tailieunhanh - Laptops All-in-One Desk Reference For Dummies- P66

Laptops All-in-One Desk Reference For Dummies- P66: Okay, I’ll admit it: I’ve got a strange biography. I’ve been a writer all my life. My first semi-pro job was sports editor of my high school newspaper. (Go Commodores!) After college I was a political reporter for daily newspapers in Ohio and New York (I covered four national nominating conventions and two Presidential campaigns) and a correspondent for The Associated Press. And then, in 1983, I gave in to my inner geek and became the first Executive Editor of PC Magazine, back in the days when most people asked, “What is a PC?”. | 624 Letting Your Fingers Do iMing Figure 5-13 An Instant Messenger session from within AOL you can also obtain an account and a copy of the program to use from a Windows desktop. show Eveiyoi E Buddies 1 3 SR Family 0 4 Co-Workers 00 Recent Buddles 0 0 Hey buddy. Did you stay up late to see the Red Need to w to a çelIphone7 Chapter 6 Communicating with VoIP In This Chapter Making phone calls without the phone company Getting a good VoIP when you need one Testing the quality of an Internet phone call Making beautiful music VoIP and laptops yB Zhen the Internet began to take hold in the 1990s it didn t take long W for engineers to realize two important things about the plain old telephone system POTS Although some small incremental improvements could be made to the system it was no longer practical to use the original phone system for Internet communication. The new high-speed high-capacity means of communication including broadband connections like cable DSL and fiber-optic links could be used for much more than merely transmitting data. Like what Video audio . . . and telephone service. Voice over IP VoIP comes in on the considerably more modern and capable coaxial cable strung by what used to be called the cable television company. VoIP networks are much more efficient than the old-style telephone network. They don t need to open and maintain a sustained connection between the caller and the recipient any two points on the Internet are never really connected but instead are basically tuned into the data stream looking for packets addressed their way. Because a call is broken into millions of little packets the network can easily share cables and wireless transmission media amongst thousands of users at the same time. Because the packets are digital computers can squeeze all the air and silence out of a signal and send only the information that matters. By some estimates a VoIP call that takes five minutes from beginning to end might occupy the equivalent amount of