Multiplexing – Сustom Literature essay

Sample essay topic, essay writing: Multiplexing - 491 words

Every computer has a port to connect a communication line or cable from a peripheral device. Computers have limited number of ports, so multiplexers are used. They combine signals from multiple terminals and put them all on a single communications line. This increases the efficiency of communication and is cost-effective. The communication line is divided into different sections and the data from each terminal is coded and sent and then received, decoded and directed to the correct section from where it came from. There are four commonly used types of multiplexing, the first is (FDM) frequency division multiplexing.

FDM divides the bandwidth of the communication line so that each terminal can transmit data. The individual terminals are separated from guardbands to ensure the signals do not interfere with each other. Multiplexers often have external modems or internal modems built in to convert the data to analog before transmission takes place. The local cable television companies use FDM to send multiple stations over the same line at once. Another method for combining data on a transmission line is time division multiplexing, instead of dividing frequencies to transmit signals, TDM divides the transmission line into time segments

Each terminal is assigned a fixed time slot on a rotation. When the terminals time slot appears it receives the full transmissions capacity for that line. TDM is like packet switching except the time slots are pre-allocated. Instead of using gaurdbands to separate signals TDM uses guard times. If a terminal has no data to transmit at its specific time, the line remains idle. In TDM terminals rarely transmit continuous data which means some sections of the line are almost always idle.

In STDM (statistical time division multiplexing) the same concepts apply except if the terminal doesn't have any information to share it's time slot will not be created and will move on to the next available terminal, producing less down time. STDM is driven by data, they also perform more operations than TDM. They provide buffers, and can compress data and report statistics, support digital data, and modem capabilities. The first wavelength division multiplexing system combined two signals and was created 1985, modern systems can handle 160 signals. Telecommunications companies like this technique because they can easily upgrade there lines without having to overhaul the network backbone.

It uses same idea of FDM but with fiber-optic cables. The line assigns each signal a particular wavelength. Early WDM systems were expensive and complicated to run, recent advancements in technology has made them affordable and more user-friendly. There are two types of cables in the market, DWDM is the dense cables run 8 or more active wavelengths per fiber. Systems with less than 8 wavelengths are known as coarse WDM devices. Multiplexers can be intergraded into networks in many different ways, the number of lines available depends on the type of system being hooked up.

The benefits of a multiplexer are being able to carry multiple signals on a communication line.

Research paper and essay writing, free essay topics, sample works Multiplexing

Please do not pass this sample essay as your own, otherwise you will be accused of plagiarism. Our writers can write any custom essay for you!
  • Compression – Сustom Literature essay
  • Sample essay topic, essay writing: Compression - 453 words Due to compression, TV audio and video require less bandwidth and multiple digital TV channels can fit unto one satellite transponder as oppose to a single analogue channel occupying the whole transmission line. A TV signal is captured by a camera and then manipulated during program production.
  • Wireless Networking – Сustom Literature essay
  • Sample essay topic, essay writing: Wireless Networking - 1242 words There are many reasons why wireless networks are used. One reason is for a temporary backup to an existing broken cable network. Cable networks can leave many users disconnected from the network by one bad or broken cable. When this happens a wireless network may help
  • Wireless Protocols
  • Sample essay topic, essay writing: Wireless Protocols - 1051 words Wireless ProtocolsJason D. KnightAs with all data transmission technologies, protocols govern the manner in which information is transferred between stations. A protocol is simply an agreed upon standard that all parties use to ensure that different devices can communicate with each other. Wireless protocols can be
  • An Introduction to Fiber Optics Technology
  • Throughout time, speed and efficiency in the telecommunications industry has progressed at a rapid pace due to fiber optic technology. In 1979, AT&T revolutionized the telecommunications industry by producing a medium for data transmission which used light, called fiber optic cable. This medium created a bandwidth of 44.736 Mbps and could multiplex 672 trunk circuits
  • Network 2
  • Sample essay topic, essay writing: Network 2 - 448 words A computer network is a group of interconnected computers that can accomplish many important tasks. To define computer networking you should define networks. A network is composed of two or people or objects, using a common language, and they have something to share. In computer networking
30 May 2014. Author: Criticism