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Elastic and Inelastic Traffic

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Services in Your Area
Bo Sun

CIS 505: Communication Technologies
Strayer University

Darcel Ford, Ph.D.
February 26, 2013

DSL and Cable Modem Services Region
DSL could only cover a limited area without a repeater. Therefore, it always to be used as a local loop WAN link. According to Dean (2009), “DSL uses advanced data modulation techniques to achieve extraordinary throughput over regular telephone lines.” (Dean, 2009) There are variety types of DSL and the types could be divided as asymmetrical and symmetrical. ADSL is the most common type of DSL that connect home network to the Internet through telecommunications switches. The DSL connection needs a DSL model to alternate signals between the telephone line and the computer.

DSL makes use of the existing telephone infrastructure as the dial-up access. However, it applies the technique of frequency-division multiplexing which decides the channel into 3 separate links. Therefore, DSL could provide higher transmission rate and guarantee the users to talk on the phone simultaneously.

Broadband or cable Internet access is another prevalent residential access method. A residence obtains cable Internet access from the same company that supports it cable television. As with DSL, cable access is asymmetric, with the downstream channel possesses a higher transmission rate. The difference is that cable Internet access is a shared broadcast medium. Therefore, if there are several users utilize the downstream channel simultaneously, the actual transmission rate is lower.

Dean mentioned: “cable broadband access continues to service the majority of residential customers, whereas DSL is more popular among business customers.” (Dean, 2009)
Diagram
[pic]
[pic]
Speeds of DSL and Cable
Theoretically, the speed of cable could be approximately 30 Mbps. On the other hand, DSL supports maximum 9Mbps downstream (receiving data) and 640 Kbps upstream (sending data).
However, the real capability gap between cable and DSL is not so mush. This is because cable will be shared with many customers and ISPs would set speed-cap to limit their services. (Mitchell)

Cost of DSL and Cable
| |DSL |cable |
|Install fee |150 |50-100 |
|Average per month |5-10 |40-50 |

Reliability of DSL and Cable
Both DSL and cable could support high level reliability of Internet access. The reliability of DSL and cable is enough for home use network compare with the traditional dial-up access. However, from business perspective, the speed might not be adequate. T1 and T3 might be optical option. (Beal, 2010) Nowadays, there is variety of Internet access options. Faber optic and WiMax both provide much greater performance.
Recommend
From the former comparison, I would select cable as my Internet access. Currently, the capability of DSL is not enough. The service providers always support several services simultaneously which may include telephone, TV and Internet access. And the throughput of these services is much higher than DSL or cable.

References
Beal, V. (2010). Cable vs. DSL. Retrieved from http://www.webopedia.com/DidYouKnow/Internet/2005/cable_vs_dsl.asp
Dean, T. (2009). network+ guide to networks. Mason: Cengage Learning.
Mitchell, B. (n.d.). DSL vs Cable - Broadband Internet Speed Comparison. Retrieved from About.com: http://compnetworking.about.com/od/dslvscablemodem/a/speedcompare.htm

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