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A standard telephone connection comprises many pieces First, the phone line runs from your phone out to a network interface box (the little box on the side of your house), and into a central switch belonging to the telephone company Standard metropolitan areas have a large number of central offices, each with a central switch These central switches connect to each other through high-capacity trunk lines Before 1970, the entire phone system was analog Today, the entire telephone system, with the exception of the line from your phone to the central office, is digital By adding special equipment at the central office and the user s location, phone companies can now achieve a throughput of up to 64 K per line over the same copper wires already used by telephone lines This process of sending telephone transmission across fully digital lines end-to-end is called integrated services digital network (ISDN) service ISDN service consists of two types of channels: Bearer, or B, channels and Delta, or D, channels B channels carry data and voice information at 64 Kbps D channels carry setup and configuration information and carry data at 16 Kbps Most providers of ISDN allow the user to choose either one or two B channels The more common setup is two B/one D, usually called a basic rate interface (BRI) setup A BRI setup uses only one physical line, but each B channel sends 64 Kbps, doubling the throughput total to 128 Kbps The big limitation is that you usually need to be within about 18,000 feet of a central office to use ISDN The physical connections for ISDN bear some similarity to analog modems An ISDN wall socket usually looks something like a standard RJ-45 network jack The most common interface for your computer is a device called a terminal adapter (TA) TAs look much like regular modems, and like modems, they come in external and internal variants
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Another type of ISDN, called a primary rate interface (PRI), is composed of 23 64-Kbps B channels and one 64-Kbps D channel, giving it a total throughput of 15 Mbps PRI ISDN lines are rarely used as dial-up connections they are far more common on dedicated lines
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Increasingly, consumers and businesses are using dedicated high-speed connections such as DSL and cable to link their LANs to the Internet Almost all of x these dedicated connections use 10 BaseT Ethernet to connect a single PC or a switch to a special receiver called a DSL modem or cable modem
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Digital subscriber line (DSL) connections to ISPs use a standard telephone line but special equipment on each end to create always-on Internet connections at blindingly fast speeds, especially when compared with analog dial-up connections Service levels vary around the US, but the typical upload speed is ~384 Kbps, while download speed comes in at a very sweet ~2+ Mbps
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ADSL and SDSL The two most common forms of DSL you ll find are asynchronous (ADSL) and synchronous (SDSL) ADSL lines differ between slow upload speed (such as 128, 256, or 384 Kbps) and faster download speed (usually 2 Mbps) SDSL has the same upload and download speeds, but telecom companies charge a lot more for the privilege DSL encompasses many such variations, so you ll often see it referred to as x DSL DSL requires little setup from a user standpoint A tech comes to the house to install a NIC in the Internet-bound PC and drop off a DSL receiver (often called a DSL modem; see Figure 1832) The receiver connects to the telephone line and the PC (Figure 1833) The tech (or the user, if knowledgeable) then
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