CIS 505 Week 9 Discussions STR
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CIS 505 Week 9 Discussions STR
CIS 505 Week 9 Discussion 1
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.
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
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.
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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.
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