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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

support CT system configurations described in this chapter, but these can be used only in the configuration(s) and on the operating system(s) for which they were implemented CT hardware components that implement proprietary protocols also may be found within turnkey custom CT solutions These solutions may be developed to encompass one or more CT system configurations described in this chapter, but once again can be used only in the configuration(s) and on the operating system(s) for which they were implemented

#define MAX 100 /* structure of the flight database */ struct FL { char from[20]; char to[20]; int distance;

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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)

Page 615 char skip; /* used in backtracking */ }; struct FL flight [MAX]; /* array of db structures */ int f_pos = 0; /* number of entries in flight db */ int find_pos = 0; /* index for searching flight db */

In this chapter we explore the many different types of software components that may play a role in a CTI or media services system These range from protocol stack implementations, to various APIs, to different categories of application software This chapter covers the layering and relationships among the various types of CT software components and describes the role of each type of component in a CT solution While the overall framework for CT software components is independent of the operating system involved, the implementations of certain components represent significant de facto standards in their own right Sections of this chapter specifically describe certain portions of the CT software framework as they are implemented for the two leading personal computing operating systems: Apple Computer's MacTM OS and Microsoft's WindowsTM operating system Apple's framework for CT is called the Macintosh Telephony Architecture, or MTA Microsoft's set of specifications is called Windows Telephony The ECTF framework and associated specifications provide complementary platform-neutral interfaces for 'C' and Java on both of these platforms as well as all others, including Linux and variations of Unix

Individual entries are placed into the database using the function assert_flight( ), and setup( ) initializes all the flight information The global f_pos holds the index of the last item in the database These routines are shown here:

All very nice, you say, but why hassle with this packet in a frame business when you could just use MAC addresses For that matter, why even bother with this IP thing in the first place Good question! Let s get back to talking about routers! Let s say that Janelle wants to access the Internet from her PC using her cable line A tech could add a cable modem directly to her computer, but the boss wants everyone on the network to get on the Internet using a single cable modem connection To make this possible, the MHTechEd network will connect to the Internet through a router (Figure 2-33)

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