Time for a Mini-Case Cathy\'s Collectibles Your cousin Cathy runs a part-time bu

Question

Time for a Mini-Case Cathy's Collectibles Your cousin Cathy runs a part-time business out of her apartment. She buys and sells collectibles such as antique prints, baseball cards, and cartoon cells and has recently discovered the Web with its many auction sites. She has begun buying and selling on the Web by bidding on collectibles at lesser-known sites and selling them at a profit at more well-known sites. She downloads and uploads lots of graphics (pictures of the items she's buying and selling). She asks you for advice. Figure 10-8 (Links to an external site.)Links to an external site. shows some of the available Internet services and their prices. Explain the differences in these services and make a recommendation.

https://jigsaw.vitalsource.com/books/9781119127857/epub/OPS/c10.xhtml?create=true#c10-fig-0008

Explanation / Answer

The digital subscriber line (DSL) is family of point-to-point technologies designed to provide high-speed data tansmission over traditional telephone lines. The reason for the limited capacity on traditional telephones circuit lies with the telephones and the switching equipment at the end offices. There are many different types of DSL. The

most common type of DSL in use today is assymetric DSL (ADSL). ADSL is called asymmetric because its two

data channel have different speed. The size of the two digital channels depends on the ditance from the CPE tp the end office. The shorter the distance, the higher the speed, because with a shorter a distance, he circuit suffers less attenuation and higher-frequency signals can be used, providing a greater bandwisth for modulation. The ADSL package has maximum speed of 1.5 Mbps downstream rate and 384 Kbps upstream rate with maximum legth of 18,000 feet for local loop.

Cable modem architecture is very similat to DSL- with one very important difference. DSL is point-to-point technology whereas the cable modems use shared multipoints circuits. With cable modems, each user must compete with other users for the availble capacity. Furthermore, because the cable circuit is multipoint circuit, all

messages on the circuit goes to all computers on the circuit. The DOCSIS stadards provides many types of cable

modems. the maaximum speed is about 150Mbps downstream rate and about 100Mbps upstream rate, although most cable TV companies provide at most 27 Mbps downstream and 10 Mbps upstream. Cable modem can be cofigured to limit capacity, so the most common speed offered by most cable providers range from 1-10Mbps

downstream and 256 Kbps to 1Mbps upstream. Of coure, this capacity is shared, so an individual user will only see this when no other computers on his or her segment are active.

the most popular types of fixed wireless are WiMAx and wireless DSL, which requires a line of sight between the

communicating transmitters. for this reason, wireless DSL has limited application because it requires tall buildings

or towers to be effective. Fixed wireless comes in both point-to-point and multipoint versions, the point-to-point

version is designed to connect only two location and is often used as backbone between buildings owned by the

same organization The multipoint version is sometimes called point-to-multipoint because there is one central

receiver and all other locations communincate only with it. the multipoint version is designed as an alternative to

DSL and cable modem and is intended for use by an ISP supporting a small number of customers. Like cable

modems, the circuit is a shared circuit, so user must compete for the shared capacity, but most installations are

limited to a few dozen users. Data trnasmission for both versions ranges from 1.5 Mbps to 54 Mbps, depending on the vendor.

I would recoomend the DL package at the cost of $60 per month for 1.5 Mbps downstream rate and 384 Kbps upstream rate. This package meets the Cathy's need for the capacity and speed to accomodate her uploading and downloading a lot of graphics whithin her apartment complex. This package would also help Cathy to avoid the

problem of her message being hacked,

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