CIS 505 Week 9 Discussions STR
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defines what combinations of ones and zeros constitute all the characters in a character set (that is,<br />
lowercase letters, uppercase letters, punctuation marks, digits, keyboard control functions).<br />
References<br />
http://www.informit.com/articles/article.aspx?p=24687&seqNum=5<br />
Digital transmission has several advantages over analog transmission. Analog circuits require<br />
amplifiers, and each amplifier adds distortion and noise to the signal. In contrast, digital amplifiers<br />
regenerate an exact signal, eliminating cumulative errors. An incoming (analog) signal is sampled,<br />
its value is determined, and the node then generates a new signal from the bit value; the incoming<br />
signal is discarded. With analog circuits, intermediate nodes amplify the incoming signal, noise and<br />
all. Voice, data, video, etc. can all by carried by digital circuits.<br />
References:<br />
http://web.cs.wpi.edu/~cs513/s07/week2-physcont.pdf<br />
<strong>CIS</strong> <strong>505</strong> <strong>Week</strong> 9 Discussion 2<br />
T-1 Lines. Please respond to the following:<br />
From the e-Activity, analyze the multiplexing techniques of DSL and cable modem Internet<br />
and suggest the one you prefer. Explain your decision.<br />
Multiplexing takes multiple signals and merges them into one, complex signal to be<br />
transmitted. Once the receiving devices catches the multiplexed signal, it is then divided into it’s<br />
original, multiple form. Cable modems use a new specification, named DOCSIS 3.1, to remain<br />
competitive and add multiple enhances. One of these enhancements is Orthogonal Frequency<br />
Division Multiplexing (OFDM). This transmission technique divides bandwidth into smaller subcarriers<br />
which helps decrease interference and allow for better data transmission on parallel<br />
channels. This standard provides the ability to define multiple downstream profiles on a single<br />
channel. The DOCSIS 3.1 specification also uses time and frequency multiplexing to transmit<br />
signals through a single channel. This makes OFDM and other legacy channels to operate<br />
simultaneously on separate or on the same frequencies.<br />
Compare and contrast the use of leased lines in a WAN or LAN setting. Then recommend<br />
what you would use if you were a CIO. Support your response with evidence or examples.
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