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data les are frequently loaded and unloaded between user computers and mass storage facilities Many cable television systems operating today have the capacity to deliver high-speed data traf c to users connected to the system Thus, the transfer of large quantities of data can take place a lot faster by cable operators with available channel capacity In the past, typical cable operators avoided commercial areas simply because they believed no subscribers were present and decided not to place their systems there Cable operators interested in expanding their businesses by offering data-communication services to commercial enterprises will have to extend their plants to these areas In short, they will go where the business opportunities exist At present, many banks, department store chains, and gas stations, to name a few, use very small aperture terminal (VSAT) systems to provide data-communication services Most of these systems, however, operate in one direction with the upstream through the local exchange carrier (LEX) Cable systems should be able to provide such services to such customers
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513 Development of Data Communications
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Providing high-speed data-communication services to commercial businesses should provide much added revenue to cable system operators willing to upgrade and expand their distribution systems Many cable systems already have been exposed to digital signal transmission from the use of addressable converters Data communications using digital signal transmission will be used with many of the new cable modems for HDTV and pay-per-view program selections The progressive cable operator should install optical ber in both the downstream and upstream path along with standby power supplies needed to increase system reliability 5131 Soon after PCs appeared as of ce workstations, it became apparent that computer systems would need to be interconnected The rst solution was to use a dual-tone multifrequency (DTMF) method This method resulted in the acoustic coupler modem, in which the telephone handset was placed in a cradle that would translate digitally encoded data into DTMF tones Transmission could take place in both directions from the mouthpiece and the earpiece Of course, data communications were slow Next, the separate modem system was developed using frequency shift keying (FSK) The modem converted the digital data pulses into two frequencies representing ones and zeros FSK data received by the telco
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network was converted to pulsed signals and sent to the receiving computer via its input/output port Figure 5-7 illustrates modem development At present, most modems are plug-in cards inserted into the computer main circuit board (motherboard) and connected directly to the telephone system via a modular telephone connector plug As modems were required to transfer data at higher bit rates, the complexity of the modulation schemes increased From simple FSK modulation with a data rate of 300 to 600 bits per second, development led to binary phase shift keying, which increased the effective bit rate to 1200 bits per second (bps) Quadrature amplitude modulation (QAM) increased the telco modem effective bit rate to the present standards Current modem advertisements state the modem bit rate at 56 Kbps, quali ed by the statement that the speed at 56 Kbps depends on the line quality of the local exchange carrier (LEX) Because a cable television system could easily provide data rates equal or greater than this speed, the development of a cable modem is necessary for a cable operator to enter this phase of service 5132 The use of telco modems allowed residential and business computer systems to interconnect A network of simple dial-up modems and leased line systems produced an area network among connected users In-house networks where computers were connected via buses, switchers, and channel routers formed local area networks (LAN)
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Figure 5-7 Development of the telephone-computer modem
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Acoustic coupler
Computer I/O port
Computer workstation
2 Later
Telco system
Modem Computer I/O port Computer workstation
Digital Technology and Cable System Applications
52 Present Data Communications Systems
Present-day data networks consist of networks of owned intracompany networks connected to national and worldwide telephone systems that form a commercial telecommunication network LANs are connected to wide-area networks (WANs) to various interconnected providers, including the telephone systems and other common carrier operators It is here that progressive cable operators can provide a necessary and useful service to the telecommunications industry As noted in 1, the principal professional organization representing the cable television industry changed its name to the Society of Cable Telecommunication Engineers This was indeed an appropriate action Cable systems should be and are aligning their operations to provide not only television programming but also computer interconnection services Cable television operators, in the not-too-distant future, will be an Internet provider (IP) made possible by a cable modem Because the Internet offers voice service, cable operators acting as IPs also provide a form of telephony
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