Coaxial Cable Systems and Networks in Software

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Several methods are used to scramble or encode the premium channels One method is to remove the horizontal synchronizing signal, commonly known as sync suppression This type of scrambling is, of course, analog and works well with the standard NTSC video format Inverting the horizontal synchronizing signal with some form of alternating pattern offers a higher level of scrambling Such a method when working in conjunction with the subscriber addressable converter is still being used by many cable operators With the arrival of digital television, digital encryption techniques will certainly improve signal security to a very high level This apparently is what the cable television industry has been waiting for 2244 Addressable converters, or as they are known, addressable set tops, do two things for the cable operator The most important consideration is that subscribers can order program services over the telephone, and the cable operator can then download the authorization codes to the set-top converter Thus, the converter is activated to automatically make the changes and descramble any of the selected premium services Addressability enhances signal security since the set top has its own address code where its location address is known Now if this box is activated and stolen, and the service is not paid for, the box can be rendered inactive and hence useless 2245 Interactive converters are those set tops that can communicate directly with the hub/headend Such converters make pay-per-view channels quite easy to be seen by any of the subscribers, and services can be ordered directly through the remote control These converters can work the video on demand (VOD) systems some cable operators presently have in place Converters operating in this manner must have a reverse path of communications back to the main signal distribution point This reverse or return path usually operates in the sub-band (subsplit reverse) portion of the cable system A relatively small number of cable systems have the return path in the mid-band or high-band that actually contains a wider return band, offering more equivalent upstream television channels Interactive converters can be traced if stolen and detected in the wrong part of a cable system 2246 Connecting subscriber equipment to the cable system probably causes the most trouble for the subscriber It is basically the set-top converter that causes the TV set and VCR remote control to be ineffective in selecting television channels This problem causes many complaints from subscribers with cable service The use of switches to change or recon g-
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ure the subscriber s TV-VCR hookups may help the situation Also, smart remotes (programmable remote controls) can be programmed to operate all of the subscriber devices This problem really resulted from the television manufacturer s inability to address the cable television industry s speci cations A possible solution would be for the TV set to operate at the intermediate frequency provided by the set-top box and the VCR This subject has been under much discussion between cable operators and the consumer electronic manufacturers with the Cable Labs and the FCC advising at times Several subscriber equipment connections are shown in Figure 2-20 The National Cable Television Association (NCTA) released a publication addressing the interconnections between the cable converter, the TV, and the VCR This publication covered a large variety of interconnections using A-B switches, splitters and couplers, multiple converters, VCRs,
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Figure 2-20 Adding another converter, TV set, and VCR can make for a complicated home distributed system
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Configuration A:
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TV Set 1 and VCR views the unscrambled channel tuned by the converter TV Set 2 simply views any clear channel, if TV Set 2 is cable ready
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TV Set 1
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Configuration B:
TV Set 1 can view any clear cable channel when A/B switch is in position A VCR can be recording a pay TV channel selected by the converter For the TV set to view the pay channel, switch to position B and tune the set to the converter output channel
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