Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622326
M. Treado
In order to better understand the ramifications of transmitting and receiving digital data over typical voice channels, a series of tests were performed in Allegheny County, Pennsylvania, using existing local government transmitting sites and a specially equipped mobile unit. Carrier frequency, digital data transmission rate, modulation technique, range of transmis sion, speed of the mobile unit and the time of day were varied for test purposes. Tests were conducted in both urban and suburban environments. This paper discusses test procedures, sites, routes, test equipment and the results obtained.
{"title":"Digital data transmission tests over voice channels","authors":"M. Treado","doi":"10.1109/VTC.1976.1622326","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622326","url":null,"abstract":"In order to better understand the ramifications of transmitting and receiving digital data over typical voice channels, a series of tests were performed in Allegheny County, Pennsylvania, using existing local government transmitting sites and a specially equipped mobile unit. Carrier frequency, digital data transmission rate, modulation technique, range of transmis sion, speed of the mobile unit and the time of day were varied for test purposes. Tests were conducted in both urban and suburban environments. This paper discusses test procedures, sites, routes, test equipment and the results obtained.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114773384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622336
J. Greenway
This paper will describe the design, installation and operation of a multi-frequency rapid transit radio system utilized by the Washington Metropolitan Area Transit Authority. It will contain discussions of the civil construction considerations, operational constraints and technical engineering detail that has gone into the implementation of the system. It will also touch briefly on those elements that might be changed or modified in light of actual operating experience.
{"title":"Voice communications in a rapid transit tunnel environment","authors":"J. Greenway","doi":"10.1109/VTC.1976.1622336","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622336","url":null,"abstract":"This paper will describe the design, installation and operation of a multi-frequency rapid transit radio system utilized by the Washington Metropolitan Area Transit Authority. It will contain discussions of the civil construction considerations, operational constraints and technical engineering detail that has gone into the implementation of the system. It will also touch briefly on those elements that might be changed or modified in light of actual operating experience.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130849086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622335
P. C. Johnson
Three applications of modern technology are described in the field of fare collection for a regional transit system, including both bus and rail operations. The first application described includes electrical/electronic/pneumatic technology used in revenue-handling for Metrobus operations. The equipment is installed and operating in slightly over half our garages which account for approximately forty percent of our fleet. Installation and test are underway to complete the conversion by 31 May 1976. Ten installations are programmed for eight garages and approximately 1900 buses. The second application describes the use of stored-value Farecards for travel on our Metrorail system. This equipment embodies magnetic-stripe technology and a large number of microprocessors. First deliveries are scheduled this fall, and it is expected that, when the second group of rail stations is opened in early 1977, enough of this equipment will be available to equip all stations then in revenue operations. The third application describes an unmet need. Bus equipment which can handle the Metrorail Farecard is an obvious and anticipated extension of the system. Unfortunately, funding limitations have halted an UMTA/Mitre effort which was leading to such equipment. The needs of the system, and a brief description of the effort to date, may inspire some readers to pursue the matter further.
{"title":"The technology of fare collection in use by WMATA","authors":"P. C. Johnson","doi":"10.1109/VTC.1976.1622335","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622335","url":null,"abstract":"Three applications of modern technology are described in the field of fare collection for a regional transit system, including both bus and rail operations. The first application described includes electrical/electronic/pneumatic technology used in revenue-handling for Metrobus operations. The equipment is installed and operating in slightly over half our garages which account for approximately forty percent of our fleet. Installation and test are underway to complete the conversion by 31 May 1976. Ten installations are programmed for eight garages and approximately 1900 buses. The second application describes the use of stored-value Farecards for travel on our Metrorail system. This equipment embodies magnetic-stripe technology and a large number of microprocessors. First deliveries are scheduled this fall, and it is expected that, when the second group of rail stations is opened in early 1977, enough of this equipment will be available to equip all stations then in revenue operations. The third application describes an unmet need. Bus equipment which can handle the Metrorail Farecard is an obvious and anticipated extension of the system. Unfortunately, funding limitations have halted an UMTA/Mitre effort which was leading to such equipment. The needs of the system, and a brief description of the effort to date, may inspire some readers to pursue the matter further.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124868993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622327
R. Mayhan
A method of generating a continuous position reference signal for use in the longitudinal control of automated ground transport systems is presented. The technique utilizes two specially excited four-wire helically wound transmission lines. The method of excitation, the signal detection and processing schemes necessary to obtain the control signal, and the results of preliminary laboratory tests are presented. The technique should provide a highly accurate, easily implementable and environmentally impervious means of generating a longitudinal reference signal.
{"title":"A continuous longitudinal control signal via the low frequency excitation of helical transmission lines","authors":"R. Mayhan","doi":"10.1109/VTC.1976.1622327","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622327","url":null,"abstract":"A method of generating a continuous position reference signal for use in the longitudinal control of automated ground transport systems is presented. The technique utilizes two specially excited four-wire helically wound transmission lines. The method of excitation, the signal detection and processing schemes necessary to obtain the control signal, and the results of preliminary laboratory tests are presented. The technique should provide a highly accurate, easily implementable and environmentally impervious means of generating a longitudinal reference signal.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125155293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622319
M. Oleyar
Various levels of protection from unauthorized use of a mobile-telephone service can be provided where the exchange for the service is under stored-program control. The security techniques that provide this protection can be upgraded on a per-subscriber or per-system basis as the incidence of unauthorized use increases. The "ultimate" arrangement provides for the encryption of variable passwords. Proper protection of auxiliary storage devices precludes compromise of the cipher-keys assigned to individual mobile units. The techniques that apply and, in particular, those that provide for better security, are more readily implemented in a system with common channel signaling where signaling speeds are considerably faster than those that are used in present-day practice.
{"title":"Address security concepts for mobile-telephone service","authors":"M. Oleyar","doi":"10.1109/VTC.1976.1622319","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622319","url":null,"abstract":"Various levels of protection from unauthorized use of a mobile-telephone service can be provided where the exchange for the service is under stored-program control. The security techniques that provide this protection can be upgraded on a per-subscriber or per-system basis as the incidence of unauthorized use increases. The \"ultimate\" arrangement provides for the encryption of variable passwords. Proper protection of auxiliary storage devices precludes compromise of the cipher-keys assigned to individual mobile units. The techniques that apply and, in particular, those that provide for better security, are more readily implemented in a system with common channel signaling where signaling speeds are considerably faster than those that are used in present-day practice.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116515210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622341
B. H. Flood, L. K. Russell
In 1972, the Arizona State Legislature established the Division of Emergency Medical Services within the Arizona Department of Public Safety (DPS). As a part of that legislation, the Legislature charged the Director of the Department of Public Safety with the responsibility for the establishment, operation and maintenance of the Statewide Emergency Medical Services Communications System. This system was to have the capability of providing for intercommunication of all law enforcement agencies and personnel, ambulances, ambulance services and dispatchers, and emergency receiving facilities and other health care institutions and medical practitioners. With financial assistance from the U.S. Department of Health Education and Welfare, the Department of Public Safety embarked upon a demonstration program of developing an EMS Communications System (EMSCOM) across the northern part of the State of Arizona. The primary aim of the program was to find the most effective means of providing two-way voice communications between the various elements of the Emergency Medical Services System over large geographic areas with a very sparse population located in relatively few population centers. The UHF system--designed, purchased and installed prior to new EMS frequencies, made available by the Federal Communications Commission by their rule making in Docket #19880--presented a number of technical and operational problems related to radio signal propagation characteristics over our large geographic areas and rugged terrain. Efforts to minimize the geographic signal propagation problems resulted in the incorporation of receiver voting--as well as associated transmitter selection--techniques. Design of the dispatch control console incorporated features to allow the console operator to communicate with all hospitals, ambulance drivers, and paramedics over the entire area of operation. The control console also incorporated the use of telephone patching equipment to allow all elements of the Emergency Medical Services System to communicate with each other through two-way radio, microwave, and telephone facilities.
{"title":"Arizona's rural emergency medical services communications system","authors":"B. H. Flood, L. K. Russell","doi":"10.1109/VTC.1976.1622341","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622341","url":null,"abstract":"In 1972, the Arizona State Legislature established the Division of Emergency Medical Services within the Arizona Department of Public Safety (DPS). As a part of that legislation, the Legislature charged the Director of the Department of Public Safety with the responsibility for the establishment, operation and maintenance of the Statewide Emergency Medical Services Communications System. This system was to have the capability of providing for intercommunication of all law enforcement agencies and personnel, ambulances, ambulance services and dispatchers, and emergency receiving facilities and other health care institutions and medical practitioners. With financial assistance from the U.S. Department of Health Education and Welfare, the Department of Public Safety embarked upon a demonstration program of developing an EMS Communications System (EMSCOM) across the northern part of the State of Arizona. The primary aim of the program was to find the most effective means of providing two-way voice communications between the various elements of the Emergency Medical Services System over large geographic areas with a very sparse population located in relatively few population centers. The UHF system--designed, purchased and installed prior to new EMS frequencies, made available by the Federal Communications Commission by their rule making in Docket #19880--presented a number of technical and operational problems related to radio signal propagation characteristics over our large geographic areas and rugged terrain. Efforts to minimize the geographic signal propagation problems resulted in the incorporation of receiver voting--as well as associated transmitter selection--techniques. Design of the dispatch control console incorporated features to allow the console operator to communicate with all hospitals, ambulance drivers, and paramedics over the entire area of operation. The control console also incorporated the use of telephone patching equipment to allow all elements of the Emergency Medical Services System to communicate with each other through two-way radio, microwave, and telephone facilities.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128592697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622325
M. R. Karim
In the BTL-developed High Capacity Mobile Telecommunications System, a digital controller within the mobile Logic Unit allows mobiles to communicate with Cell Sites by means of a high-speed radio data link, and interacts with the user via switches and displays. This paper presents an overview of the controller. The switching and control functions that it performs and digital messages involved are first briefly described. This is followed by a description of its hardware design that exploits a microprocessor as the central processing unit.
{"title":"A controller for the mobile logic unit in the BTL high capacity mobile telecommunications system","authors":"M. R. Karim","doi":"10.1109/VTC.1976.1622325","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622325","url":null,"abstract":"In the BTL-developed High Capacity Mobile Telecommunications System, a digital controller within the mobile Logic Unit allows mobiles to communicate with Cell Sites by means of a high-speed radio data link, and interacts with the user via switches and displays. This paper presents an overview of the controller. The switching and control functions that it performs and digital messages involved are first briefly described. This is followed by a description of its hardware design that exploits a microprocessor as the central processing unit.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115146859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622342
A.J.J. Sluyter
This paper discusses Emergency Medical Service Systems with a primary emphasis on Land Mobile communication systems. The basic purpose of EMS systems and the applicable FCC Rules and Regulations are reviewed. Descriptions of several communication systems follow including how the various systems address some of the common EMS requirements and problem areas.
{"title":"Emergency medical services communication systems","authors":"A.J.J. Sluyter","doi":"10.1109/VTC.1976.1622342","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622342","url":null,"abstract":"This paper discusses Emergency Medical Service Systems with a primary emphasis on Land Mobile communication systems. The basic purpose of EMS systems and the applicable FCC Rules and Regulations are reviewed. Descriptions of several communication systems follow including how the various systems address some of the common EMS requirements and problem areas.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"270 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114344256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622316
E. Frost
This paper covers a mobile radiotelephone system designed to upgrade present day Land-Mobile services to provide facilities comparable to those obtainable within any national land-based automatic switching telephone system. It shows a system which may provide national coverage, requiring minimal cooperation from individual participating RCC's, by use of interactive base stations.
{"title":"A comprehensive automatic mobile radio telephone system","authors":"E. Frost","doi":"10.1109/VTC.1976.1622316","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622316","url":null,"abstract":"This paper covers a mobile radiotelephone system designed to upgrade present day Land-Mobile services to provide facilities comparable to those obtainable within any national land-based automatic switching telephone system. It shows a system which may provide national coverage, requiring minimal cooperation from individual participating RCC's, by use of interactive base stations.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124845496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622318
R. Plessinger
{"title":"Use of 15 KHz offset channels for radio common carriers in the 150 MHz band","authors":"R. Plessinger","doi":"10.1109/VTC.1976.1622318","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622318","url":null,"abstract":"","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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