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How computer data travels over telephone lines using modems, the function of modems, their transmission speed measurement, and differentiates four types of digital data connections. It also describes how wireless networks function. Networks have expanded from military and government use to global reach, enabling small businesses and home users to connect and communicate with others around the world.
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(^) Networks were once used mainly by the military; universities, and large government agencies, bur today networks span the globe and reach into the average home. Today, millions of small businesses have set up connections to the Internet, enabling users to browse the World Wide Web and exchange e-mail. (^) Medium-sized and large businesses typically use networks to connect users for the same reasons as small businesses, but they also may use a large-scale LAN or WAN to connect departments or divisions that may be located in different buildings, regions, or even continents. Many businesses use a direct connection to the Internet to provide Internet access to their users. (^) Even a home computer user can be part of a truly global network. A connection to the Internet makes your home computer one of the millions of nodes on the vast Internet network. You can share files, collaborate communicate, and conference with people on the other side of the globe.
Modems (^) Modulator
Modem uses
Broadband connection (^) Several broadband technologies are being offered by the telecommunication industry today. The term broadband is used to describe any data connection that can transmit data faster than is possible through a standard dial- up connection using a modem. Some of the better known are called integrated services digital network (ISDN) , T l, T3, DSL, cable modems, and ATM. (^) To get an understanding of the increments in bandwidth, you need to know that a basic rate integrated services digital network (basic rate ISDN or BR I) connection combines two 64 Kbps data channels and one 19 Kbps error- checking channel.
(^) Another type of digital telephone service—called digital subscriber line (DSL) is very popular especially with home users. This is because DSL service is typical less expensive than T1 services in terms of hardware, setup, and monthly costs. In fact, many local telephone companies offer only DSL services in their markets, forgoing other broadband technologies altogether. (^) Several types of DSL, including the following, are available in different markets, each offering different capabilities and rates ranging from 100 Kbps to over 30 Mbps. ≫ Asymmetrical DSL (ADSL) ≫ Rate adaptive DSL (RADSL) ≫ High-bit-rate DSL (HDSL) ≫ ISDN DSL (IDSL) ≫ Symmetric DSL (SDSL) ≫ Very-high-bit-rate DSL (VDSL) The actual performance you can achieve with DSL depends on the type of DSL service you choose, the distance between the DSL modem and the telephone company's switch, and many other factors.
Wireless Networks (^) Most companies rely heavily on cabling. However, small awkward areas and older buildings make the use of wires very difficult. Also, although this situation is changing with newer homes, most older houses arc not wired with network cabling. (^) Rather than removing walls and spending many hours pulling cables or paying an electrician to do it, home owners arc opting for wireless networks. In addition, wireless technology allows connectivity so that portable and handheld computers can move around while being continuously connected to a network.
Wireless Networks
Class Activity 3 (^) Networks give us more choices and freedom in the workplace but they also can be misused. With this thought in mind, discuss the following questions Q1. Telecommuters enjoy working at home because it gives them more control over their schedules while removing the distractions that are part of the workplace. Realizing that they are no longer under the watch of a supervisor, however, some workers abuse their telecommuting privileges. What are the risks to business of allowing employees to telecommute? At what point is an employee abusing the freedom afforded by telecommuting? In your view, what kinds of activities or behaviors constitute such abuse? Q2. It is estimated that most occurrences of hacking are conducted by employees who pilfer data from their employers' networks and then sell or misuse that information. How for should companies go to prevent such abuse? What kinds of punishments are appropriate?
