what r the different types of communication channel....pls explain  

A Channel can take many forms. Examples of communications channels include:

1. A connection between initiating and terminating nodes of a circuit.
2. A buffer from which messages can be put and gotten. See Actor model and process calculi for discussion on the use of channels.
3. A single path provided by a transmission medium via either
* physical separation, such as by multipair cable or
* electrical separation, such as by frequency- or time-division multiplexing.
4. A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.
5. The portion of a storage medium, such as a track or a band, that is accessible to a given reading or writing station or head.
6. In a communications system, the part that connects a data source to a data sink.
7. A specific radio frequency, pair or band of frequencies, usually named with a letter, number, or codeword, and often allocated by international agreement.
Examples:
* Marine VHF radio uses some 88 channels in the VHF band for two-way FM voice communication. Channel 16, for example, is 156.800MHz. Seven additional channels, WX1 - WX7, are allocated for weather broadcasts.
* Television channels such as North American TV Channel 2 = 55.25MHz, Channel 13 = 211.25MHz. Each channel is 6MHz wide. Besides these "physical channels", television also has "virtual channels".
* Wi-Fi consists of unlicensed channels 1-13 from 2412MHz to 2484MHz in 5MHz steps.
8. A room in the Internet Relay Chat (IRC) network, in which participants can communicate with each other.

Answered by Yash at 2:00 PM on July 04, 2008

There are two types of communication channels:
-Simplex communication
-Duplex communication

Simplex communication is a name for a type of communication circuit. There are two (contradictory) definitions that have been used for the term. When one definition is used for "simplex" then the other definition is referred to as half duplex. a simplex circuit is one where all signals can flow in only one direction at a time.

Examples: Wireless communication in forces, Radio, televison

A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. (The term duplex is not used when describing communication between more than two parties or devices.)

Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way street" between two connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.
A full-duplex, or sometimes double-duplex system allows communication in both directions, and unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex since they allow both callers to speak and be heard at the same time. A good analogy for a full-duplex system would be a two-lane road with one lane for each direction.

Answered by Raksha at 9:58 PM on June 19, 2008

the types are wiire - Cheap, simple, compatable with old equipment, must be amplified for long distances
Optical - Fast, long distance, high bandwidth, can carry multiple data streams on one cable, expensive, can break easily
Wireless RF - Simple, no cables, expandable, no line-of-sight required, long distance
Wireless IR - Cheap, line-of-sight required
That's all folks! I honestly don't think there are any other network medias. Unless you split wire into coax (thick copper), UTP (Unshielded Twisted Pair), STP (Shielded Twisted Pair), etc. But I may be wrong.
-DJ Craig


Big bandwidth, slow response
Let's think "outside the box" for a moment:

Nobody ever said this question was about "data" communication between digital devices. There are many other well-known media for information communication, including air and other fluids, using numerous different signalling means:


Don't forget the "communication channel" of physical delivery of pre-recorded media! It is often MUCH cheaper and efficient to send a taxi full of CDROMS across town (or mail it some arbitrary distance) than to create a point-to-point microwave highway or complicated digital network to deliver the same data, if you don't care when it gets there. Plus, you have the advantage of keeping your expensive digital bandwidth available for time-sensitive data. This is Information Theory 101.

Also, where does satellite fit in? It would be wireless RF (microwave), line of sight, thousands of miles up and back.


Let's not forget "audio" media for communication, sonic and ultra-sonic, as well as
"visible" using air or fluids (not fibers) as medium (blinking light, flags, etc),
pressure signals are often used in hydraulic or pneumatic systems;
mechanical signals are used for communication of status or RPM information;
thermal signals can communicate information through various media (although not always quickly);
paper is a medium often used for communication, such as things we used to call "books" or "newspapers".
this is taken from source http://wiki.answers.com/Q/2._L ist_s ix_types_of_communication_medi a_and _give_examples_of_situation_wh ere_a nd_why

Answered by Madhurima at 1:53 PM on June 17, 2008

hi kumar the types are wiire - Cheap, simple, compatable with old equipment, must be amplified for long distances
Optical - Fast, long distance, high bandwidth, can carry multiple data streams on one cable, expensive, can break easily
Wireless RF - Simple, no cables, expandable, no line-of-sight required, long distance
Wireless IR - Cheap, line-of-sight required
That's all folks! I honestly don't think there are any other network medias. Unless you split wire into coax (thick copper), UTP (Unshielded Twisted Pair), STP (Shielded Twisted Pair), etc. But I may be wrong.
-DJ Craig


Big bandwidth, slow response
Let's think "outside the box" for a moment:

Nobody ever said this question was about "data" communication between digital devices. There are many other well-known media for information communication, including air and other fluids, using numerous different signalling means:


Don't forget the "communication channel" of physical delivery of pre-recorded media! It is often MUCH cheaper and efficient to send a taxi full of CDROMS across town (or mail it some arbitrary distance) than to create a point-to-point microwave highway or complicated digital network to deliver the same data, if you don't care when it gets there. Plus, you have the advantage of keeping your expensive digital bandwidth available for time-sensitive data. This is Information Theory 101.

Also, where does satellite fit in? It would be wireless RF (microwave), line of sight, thousands of miles up and back.


Let's not forget "audio" media for communication, sonic and ultra-sonic, as well as
"visible" using air or fluids (not fibers) as medium (blinking light, flags, etc),
pressure signals are often used in hydraulic or pneumatic systems;
mechanical signals are used for communication of status or RPM information;
thermal signals can communicate information through various media (although not always quickly);
paper is a medium often used for communication, such as things we used to call "books" or "newspapers".
this is taken from source http://wiki.answers.com/Q/2._List_s ix_types_of_communication_media_and _give_examples_of_situation_where_a nd_why

Answered by laks at 4:22 PM on June 16, 2008

hi there

A Channel can take many forms. Examples of communications channels include:

1. A connection between initiating and terminating nodes of a circuit.
2. A buffer from which messages can be put and gotten. See Actor model and process calculi for discussion on the use of channels.
3. A single path provided by a transmission medium via either
* physical separation, such as by multipair cable or
* electrical separation, such as by frequency- or time-division multiplexing.
4. A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.
5. The portion of a storage medium, such as a track or a band, that is accessible to a given reading or writing station or head.
6. In a communications system, the part that connects a data source to a data sink.
7. A specific radio frequency, pair or band of frequencies, usually named with a letter, number, or codeword, and often allocated by international agreement.
Examples:
* Marine VHF radio uses some 88 channels in the VHF band for two-way FM voice communication. Channel 16, for example, is 156.800MHz. Seven additional channels, WX1 - WX7, are allocated for weather broadcasts.
* Television channels such as North American TV Channel 2 = 55.25MHz, Channel 13 = 211.25MHz. Each channel is 6MHz wide. Besides these "physical channels", television also has "virtual channels".
* Wi-Fi consists of unlicensed channels 1-13 from 2412MHz to 2484MHz in 5MHz steps.
8. A room in the Internet Relay Chat (IRC) network, in which participants can communicate with each other.

All of these communications channels share the property that they transfer information. The information is carried through the channel by a signal.

Types of communications channels

* Simplex communication
* Duplex communication
Simplex communication:
Simplex communication is a name for a type of communication circuit. There are two (contradictory) definitions that have been used for the term. When one definition is used for "simplex" then the other definition is referred to as half duplex.

Duplex communication:
A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. (The term duplex is not used when describing communication between more than two parties or devices.

Answered by Reeta K at 6:08 PM on June 13, 2008

There are two types of communication channels:
-Simplex communication
-Duplex communication

Simplex communication is a name for a type of communication circuit. There are two (contradictory) definitions that have been used for the term. When one definition is used for "simplex" then the other definition is referred to as half duplex. a simplex circuit is one where all signals can flow in only one direction at a time.

Examples: Wireless communication in forces, Radio, televison

A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. (The term duplex is not used when describing communication between more than two parties or devices.)

Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way street" between two connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.
A full-duplex, or sometimes double-duplex system allows communication in both directions, and unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex since they allow both callers to speak and be heard at the same time. A good analogy for a full-duplex system would be a two-lane road with one lane for each direction.

Answered by Arti singh at 5:15 AM on June 13, 2008

There are two types of communication channels:
-Simplex communication
-Duplex communication

Simplex communication is a name for a type of communication circuit. There are two (contradictory) definitions that have been used for the term. When one definition is used for "simplex" then the other definition is referred to as half duplex. a simplex circuit is one where all signals can flow in only one direction at a time.

Examples: Wireless communication in forces, Radio, televison

A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. (The term duplex is not used when describing communication between more than two parties or devices.)

Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way street" between two connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.
A full-duplex, or sometimes double-duplex system allows communication in both directions, and unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex since they allow both callers to speak and be heard at the same time. A good analogy for a full-duplex system would be a two-lane road with one lane for each direction.

Answered by Ashish Yadav at 7:59 PM on June 12, 2008

well DINESH, Electrical communications channels are either
wireline or wireless channels.
Wireline channels physically connect transmitter to receiver
with a "wire" which could be a twisted pair, coaxial cable or
optic fiber. Consequently, wireline channels are more private
and much less prone to interference. Simple wireline channels
connect a single transmitter to a single receiver: a
point-to-point connection as with the telephone.
Listening in on a conversation requires that the wire be tapped
and the voltage measured. Some wireline channels operate in
broadcast modes: one or more transmitter is
connected to several receivers. One simple example of this
situation is cable television. Computer networks can be found
that operate in point-to-point or in broadcast modes. Wireless
channels are much more public, with a transmitter's antenna
radiating a signal that can be received by any antenna
sufficiently close enough. In contrast to wireline channels
where the receiver takes in only the transmitter's signal, the
receiver's antenna will react to electromagnetic radiation
coming from any source. This feature has two faces: The smiley
face says that a receiver can take in transmissions from any
source, letting receiver electronics select wanted signals and
disregarding others, thereby allowing portable transmission and
reception, while the frowny face says that interference and
noise are much more prevalent than in wireline situations. A
noisier channel subject to interference compromises the
flexibility of wireless communication.

Answered by Romi at 6:21 PM on June 12, 2008

well
A Channel can take many forms. Examples of communications channels include:

1. A connection between initiating and terminating nodes of a circuit.
2. A buffer from which messages can be put and gotten. See Actor model and process calculi for discussion on the use of channels.
3. A single path provided by a transmission medium via either
* physical separation, such as by multipair cable or
* electrical separation, such as by frequency- or time-division multiplexing.
4. A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.
5. The portion of a storage medium, such as a track or a band, that is accessible to a given reading or writing station or head.
6. In a communications system, the part that connects a data source to a data sink.
7. A specific radio frequency, pair or band of frequencies, usually named with a letter, number, or codeword, and often allocated by international agreement.
Examples:
* Marine VHF radio uses some 88 channels in the VHF band for two-way FM voice communication. Channel 16, for example, is 156.800MHz. Seven additional channels, WX1 - WX7, are allocated for weather broadcasts.
* Television channels such as North American TV Channel 2 = 55.25MHz, Channel 13 = 211.25MHz. Each channel is 6MHz wide. Besides these "physical channels", television also has "virtual channels".
* Wi-Fi consists of unlicensed channels 1-13 from 2412MHz to 2484MHz in 5MHz steps.
8. A room in the Internet Relay Chat (IRC) network, in which participants can communicate with each other.

All of these communications channels share the property that they transfer information. The information is carried through the channel by a signal.

Types of communications channels

* Simplex communication
* Duplex communication
Simplex communication:
Simplex communication is a name for a type of communication circuit. There are two (contradictory) definitions that have been used for the term. When one definition is used for "simplex" then the other definition is referred to as half duplex.

Duplex communication:
A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. (The term duplex is not used when describing communication between more than two parties or devices.)

Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way street" between two connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.

Answered by jaivir at 6:13 PM on June 12, 2008

communications channels are -\

Simplex communication

Duplex communication

and also Electrical communications channels are either wireline or wireless channels. Wireline channels physically connect transmitter to receiver with a "wire" which could be a twisted pair, coaxial cable or optic fiber. Consequently, wireline channels are more private and much less prone to interference. Simple wireline channels connect a single transmitter to a single receiver: a point-to-point connection as with the telephone. Listening in on a conversation requires that the wire be tapped and the voltage measured. Some wireline channels operate in broadcast modes: one or more transmitter is connected to several receivers. One simple example of this situation is cable television. Computer networks can be found that operate in point-to-point or in broadcast modes. Wireless channels are much more public, with a transmitter's antenna radiating a signal that can be received by any antenna sufficiently close enough. In contrast to wireline channels where the receiver takes in only the transmitter's signal, the receiver's antenna will react to electromagnetic radiation coming from any source. This feature has two faces: The smiley face says that a receiver can take in transmissions from any source, letting receiver electronics select wanted signals and disregarding others, thereby allowing portable transmission and reception, while the frowny face says that interference and noise are much more prevalent than in wireline situations. A noisier channel subject to interference compromises the flexibility of wireless communication. for more inf check source http://cnx.org/content/m0099/l atest /

Answered by Sharad Singh at 6:02 PM on June 12, 2008