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1200 bps 2400 bps 14,400 bps 9600 bps 28,000 bps 57,600 bps 57,600 bps
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The current modem standard now on the market is the V92 standard V92 has the same download speed as the V90, but upstream rates increase to as much as 48 Kbps If your modem is having trouble getting 56-Kbps rates with V90 in your area, you will not notice an improvement V92 also offers a Quick Connect feature, which implements faster handshaking to cut connection delays Finally, the V92 standard offers a Modem On Hold feature, which enables the modem to stay connected while you take an incoming call-waiting call or even initiate an outgoing voice call This feature only works if the V92 server modem is configured to enable it TIP Do not memorize these V standards just know what they do
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In addition to speed standards, the CCITT, now known simply as ITU, has established standards controlling how modems compress data and perform error checking when they communicate These standards are as follows:
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The beauty of these standards is that you don t need to do anything special to enjoy their benefits If you want 56-Kbps data transfers, for example, you simply need to ensure that the modems in the local system and the remote system both support the V90 standard Assuming you have good line quality, the connections will run at or at least close to 56 Kbps
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ISDN
PSTN lines traditionally just aren t that good While the digital equipment that connects to a PSTN supports a full 64-Kbps DS0 channel, the combination of the lines themselves and the conversion from analog to digital means that most PSTN lines rarely go faster than, at most, 33 Kbps and, yes, that includes the 56-Kbps connections There are many pieces to a PSTN telephone connection First, there s the modem in your computer that converts the digital information to analog Then there s the phone line that runs from your phone out to your NIU and into the central office The central office stores the modems that convert the analog signal back to digital and the telephone switches that interconnect multiple individual local connections into the larger telephone network A central office switch connects to long-distance carriers via high-capacity trunk lines (at least a T1) and will also connect to other nearby central offices The analog last mile was an awful way to send data, but it had one huge advantage: most everyone owned a telephone line During this upgrade period, customers continued to demand higher throughput from their phone lines The phone companies were motivated to come up with a way to generate higher capacities Their answer was fairly straightforward: make the last mile digital Since everything but the last mile was already digital, by adding special equipment at the central office and the user s location, phone companies felt they could achieve a true, steady, dependable throughput of 64 Kbps per line over the same copper wires already used by PSTN lines This process of sending telephone transmission across fully digital lines end-to-end is called Integrated Services Digital Network (ISDN) service NOTE ISDN also supports voice, but requires special ISDN telephones
ISDN service consists of two types of channels: Bearer channels (B channels) carry data and voice information using standard DS0 channels (64 Kbps), while Delta channels (D channels) carry setup and configuration information at 16 Kbps Most providers of ISDN let the user choose either one or two B channels The more common setup is two B/one D, 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 There is also a type of ISDN called Primary Rate Interface (PRI) ISDN PRI is actually just a full T-1 line, carrying 23 B channels The physical connections for ISDN bear some similarity to PSTN modems An ISDN wall socket is usually something that looks like a standard RJ-45 network jack This line runs to your demarc In home installations most telephone companies will install a second demarc separate from your PSTN demarc The most common interface for your computer is a device called a terminal adapter (TA) TAs look like regular modems and, like modems, come in external and internal variants You can even get TAs that also function as hubs, enabling your system to support a direct LAN connection (Figure 14-21)
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