireless transmission media that uses infrared to transmit data
Infrared
Type of twisted pair cable that has a 10 Mbps transfer rate
10-BaseT (Ethernet)
Type of twisted pair cable that has a 100 Mbps transfer rate
100-BaseT (Fast Ethernet)
Type of twisted pair cable that has a 1000 Mbps transfer rate
1000-BaseT (Gigabit Ethernet)
Type of twisted pair cable that has a 4-16 Mbps transfer rate
Token Ring
Two types of coaxial cable that have 10Mbps transfer rate
10-Base2 (Ethernet)
10-Base5 (Fast Ethernet)
Type of fiber optic that has a 10Mbps transfer rate
10-BaseF (Ethernet)
Type of fiber optic that has a 100Mbps transfer rate
10-BaseFX (Fast Ethernet)
what does FDDI mean?
Fiber Distributed Data Interface
A one-way electronic communication
Simplex
Radio Broadcasting is what type of communication?
Simplex
A two-way communication in which both parties can transmit and receive simultaneously
Full Duplex
A two-way communication in which both parties can transmit and receive signals one at a time
Half Duplex
How many times an event occur at a time
Frequency
The distance between two points of a similar periodic wave
Wavelength
The distance travelled by an electromagnetic wave in one cycle
wavelength
The portion of the electromagnetic spectrum that is occupied by a signal
bandwidth
The range of frequencies in which signals are transmitted
bandwidth
Also known as myriametric signal
VLF
Also known as kilometric signal
LFA
known as hectometric signal
MF
High frequencies are also known as
decametric signal
other term for very high frequencies
metric signals
other term for ultrahigh frequencies
decimetric signals
widely used in satellite communications
EHF
What is the other term for SHF
centimetric signal
also known as EHF
millimetric signals
commonly used in satellite and radar communications
EHF
indicates the relationship between two power
decibel
The oldest form of communication recorded in history. It is used during war
Smoke signals
The greek word “helios” means
sun
It is a type of early communication in which it uses mirror, sun, and morse code to transfer messages wirelessly
Heliograph
The Greek word for write is
Graphien
who invented the semaphore?
Mr. Claude Chappe
When did Chappe invent the semaphore?
1794
This early communication system used a flag-based alphabet
semaphore
who discovered the effect of electrolytic decomposition to
devise an electric telegraph.
Samuel Soemmerring
A type of device used for communication over long distances in which the message can be read by the amount of gases the electrolysis caused
Electromechanical telegraph
He discovered the effect of electrolytic decomposition to
devise an electric telegraph.
Samuel Soemmering
It is the first successful electric telecommunication device
Needle telegraph
Who patented the needle telegraph?
Charles Wheatstone and William Fothergill
It is the first successful and practical data communication code to transmit info
Morse’s Telegraph
A type of telegraph that alphabets and numbers are placed at the edge of a circular plate
Dial Telegraph
He developed the automatic telegraph
Thomas Edison
A device that uses messages encoded on perforated paper
Automatic Telegraph
A 28-key piano-like device that transmits information by pressing the key corresponding to the letter.
Printing Telegraph
who invented the printing telegraph?
Royal Earl House
He invented the string telephone
Robert Hooke
A communication device in which it transmits data in long wires through mechanical vibrations.
String Telephone
what are the two other terms for string telephone?
Acoustic telephone and Mechanical telephone
He developed the speaking telegraph
Innocenzo Manzetti
when did Innocenzo Manzetti invent the speaking telegraph?
1843
He suggested that sound could be transmitted electrically
Charles Boursel (1854)
He developed a voice communication in his house and called it “telettrofoni”
Antonio Meucci
When did Meucci develop telettrofoni in his house?
1857
He developed a device that could transmit electrical notes
Johann Philipp Reis (1860)
He described his device “Telephon”
Johann Philipp Reis (1860)
He designed a voice transmitter consisting of a cavity filled with
granules of carbonized anthracite coal.
Thomas Alva Edison
when did the concept of mounting the transmitter and receiver in the same handle?
1878
When was the first commercial telephone available?
1877
The year AT&T produced the wall magneto telephone
1907
the year desk telephones are available
1897
The year AT&T introduced the E1A Headset
1927
The year when the first telephone that has all components in a single apparatus
1937
The year push-button telephones are available
1963
VoIP meaning
Voice over Internet Protocol
The first combined telephone and personal digital assistant
IBM Simon
