elextech
問題一覧
1
The means of delivering and receiving data or information through a channel of communication
communication media
2
path that connects the sender and receiver for transmission of information over a network.
communication channel
3
serves as the means of communication while channel refers to the means of transmission of the message between a sender and a receiver (or audience)
medium
4
path that connects the sender and receiver for transmission of information over a network.
communication channel
5
is a group of computers linked to each other that enables the computers to communicate with each other and share their resources, data, and applications.
computer network
6
(wired or bounded media) Data signals are enclosed in a cabling media.
guided media
7
examples of guided media
twisted pair, coxial, fiber optics
8
A guided media that have characteristic of;
Speed: 10 mbps to 10 gbps
-Most popular
Used in LAN and Local Telephone Lines
Disadvantages
• Unsuitable for long distance
Characteristics
• Can carry voice and data signals • Copper wires pair are insulated by plastic
•Wires are twisted together in order to reduce noise It is of two types, Unshielded Twisted Pair(UTP) and Shielded Twisted Pair (STP). Inexpensive and easy to install and
twisted pair
9
A guided media that have characteristic of;
Speed: 10 mbps to 100 mbps
for long-distance telephone lines and LANS Single solid copper wire core that is covered by insulating material.
Characteristics
It is used for video transmissions for televisions or
Copper mesh is used to cover the insulated copper wire to protect from electromagnetic waves. Carries both analog and digital signals.
Carries high-frequency range signals It is of two types, thicknet and thinnet.
Disadvantages
Expensive than twisted pair Not compatible with twisted pair cable
coaxial cable
10
a guided media that have characteristic of;
Speed: 100 gbps+ Characteristics
Used for Internet or long distance communication Digital signals are sent as light puises which are
translated back into electrical signals • Fine glass strand surrounded by glass cladding and protective layer
single strand Secure and has very low signal loss.
Disadvantages
Expensive, difficult to install and modify. Difficult to repair
fiber optics
11
Electromagnetic waves of different frequencies are used
unguided media
12
5 examples of unguided media
microwave, radio wave, cellular, infrared, satellite
13
A unguided that have characteristic of;
Speed: 1 mbps to 10 gbps
Characteristics
Used for high speed transmission Information is sent via microwaves from ground based transmitting and receiving stations Text, sound, and graphics are converted into microwave pulses and transmitted Microwave stations (a.k.a. repeater stations) must be placed every 50 kilometres to receive, amplify, and then pass the signal along
Disadvantages
It cannot pass thru obstacles
Can only use line of sight transmission. • It also supports limited bandwidth
microwave
14
a an guided media that have characteristic of;
Speed: 1 mbps to 10 mbps
Characteristics
Used for cordless phones, AM & FM radio transmission for both voice and data. Can travel long distances and penetrates buildings
Requires a transmitter to send broadcast radio signals and a receiver to receive it The receivers uses an antenna to receive the signals
An example of the short-range broadcast radio is Bluetooth,
-Used in computers, mobiles, printers etc. -Transmit data at a rate of 1Mbps
Disadvantages
Unidirectional and insecure Interference such as reflections from water
radiowave
15
a unguided media that have characteristic of;
Speed: 10 mbps to 1 gbps
Characteristics
Used in wireless modems and cellular telephone Uses high-frequency radio waves to transmit
voice and digital data
• Can connect notebooks or mobile computers to the celluar telephone to access the Web or send and receive the email, etc Personal Communications Services (PCS) is a set of technologies used for digital cellular devices like Laptops, cellular telephones, etc.
Disadvantages
It requires complex infrastructure • Well planned frequency spectrum distribution
cellular radio
16
an unguided media that have characteristic of;
Speed: 1 gbps
Characteristics
• Used in remote controls for televisions, optical mouse and entertainment devices
• Sends signals using infrared light wave that is invisible to us and is just above the red end
of the colour spectrum. • It Works over a moderate bandwidth 115 kbps and works upto few meters.
• IRDA port is fixed to transfer data • Alternative to short-range range channel like Bluetooth.
Disadvantages It has short range and low bandwidth
• It requires a light of sight transmission.
infrared
17
a unguided media that have a characteristic of;
Speed: 1 mbps to 10 gbps
Characteristics
uplink
downlink
Disadvantages
Is used for global communication, Satellites are placed in space and they orbit the earth. Receives microwave signals from the earth station
Satellites magnify the signals and retransmit them back The data transfer speed is very high It avoids the cost of cabling and repeater stations The transmission from the earth station to a satellite is called uplink. The transmission from the satellite to the earth station is called the downlink.
it is expensive and not easy to repair and maintain Weather and sunspots cause signal disturbance
satellite
18
• The communication system in which there exists no wire or physical medium between transmitter and receiver.
• Examples are mobile phones, radio, bluetooth, Wi-Fi
wireless communication system
19
• The communication system in which we use cables, wires, or any physical media to transfer data or information using electrical or optical signals.
• Examples are telegraphs and telephones
wired communication system
20
thypes of communication channel
simplex, semi-duplex, full-duplex
21
it allows the sending of information in one direction only, which is similar to a one-way street. Examples: garage door opener, car key fob, wireless microphone, radio, tv
simplex
22
it is information can be sent in both directions, but it doesn't allow both directions to operate at the same time. Example: walkie- talkie
semi-duplex
23
its information can be carried in both directions at the same time. The 2 directions of information travel are Independent of each other. Examples: ordinary/mobile phone systems, telephone calls
full-duplex
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97問 • 14日前問題一覧
1
The means of delivering and receiving data or information through a channel of communication
communication media
2
path that connects the sender and receiver for transmission of information over a network.
communication channel
3
serves as the means of communication while channel refers to the means of transmission of the message between a sender and a receiver (or audience)
medium
4
path that connects the sender and receiver for transmission of information over a network.
communication channel
5
is a group of computers linked to each other that enables the computers to communicate with each other and share their resources, data, and applications.
computer network
6
(wired or bounded media) Data signals are enclosed in a cabling media.
guided media
7
examples of guided media
twisted pair, coxial, fiber optics
8
A guided media that have characteristic of;
Speed: 10 mbps to 10 gbps
-Most popular
Used in LAN and Local Telephone Lines
Disadvantages
• Unsuitable for long distance
Characteristics
• Can carry voice and data signals • Copper wires pair are insulated by plastic
•Wires are twisted together in order to reduce noise It is of two types, Unshielded Twisted Pair(UTP) and Shielded Twisted Pair (STP). Inexpensive and easy to install and
twisted pair
9
A guided media that have characteristic of;
Speed: 10 mbps to 100 mbps
for long-distance telephone lines and LANS Single solid copper wire core that is covered by insulating material.
Characteristics
It is used for video transmissions for televisions or
Copper mesh is used to cover the insulated copper wire to protect from electromagnetic waves. Carries both analog and digital signals.
Carries high-frequency range signals It is of two types, thicknet and thinnet.
Disadvantages
Expensive than twisted pair Not compatible with twisted pair cable
coaxial cable
10
a guided media that have characteristic of;
Speed: 100 gbps+ Characteristics
Used for Internet or long distance communication Digital signals are sent as light puises which are
translated back into electrical signals • Fine glass strand surrounded by glass cladding and protective layer
single strand Secure and has very low signal loss.
Disadvantages
Expensive, difficult to install and modify. Difficult to repair
fiber optics
11
Electromagnetic waves of different frequencies are used
unguided media
12
5 examples of unguided media
microwave, radio wave, cellular, infrared, satellite
13
A unguided that have characteristic of;
Speed: 1 mbps to 10 gbps
Characteristics
Used for high speed transmission Information is sent via microwaves from ground based transmitting and receiving stations Text, sound, and graphics are converted into microwave pulses and transmitted Microwave stations (a.k.a. repeater stations) must be placed every 50 kilometres to receive, amplify, and then pass the signal along
Disadvantages
It cannot pass thru obstacles
Can only use line of sight transmission. • It also supports limited bandwidth
microwave
14
a an guided media that have characteristic of;
Speed: 1 mbps to 10 mbps
Characteristics
Used for cordless phones, AM & FM radio transmission for both voice and data. Can travel long distances and penetrates buildings
Requires a transmitter to send broadcast radio signals and a receiver to receive it The receivers uses an antenna to receive the signals
An example of the short-range broadcast radio is Bluetooth,
-Used in computers, mobiles, printers etc. -Transmit data at a rate of 1Mbps
Disadvantages
Unidirectional and insecure Interference such as reflections from water
radiowave
15
a unguided media that have characteristic of;
Speed: 10 mbps to 1 gbps
Characteristics
Used in wireless modems and cellular telephone Uses high-frequency radio waves to transmit
voice and digital data
• Can connect notebooks or mobile computers to the celluar telephone to access the Web or send and receive the email, etc Personal Communications Services (PCS) is a set of technologies used for digital cellular devices like Laptops, cellular telephones, etc.
Disadvantages
It requires complex infrastructure • Well planned frequency spectrum distribution
cellular radio
16
an unguided media that have characteristic of;
Speed: 1 gbps
Characteristics
• Used in remote controls for televisions, optical mouse and entertainment devices
• Sends signals using infrared light wave that is invisible to us and is just above the red end
of the colour spectrum. • It Works over a moderate bandwidth 115 kbps and works upto few meters.
• IRDA port is fixed to transfer data • Alternative to short-range range channel like Bluetooth.
Disadvantages It has short range and low bandwidth
• It requires a light of sight transmission.
infrared
17
a unguided media that have a characteristic of;
Speed: 1 mbps to 10 gbps
Characteristics
uplink
downlink
Disadvantages
Is used for global communication, Satellites are placed in space and they orbit the earth. Receives microwave signals from the earth station
Satellites magnify the signals and retransmit them back The data transfer speed is very high It avoids the cost of cabling and repeater stations The transmission from the earth station to a satellite is called uplink. The transmission from the satellite to the earth station is called the downlink.
it is expensive and not easy to repair and maintain Weather and sunspots cause signal disturbance
satellite
18
• The communication system in which there exists no wire or physical medium between transmitter and receiver.
• Examples are mobile phones, radio, bluetooth, Wi-Fi
wireless communication system
19
• The communication system in which we use cables, wires, or any physical media to transfer data or information using electrical or optical signals.
• Examples are telegraphs and telephones
wired communication system
20
thypes of communication channel
simplex, semi-duplex, full-duplex
21
it allows the sending of information in one direction only, which is similar to a one-way street. Examples: garage door opener, car key fob, wireless microphone, radio, tv
simplex
22
it is information can be sent in both directions, but it doesn't allow both directions to operate at the same time. Example: walkie- talkie
semi-duplex
23
its information can be carried in both directions at the same time. The 2 directions of information travel are Independent of each other. Examples: ordinary/mobile phone systems, telephone calls
full-duplex