19 Automated Test System for Addressable Descramblers 35
Total Page:16
File Type:pdf, Size:1020Kb
CCommunications Engineering Digest/The Magazine of Broadband Technology 19 Automated test system for addressable descramblers 35 Using microprocessors for headend/system reliability 47 Computer graphics for drafting and design 48 Product Profile: Trunk and distribution cable 66 Cable-Tec Expo exhibitors booth guide May 1983 FROM MINI TO MAXI.... THE vosE CHOICE IN HEADEND EQUIPMENT Whether it's 5 channels for an SMATV acoustic wave) filters and advanced solid state installation or 108 or more channels for a major circuitry to insure accurate signals with less HRC installation, the right choice is Phasecom— maintenance. And whether you need a "Mini" or the headend-wise company. We've specialized in a "Maxi," Phasecom can supply it in trouble- headend electronics for over a decade now, saving pre-pack cabinets completely wired and gaining the experience and know-how to pro- ready for plug-in. vide you with important benefits—like more Find out the facts today about Phasecom performance for less cost, increased reliability, headend systems. After all, it's the wise thing faster installation and a superior customer to do! support program. Phasecom Corp., 6365 Arizona Circle, All Phasecom modulators, demodulators, Los Angeles, CA 90045, Phone: (213) 641-3501, and heterodyne processors feature SAW (surface Telex: 181899 PHASECOM LSA Ji PHASECOM CORP. For testing satellite for quick and accurate indication So if you work with satellite communications components and of each parameter. A variable communications, and need a systems, the Wavetek Model 1084 is marker across the full sweep allows microwave sweep generator, the right on the money. Its 3.5 to 4.5 instant centering upon any portion Wavetek Model 1084 has your GHz frequency range blankets the of the sweep, and a simple push- numbers. spectrum, and the $2995 price button provides narrow-band For details, contact Wavetek won't send your financial manager sweep around the marker Indiana, 5808 Churchman, PO. Box into orbit. frequency. 190, Beech Grove, IN 46107. Phone That price includes many Crystal-controlled harmonic Toll Free (800)-428-4424. (In Indiana features normally found only on far markers at 1, 10 and 100 MHz allow call (317)-787-3332.) TWX 810- more expensive instruments. accurate measurements of 341-3226. For instance, digital readout of bandpass response and linearity both output power and frequency measurements. W AVŒTe • • SWEEP GEWEILATOR MODEL 084 MHz »00 -45.0MH/ dam SWEEP WIDTH t o • el; - • Multichannel News—January 10, 198 3 CableBus Systems, Jer- rold, S-A and Tocorn was considered to be viable evaluated for home for Coincases Philadel- monitoring services, ti phia system," the com- with Little reporting pany recommended use "each of these vendor's A. D. Little Recommends of jerrold's Starcom 450 - one-way addressable systems would Comcasesbe well qualified" in lerrold tor ?hilly Systemooked at boxes because d the facet LittI L l ?hilly operation. But, • eer. Oak, best integration of the Little added, Tocom, BALA CYNWYD, l'A — Jerrold, recommended IPPV Tocom and Zeni th because of its experience Noted research and con- system with the one-way equipment. Recom: and capability, would be sulting firm Arthur D. mended was Jerrold's boxes. the first choice to be Little Inc. was hired by E-Com, Jerrold and "St arcom 450 addre ss- used for both security Comcast Corp. to Tocom general purpose nverters w ith the and energy manage- recommend equipment ti able co digital systems were con- SV-A m odular ti ment. Apart from vendors for Comcast's Starvue sidered, with Jerrold attachment for IPPV energy management, d Philadelphia again getting the nod. propose because of this system's though, Little said Corn- The report found )er- cable system. technical elegance, low cast should itself choose In a I36-page report, void's Communicoml risk of unavailability and "among these home Little recommended Jer- Metronet system "quali- ti relatively low cost," the security system vendors rold Division of General fied and attractive" e based on its own judg- Instrument more often report said. because of its respons And while the ment concerning fea- than any other company. to innovation, high ti one-way tures, cost and terms of According to the study, capacity and fle%ibility to reseaaddressablerch fo nconverters Little considered, in meet new needs. purchaser assessing each vendor's from Jerrold, Oa k, Equipment from Scientific-Atlanta, equipment: Tocom an dZ enith "were •product features and capabilities; .soundness of techni- It nice to hear athird party confirm cal approach; •compatibility vvith what we've been working for all along. other system compo- When anoted research and con- nents; sulting firm was asked to recommend •risk of unavailability equipment suppliers for Comcast's of the product when proposed Philadelphia cable system, needed by Comcast; they recommended Jerrold. They rec- •ability to satisfy ommended Jerrold more often than capacity requirements of Scientific-Atlanta. More often than a large subscriber Oak, Zenith, Pioneer, TOCOM, E-Com, population as projected or Cablebus Systems combined! in Philadelphia; and, They said our addressable systems •estimated cost per have "technical elegance:' Plus "low risk of unavailability and relatively subscribe r. low cost' •For tvvo-way sub- If that's what you've been looking scriber response (IPP'V) services, deemed to be for all along, you may want to give us acall. General Instrument Corporation, the mo st important Jerrold Division, 2200 Byberry Road, Hatboro, PA 19040, (215) 674-4800. Jerrold. First in cable TV. GENERAL 0 19E13 General Instrument Corp. INSTRUMENT CD) TECHSCOPE 'Metro Tech' plans finalized 7 Plans to construct a$400 million telecommunications center at the base of the Brooklyn Bridge have been finalized between the city of New York and the Polytechnic Institute of New York. SEMINARS SCTE, CCTA meets 9 The SCTE's first Cable-Tec Expo, the 26th annual convention of the Canadian Cable Television Association and a handful of state and regional meetings highlight this month's calendar. COMMUNICATION NEWS Cabling the Netherlands 13 Holland is offering American cable hardware and software suppliers achance to participate in a $20 million two-way CATV test project in the province of Limburg. FEATURES Testing addressable descramblers 19 Equipment and software developed by Gill Cable allow system operators to evaluate various brands of addressable descramblers in a fully automated test system. Microprocessors for headend/system reliability 35 13 There is not an equipment category that has not been affected profoundly by advances in design, much of it predicated on developments in microprocessor applications. GNIS DATA CENTER TECH II GILL CABLE OFFICES ADORESSADLI INTRODUCTION HP 1000 Strand mapping today 45 POOKSS 11140 CPU 011110 1E111.11110. The techniques may change and the processes may consolidate, but strand mapping still 11 embraces the fundamental art of laying the initial groundwork for acable system. Some of the ISUBSCRIBER DEVICES advances addressed in this month's TECH Il use microcomputers to handle mapping and FACILITY design data and a splicers manual to eliminate confusion about equipment placement. 01510111 U1IÓN 5,1101 TRENDS 19 Computer graphics for drafting and design 47 A Mapping And Graphic Integrated Computer System (MAGIC) from Coaxial Analysts allows deign engineers to perfect electronic drafting, while simplifying design engineering and trouble shooting. SCTE Cable-Tec Expo booth guide 66 Our booth guide provides a complete listing of exhibitors for the SCTE's first-ever Cable-Tec Expo. DEPARTMENTS People 61 Ad Index 64 Product News 65 In Orbit 74 About the cover Classified Ads 62 Digital Equipment Corp.'s MICRO/J-11 16/32-bit microprocessor is fabricated in CMOS technology and puts the full ©1983 by Titsch Communications Inc. All rights reserved. CED (USPS 300-510) is published monthly by Titsch Communications, Inc., functionality and capability of the DEC 2500 Curtis, Suite 200, Denver, Colorado 80205. ©May, 1983, Volume 9, Number 5. Subscription Price: 1year, $26.00; 2years, $43.00, 3 PDP-11/70 computer in one 60-pin years, $63.00. OUTSIDE USA 1 yr. $64.00; 2 yrs. $89.00. MUST BE PREPAID IN US FUNDS ONLY! Second-class postage paid at Denver, CO. CED is published on behalf of all parties, including the Society of Cable Television Engineers (SCTE). POSTMASTER: package. Photo courtesy of Digital Please send address changes to P.O. Box 5727-TA, Denver, Colorado 80217-5727. BPA membership applied for May 1981. Equipment Corp. May 1983/5 c[nr A CLOSER LOOK AT ROART'S REINFORCED PEDESTAL — Now Competitively Priced and Superior to Steel — Multiple Layers... Multiple Advantages... — NON-CORROSIVE— Fiberglass cannot rust and is favored in coastal, tropical, and alkaline soil areas. Reduce maintenance costs by not having to replace unsightly, rusted-shut or structurally-affected pedestals. — SHAPE MEMORY— Fiberglass is impact resistant and will not dent. Always remains easy to open and close. — LOW PPOFILE— Less obtrusive in field. Road pedestals can be custom-made to your height requirements. — EXCELLENT INSULATOR— Decreases the chance of shorting circuitry or signal interference. — HEAT RESISTANT— Fiberglass will chemically extinguish flames. Fiberglass dissipates heat and, unlike steel's oven effect, fiberglass maintains a lower inside pedestal temperature. — LIGHTER WEIGHT— Reduces shipping costs, and installers prefer our lightweight pedestals which reduce fatigue and increase productivity. — UNIQUE PATENTED INTERLOCK- ING DESIGN — Seals out weather and insects, while allowing easy entry. UNIQUE — STRENGTH— Pound for pound, fiberglass is stronger than steel. INTERLOCK Fiberglass is used in boats, refinery DESIGN tanks,stairways, ladders, and more. provides environmental Fiberglass vs. Steel — protection but permits there's no comparison. instant cover removal. Call your local distributor Loosen one bolt and the cover lifts off. or contact us directly Close-tolerance con- for additional information. struction shuts out dust, dirt, rain, snow, Roart's Fiberglass and insects.