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A Special Supplement of CED Magazine. the a T of ADDRESS ILITY THE MAGAZINE OF BROADBAND TECHNOLOGY/APRIL 1990 A special supplement of CED Magazine. THE A T OF ADDRESS ILITY There's an art to creating an addressable cable system. The Pioneer BA-6000 converter brings all the right elements together to create state-of-the-art addressability. The composition of such features as volume control, multi-vendor scrambling compatibility, PPV/IPPV capability, VCR program timer, VCR filter, four digit display, and unmatched security illustrate the lasting impression of apicture-perfect addressable converter. The BA-6000 paints an attractive picture for cable operators. (11) PION COW 600 East Crescent Ave. •Upper Saddle River, NJ 07458 (201)327-6400 Outside New Jersey (800) 421-6450 (c) Copyright 1990 Reader Service Number 1 Perfection in Dielectrics. Trilogy Communications built abetter means immediate savings. coaxial cable -MC 2-and the CATV industry is All this plus the highly respected Trilogy letting us know about it. program of delivery and service provides our The MC2 air dielectric combines excellent customers with the attention and performance product durability and flexibility with air-tight that are second to none. fully-bonded construction. Our 93% velocity Our most prized dynamics are your of propagation provides the purest signal acceptance of our best effort so far -MC 2 air over the longest chstance -fewer amplifiers dielectric coaxial cables. Reader Service Number 2 COMMUNICATIONS INC. Cat or write for our free sample and brochure: TRILOGY COMMUNICATIONS INC., 2910 Highway 80 East, Pearl, Mississippi 39208 800-874-5649 •601-932-4461 •201-462-8700 CR171 THE PROBLEM Direct pickup interference 8 Subscribers who plug cable directly into their cable-ready TVs are plagued with ghosts and beats caused by poor quality consumer electronics. Yet subscribers almost universally blame the cable operator. Del Heller of Viacom Cable describes the problem and steps the industry can take to get the consumer electronics manufacturers' attention. How the mess was created 12 The problems associated with interfacing cable-TV with consumer gear grew out of alack of communication between the two industries, according to Walt Ciciora of ATC. However, joint committees and regular communication has led not only to a reduction in the growth of problems, but some real solutions. THE SOLUTIONS The evolution of the CATV converter 19 As more and more hardware has been introduced into American About the Cover: homes, the cable converter has had to work harder and harder Making CATV more compatible with to remain inconspicuous atop the television. CED Contributing consumer gear remains an elusive Editor George Sell provides an historical view of the efforts dream, but one worth pursuing. converter manufacturers have made to remain friendly with stereo TV, VCRs, cable-ready equipment and other gear. The economic impact of the EIA MultiPort 25 A product that grew out of joint efforts by the EIA and NCTA, MultiPort offers along-term solution to the interface problem between the TV and VCR in ascrambled environment. But the product has seen limited acceptance because of numerous financial reasons. Claude Baggett of CableLabs examines these reasons and provides alittle perspective on the benefits of MultiPort. Cable TVs' role in home automation 30 Much has been written about the automated 'home of tomorrow,' in which consumer devices can literally 'talk' to one another, but where does CATV fit in? Um Mock of the Electronic Industries Association explains what the Consumer Electronics Bus is, its status and how cable-TV is expected to fit in with it all. Off-premise: coming full circle 33 Originally conceived more than adecade ago, off-premise addressability is hardly anew idea. But it is experiencing a A tangled web of interface needs, p. 12 resurgence in interest because it is friendly with subscribers. Jim Farmer of Scientific-Atlanta explains how S-A's new interdiction system works and the benefits it brings to operators and viewers alike. Integrating electronics within the home 40 Jerrold Communications' approach to the problem of interfacing consumer and cable equipment is to integrate common functions within the home. Dan Moloney of Jerrold explains the concept and the progress being made on avariety of projects and products aimed at taking the hassle out of watching cable TV. The MultiPort issue, p. 25 4 CED Consumer Interface Handbook April 1990 THE MATRIX SYSTEM' The Matrix System is the on-premises addressable trap system that saves the oper- 1800 MID-CATV Now, designed for ator time and money. Truck rolls are reduced Corporate Offices single and multiple and addressability makes churn profitable. Charleston, WV (1 304 343-8874) The Matrix System takes the electronics Clarksburg, WV (1304 624-5459) dwelling units. out of the residence and places it where the Outside WV (1 800 532-2288) Lafayette. IN (1 317 448-1611) operator has easy access. Therefore, no Within IN (1 800 382-7526) recovery problems to deal with. Now you can Outside IN (1 800 428-7596) improve customer service by providing timely Ocala, FL (1 904 854-6511) Within FL (1 800 433-4720) channel upgrades. Outside FL (1 800 433-3765) Reader Service Number 3 Finally, a user friendly service for your Pottstown, PA (1 215 970-0200) (1 800 458-4524) subscriber. And for the operator, increased Dallas, TX (1 214 340-1515) revenues using pay per view. (1 800 421-4334) MIDWEST Two proven technologies. Traps for Denver, CO (1 303 773-2205) security and addressability for control. Dis- (1 800 232-9378) Phoenix, AZ (1 602 233-3555) tributed only by Midwest CATV. (1 800 782-4566) CATV For more information, give any of our A dMson of Midwest Corporation sales representatives acall. Patent Pending. More than supplies. Solutions. A case for ghostbusters e.n age-old specter continues to stalk a cable system cable country. Sightings of ghosts drop and observa- Are reported almost daily. These tions were made are particularly brazen fellers, appear- on the five local ing in cable customer's living rooms VHF stations in rather than hiding in the attic. the test market for These benign cable creatures result the presence of DPI from the almost simultaneous recep- ghosts. A well tion of the same VHF television broad- shielded set-top con- cast station. One signal is delivered by verter was first the cable system and the second, an used to determine identical image of the first, is picked if the cable system up by the cable customer's TV set was free of DPI directly off-air, because of poor electri- itself and the cable cal shielding in the TV set. Because of drop levels were propagation or timing differences be- adjusted to a uni- tween the two identical signals, one form signal level becomes the "ghost" or secondary of +5 dBmV. All image of the other. In cable parlance five television this phenomena is called DPI or Direct receivers had DPI ghosts on the local Pickup Interference. A normal television picture. Photo courtesy of NCTI VHF channels, A converter helps ranging in inten- sity from slight to Ironically, in these enlightened times severe. when off-premises and on-premises tech- The ambient nology and even the MultiPort ap- field strengths of proach is seen as the answer to the the five VHF sta- consumer interface dilemma, the only tions at the test effective antidote for DPI is the much site, which was ap- maligned set-top converter. proximately 1.5 The DPI problem is apart of cable's miles from the heritage, and set-top converters were transmit tower, used as an early preventive measure ranged in inten- for the problem. Other areas of early sity from 200 mil- incompatibility between aTV receiver livolts per meter and a cable TV system were channel to slightly in ex- tuning capabilities, input signal level cess of one volt per tolerances, and scrambled cable serv- meter. These ambi- ices. ent signal levels In 1982, a Joint EIA/NCTA Engi- are typical to those neering Committee was formed to work experienced by ca- on these issues. Represented on this ble TV customers A leading ghost, often created by direct pickup interference. in this particular committee were various consumer elec- Photo courtesy of NCTI tronics manufacturers and cable TV market. companies. The lengthy work of three compatible TV or VCR, A 1 volt per A follow-up test was conducted with subcommittees eventually produced a meter proposal has been "on the table" these same television receivers in an- channel identification and tuning stan- since 1987. Lacking an applicable U.S. other cable TV system, by additional dard called IS-6 (currently being up- standard, current cable compatible TVs members of the ELVNCTA committee, dated); the MultiPort descrambler in- and VCRs are built to a CanAdian with similar results. terface, now called EIA Standard 563; shielding standard of 100 millivolts per and ayet to be completed RF interface meter. Confusing results standard called IS-23. One segment of IS-23 deals with the Some performance tests The five test receivers were then issue of RF shielding in consumer subjected to a series of shielding tests electronics equipment. This RF shield- In 1984, under the sponsorship of the in aTV manufacturer's TEM cell. lbst ing standard relates to the DPI per- Joint ELVNCTA Engineering Commit- results were inconclusive in that no formance characteristics of a cable tee, DPI performance tests were con- direct correlations could be made in all ducted on five then-current brands and cases between the results of the field By Del Heller, Vice President of models of cable compatible TVs. Each tests and the TEM cell measurements. Engineering, Viacom Cable test receiver was connected in turn to However, the various tests did demon- 8 CED Consumer Interface Handbook April 1990 IMTCCCDE NCE The strate to the television manufacturers' specifically related to DPI trouble.
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