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Alternative to Telephony WAN
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Telephony WANs were the first big connections They re still the core of what makes up most of the Internet backbone and private connections, but have given way to more advanced technologies The three biggest newer technologies for Internet connections are Ethernet, DSL, and cable modems I need to give them a quick mention here Many ISPs provide straight Ethernet connections As you should well appreciate by now, Ethernet has some serious distance limitations, covering no more than a kilometer, except for very expensive single mode fiber solutions This limits Ethernet to places like large cities where you as a customer are close to your ISP On the other hand, Ethernet links are extremely easy to set up, because you usually have nothing more than a fiber cable that you connect directly to a router Many companies are dropping T1 and other slower options for the speed of Ethernet DSL and cable have been around for quite a while and deserve some serious discussion However, you can t install your own DSL or cable modem connection as you can with telephony WANs carriers For example, you can t have your own private cable modem connection between two of your offices DSL and cable modems are only for Internet connections and, as a result, are really more of a last-mile issue let s discuss DSL and cable in the next section
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Speed is the key to the Internet, but historically there s always been one big challenge: getting data from central offices to individual users This wasn t a problem for larger
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14: Remote Connection Basics
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companies that could afford their own WAN connections, but what about individuals and small companies that couldn t or wouldn t pay hundreds of dollars a month for a T1 This area, the infamous last mile, was a serious challenge early on for both Internet connections and private connections because the only common medium was POTS lines A number of last-mile solutions have appeared over the years, and the CompTIA Network+ exam tests you on the most popular ones Let s begin with the granddaddy of them all, the telephone line that runs to your house
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There are many different types of telephone lines available, but all the choices break down into two groups: dedicated and dial-up Dedicated lines are always off the hook (that is, they never hang up on each other) A dedicated line (like a T1) does not have a phone number In essence, the telephone company creates a permanent, hard-wired connection between the two locations, rendering a phone number superfluous Dial-up lines, by contrast, have phone numbers; they must dial each other up to make a connection When they re finished communicating, they hang up Two technologies make up the overwhelming majority of dial-up connections PSTN and ISDN
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The oldest, slowest, and most common original phone connection is the Public Switched Telephone Network (PSTN) PSTN is also known as Plain Old Telephone Service PSTN is just a regular phone line, the same line that used to run into everybody s home telephone jacks from the central office of your local exchange carrier (LEC the telephone company that provides local connections and usually the one who owns your local central office) Because PSTN was designed long before computers were common, it was designed to work with only one type of data: sound Here s how it works The telephone s microphone takes the sound of your voice and translates it into an electrical analog waveform The telephone then sends that signal through the PSTN line to the phone on the other end of the connection That phone translates the signal into sound on the other end using its speaker The important word here is analog The telephone microphone converts the sounds into electrical waveforms that cycle 2400 times a second An individual cycle is known as a baud The number of bauds per second is called the baud rate Pretty much all phone companies PSTN lines have a baud rate of 2400 PSTN uses a connector called RJ-11 It s the classic connector you see on all telephones (Figure 14-18)
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Figure 14-18 RJ-11 connectors (top and side views)
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