Compare the data communication technologies

Compare the data communication technologies

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Compare the data communication technologies

Digital Transmission. Please respond to the following:

Compare the data communication technologies of guided media and unguided media. This should include transmission media, data link control protocols, and multiplexing.

Guided media is a physical path in which the signals prorogate; twisted pair, coaxial cable, and fiber optic. Unguided media usually employs an antenna for transmitting via air, vacuum, or water. Thus, the reason unguided transmission techniques are usually used for broadcast radio, terrestrial microwave, and satellite. Network environments are very costly due to the efforts need to protect transmission. High Level Data Link Control (HDLC) is a group of protocols or rules for transmitting data between network points. It’s one of the most used of many protocols. Data Link controls helps with the flow and error control of the transmission. Multiplexing aides in achieving transmission efficiency.

Compare the data communication technologies

An analog wave form (or signal) is characterized by being continuously variable along amplitude and frequency. In the case of telephony, for instance, when you speak into a handset, there are changes in the air pressure around your mouth. Those changes in air pressure fall onto the handset, where they are amplified and then converted into current, or voltage fluctuations. Those fluctuations in current are an analog of the actual voice pattern—hence the use of the term analog to describe these signals. Digital transmission is quite different from analog transmission. For one thing, the signal is much simpler. Rather than being a continuously variable wave form, it is a series of discrete pulses, representing one bits and zero bits. Each computer uses a coding scheme that defines what combinations of ones and zeros constitute all the characters in a character set (that is, lowercase letters, uppercase letters, punctuation marks, digits, keyboard control functions).

References

http://www.informit.com/articles/article.aspx?p=24687&seqNum=5

Digital transmission has several advantages over analog transmission. Analog circuits require amplifiers, and each amplifier adds distortion and noise to the signal. In contrast, digital amplifiers regenerate an exact signal, eliminating cumulative errors. An incoming (analog) signal is sampled, its value is determined, and the node then generates a new signal from the bit value; the incoming signal is discarded. With analog circuits, intermediate nodes amplify the incoming signal, noise and all. Voice, data, video, etc. can all by carried by digital circuits.

References:

http://web.cs.wpi.edu/~cs513/s07/week2-physcont.pdf
CIS 505 Week 9 Discussion 2

T-1 Lines. Please respond to the following:

From the e-Activity, analyze the multiplexing techniques of DSL and cable modem Internet and suggest the one you prefer. Explain your decision.

Multiplexing takes multiple signals and merges them into one, complex signal to be transmitted. Once the receiving devices catches the multiplexed signal, it is then divided into it’s original, multiple form. Cable modems use a new specification, named DOCSIS 3.1, to remain competitive and add multiple enhances. One of these enhancements is Orthogonal Frequency Division Multiplexing (OFDM). This transmission technique divides bandwidth into smaller sub-carriers which helps decrease interference and allow for better data transmission on parallel channels. This standard provides the ability to define multiple downstream profiles on a single channel. The DOCSIS 3.1 specification also uses time and frequency multiplexing to transmit signals through a single channel. This makes OFDM and other legacy channels to operate simultaneously on separate or on the same frequencies.

Compare and contrast the use of leased lines in a WAN or LAN setting. Then recommend what you would use if you were a CIO. Support your response with evidence or examples.

WANs are often built using leased lines. These leased lines involve a direct point-to-point connection between two sites. Point-to-point WAN service may involve either analog dial-up lines or dedicated leased digital private lines. An analog signal is a continuously varying electromagnetic wave that may be transmitted over a variety of media, depending on frequency. The principal advantages of digital signaling are that it is generally cheaper than analog signaling and is less susceptible to noise interference. Therefore, my recommendation would be in support of leasing lines in a WAN setting. A wide area network allows companies to make use of common resources in order to operate. Internal functions such as sales, production and development, marketing, and accounting can also be shared with authorized locations through this sort of network. The wide area network has made it possible for companies to communicate internally in ways never before possible.