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A path through which information is transmitted from spot to this band are brilliant called communication channel. It can also be called communication medium or link. The twisted pair wire, coaxial cable, fiber optic cable, microwave, satellite etc. are examples of communication channels.

In a communication channel, data is transmitted available as signals (analog signal). The data transmission is measured in bandwidth. The bandwidth will be higher if more signals could be transmitted. Actually, the bandwidth measures how much information that might be transmitted through the media inside given period of time. For analog signals, bandwidth is represented in hertz (Hz). It means quantity of signals transmitted per second. For digital signals, it is represented in bits per second (bps). Different transmission media have different bandwidths. The higher the bandwidth from the transmission media, greater information might be transmitted.

Types of Communication Channel:

The communication channel or media is divided into two sorts.

In guided communication media, communication products are directly associated with the other person via cables or physical media for transmission of information. The data signals are bounded to some cabling media. Therefore, guided media is also called bounded media. The guided media usually are employed in LAN. The samples of guided or bounded media are:

Twisted Pair Cable: Twisted pair cable is one from the most often used communication media.

It is used in local area network (LAN) for data communication between different computers. It can be found in telephone lines to handle voice and data signals.

A twisted pair cable consists of a set of two thin diameter copper wires. These wires are covered by heat retaining material (such as plastic). These pair of wires are twisted together to create a cable. The wires are twisted around the other person to lower (or reduce) interference off their twisted pairs inside the cable. What is the best click here is probably the best around.

The data transmission speed through twisted pair cable is around 9600 bits per second in a very distance of 100 meters. However, this transmission speed is under coaxial cable or optical fiber.

The twisted pair cable continues to be the standard communication channel for voice and data communication. But now its use is reducing because today more reliable communication media can be obtained such as coaxial cable, fiber optic cable microwave and satellite.

Coaxial Cable: Coaxial cable can also be called Coax. It carries signals of upper frequency ranges than twisted-pair cable. Coaxial cable consists of a single solid copper wire, which is sometimes called the inner conductor.

Coaxial cable could be used for telephone lines for voice and data transmission with extremely high frequency. The bandwidth of coaxial cable is 80 times higher than that of twisted pair media. Coaxial cable is also widely employed in local area network (LAN). It is more expensive than twisted-pair wire.

Fiber-Optic Cable: In twisted-pair cable and coaxial cable, information is transmitted available as electric frequencies. The fiber optic cable uses light to deliver data. The data transmission speed is high (because fiber-optic cable uses light for you data). The data transmission speed is about billions bits per second. Today, most in the telephone companies and cable TV operators are employing fiber optic cables within their networks.

A fiber optic cable is made up of tubes of glass (or thin glass fibers) through which information is transmitted as pulses of light. A typical optical fiber has a very narrow strand or fiber of glass called the core. It is thinner when compared to a real human hair. The core is encompassed by a concentric layer of glass called Cladding. The diameter of an core is 62.5 microns (I micron = 10-6 meters). The diameter of cladding is around 125 microns. The cladding is coated with padding for example plastic, called the Jacket.

2. Unguided Media:

In unguided communication media, info is communicated between communication devices available as wave. Unguided media provides means to deliver data signals but does not guide them along a certain path. The data signals usually are not bounded to your cabling media. Therefore,. unguided media is additionally called unbounded media.

This transmission medium can be used when it is impossible to install the cables. The data could be transmitted around the globe through this medium. The types of unguided or unbounded media are:

Microwaves: In microwave transmission, information is transmitted through air or space, as an alternative to through cables or wires. Microwaves are high frequency radio waves. These waves are only able to travel in straight lines.

The data is transmitted and received via a microwave station. A microwave station is also called relay station or booster. A microwave station contains an antenna, transmitter, receiver, and other equipments that are necessary for microwave transmission. Microwave antennas they fit on the high towers or buildings which they fit within 20 to 30 miles of one another. There may be many microwave stations between your sender and receiver. Data is transmitted in one microwave station to a new. Each microwave station receives signals from previous microwave station and transmits to next station. In this way, data is transmitted over larger distances.

The data transmission speed of microwave transmission is about 150 Mbps. Microwave transmission is found in environments where installing physical transmission media doesn’t seem possible and where line-of-sight transmission is accessible, it really is employed in wide-open areas. Today, it really is used by telephone companies, cable television providers, universities etc.

Satellite Communication: A communication satellite is really a space station. It receives microwave signals (or messages) from earth stations. Satellite transmission station that can send and receive messages is known as earth station. The earth based stations often are microwave stations. Other devices, for example PDAs and GPS receivers, also functions as earth based stations.

Satellites rotate approximately 22,300 miles above the earth in precise locations. The communication satellite is made up of solar powered, transceiver that receives and sends signals. The signals are transmitted in one earth station towards the satellite. The satellite receives and amplifies the signals and sends them to a new earth station. This entire process takes just a few seconds. In this way, data or messages are transferred derived from one of location to an alternative. Transmitting a signal from ground or earth station to some satellite station in space is termed up-linking and the reverse is called the down-linking. The data transmission speed of communication satellite is quite high like upto 1 Gbps.

Different communication satellites are used to handle kinds of information such as calls, television transmissions, military communication, weather data, and in many cases radio stations use them commercially broadcasting. The global positioning systems and Internet also employ the communication satellites.

Radio Broadcast: It is a wireless transmission medium that is utilized to communicate information through radio signals in air, over international calls including between cities and countries.

In this medium, a transmitter is required to send messages (signals) and receiver is needed to receive them. To receive radio stations signal, the receiver has an antenna that is located inside range of signal. Some networks use a special device called transceiver accustomed to send and also to receive messages as radio signals. The data transmission speed of radio broadcast is perfectly up to 54 Mbps.

Cellular Radio: Cellular radio is often a form of radio broadcast that is used for mobile communications including cellular telephones and wireless modems. A cellular, telephone is often a telephone device which utilizes high frequency radio waves for you voice and digital messages. Some mobile users connect their laptop computer and other mobile devices with a cellular telephone to gain access to the Web, send and receive e-mail etc. while far from a regular line.


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