C. Yen, R. Walker, W. McFarland, D. Cunningham, G. Kwan, T. Homak
HIPPI is an ANSI standard (X3.183-1991) for transmitting data in parallel between data processing equipment. To meet the need for transmitting HIPPI data serially on fiber or coaxial cable, serial-HIPPI was created. The authors describe the interface units required by serial-HIPPI, an extender for transmitting data serially between HIPPI nodes at 800 Mb/s or 1600 Mb/s.<>
{"title":"Serial extension for 800/1600 Mb/s computer interconnect","authors":"C. Yen, R. Walker, W. McFarland, D. Cunningham, G. Kwan, T. Homak","doi":"10.1109/ICC.1992.268066","DOIUrl":"https://doi.org/10.1109/ICC.1992.268066","url":null,"abstract":"HIPPI is an ANSI standard (X3.183-1991) for transmitting data in parallel between data processing equipment. To meet the need for transmitting HIPPI data serially on fiber or coaxial cable, serial-HIPPI was created. The authors describe the interface units required by serial-HIPPI, an extender for transmitting data serially between HIPPI nodes at 800 Mb/s or 1600 Mb/s.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122402250","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}
Through examples, several techniques are explored for controlling intersymbol interference (ISI) in the linear/programming design of the finite impulse response (FIR)-filter portion of a hybrid FIR-filter/analog-filter pulse-shaping system. The most promising technique, the explicit limiting or minimization of peak ISI, obtained as the sum of absolute values of system-pulse samples, results in an unexpected result. A central set of individual system-pulse samples is effectively zeroed, and the rest seem unaffected by the optimization.<>
{"title":"Linear-programming techniques for the control of intersymbol interference with hybrid FIR/analog pulse shaping","authors":"J. O. Coleman, D. Lytle","doi":"10.1109/ICC.1992.268175","DOIUrl":"https://doi.org/10.1109/ICC.1992.268175","url":null,"abstract":"Through examples, several techniques are explored for controlling intersymbol interference (ISI) in the linear/programming design of the finite impulse response (FIR)-filter portion of a hybrid FIR-filter/analog-filter pulse-shaping system. The most promising technique, the explicit limiting or minimization of peak ISI, obtained as the sum of absolute values of system-pulse samples, results in an unexpected result. A central set of individual system-pulse samples is effectively zeroed, and the rest seem unaffected by the optimization.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122485967","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}
A. Hastings, T. Macgregor, L. Steffes, R. Thompson
Six cost-effective and productivity-enhancing ISDN applications for use in office environments are presented. The applications include ISDN multipoint, ISDN host interface for terminal sessions, ISDN telephone call control via data terminal, video conferencing, and ISDN service direct to employees' homes. It is shown that ISDN provides foundations for the applications described. Several applications use off-the-shelf customer premises equipment; others use prototype equipment. Each application addresses a specific communications need.<>
{"title":"ISDN Centrex applications in a large multinational company","authors":"A. Hastings, T. Macgregor, L. Steffes, R. Thompson","doi":"10.1109/ICC.1992.267973","DOIUrl":"https://doi.org/10.1109/ICC.1992.267973","url":null,"abstract":"Six cost-effective and productivity-enhancing ISDN applications for use in office environments are presented. The applications include ISDN multipoint, ISDN host interface for terminal sessions, ISDN telephone call control via data terminal, video conferencing, and ISDN service direct to employees' homes. It is shown that ISDN provides foundations for the applications described. Several applications use off-the-shelf customer premises equipment; others use prototype equipment. Each application addresses a specific communications need.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129840036","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}
The authors propose methods for controlling the flow of traffic in gateways and evaluate their performance. A gateway can interconnect several LANs over a high-speed interconnecting backbone, in which case every LAN has a set of buffers assigned for input and output, respectively. System configurations are investigated where packet transfer times over the interconnecting backbone are negligible. The gateway control consists of a policy which determines when a packet from an input LAN buffer is allowed to be transferred to the output LAN buffer. An associated strategy determines from which input LAN buffer to transfer a packet at that time. Alternative strategies and policies are studied, and the optimal control of gateways is defined. An analytical model is introduced, showing the interconnected system performance in terms of throughput, packet loss probability, and the average packet delay for the optimal and other types of control.<>
{"title":"Configuration and control of gateways","authors":"I. Chlamtac, E. Wong","doi":"10.1109/ICC.1992.268127","DOIUrl":"https://doi.org/10.1109/ICC.1992.268127","url":null,"abstract":"The authors propose methods for controlling the flow of traffic in gateways and evaluate their performance. A gateway can interconnect several LANs over a high-speed interconnecting backbone, in which case every LAN has a set of buffers assigned for input and output, respectively. System configurations are investigated where packet transfer times over the interconnecting backbone are negligible. The gateway control consists of a policy which determines when a packet from an input LAN buffer is allowed to be transferred to the output LAN buffer. An associated strategy determines from which input LAN buffer to transfer a packet at that time. Alternative strategies and policies are studied, and the optimal control of gateways is defined. An analytical model is introduced, showing the interconnected system performance in terms of throughput, packet loss probability, and the average packet delay for the optimal and other types of control.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129631402","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}
The authors describe a distributed architecture based upon IEEE 802.6 metropolitan area networks (MANs) that will provide interconnection over a metropolitan area for wireless personal communications. An appropriate bridge routing strategy is suggested to interconnect the several MANs needed to cover an urban metropolitan area. A novel isochronous transport mechanism is proposed to facilitate speech silence suppression over the MAN. While a queue-arbitrated connectionless service is used for signaling over MANs to enable call setup and handoff, voice circuits are provided by means of the pre-arbitrated isochronous service. Connection issues within a metropolitan area relevant to call setup and handoff are examined. To facilitate capacity savings between voice talk spurts on the MAN, a technique is described which enables the isochronous service to accommodate data rate variations.<>
{"title":"A personal communication network architecture using the IEEE 802.6 MAN","authors":"A. D. Malyan, R. Donaldson, V. Leung","doi":"10.1109/ICC.1992.268041","DOIUrl":"https://doi.org/10.1109/ICC.1992.268041","url":null,"abstract":"The authors describe a distributed architecture based upon IEEE 802.6 metropolitan area networks (MANs) that will provide interconnection over a metropolitan area for wireless personal communications. An appropriate bridge routing strategy is suggested to interconnect the several MANs needed to cover an urban metropolitan area. A novel isochronous transport mechanism is proposed to facilitate speech silence suppression over the MAN. While a queue-arbitrated connectionless service is used for signaling over MANs to enable call setup and handoff, voice circuits are provided by means of the pre-arbitrated isochronous service. Connection issues within a metropolitan area relevant to call setup and handoff are examined. To facilitate capacity savings between voice talk spurts on the MAN, a technique is described which enables the isochronous service to accommodate data rate variations.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"63 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129909799","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}
The performance of a narrowband partial response signaling system in a frequency selective fading channel is studied for different receiver structures. Bit errors caused by Rayleigh fading are mitigated by periodically inserting pilot symbols that are used to provide amplitude and phase references at the receiver. It is shown that the delay spread tolerance of a quadrature partial response signaling, (QPRS) system is comparable to that of pi /4-quadrature phase shift keying (QPSK) systems. Analytical and computer simulation results indicate that the performance of bit-by-bit detection is the same as that of maximum-likelihood receivers in a fading channel, whereas the lattice has nearly 2.5-dB gain in the additive white Gaussian noise (AWGN) channel. The performance gain of two-branch maximum-ratio (MR) combining and selection diversity receivers which can be implemented in the baseband is also studied.<>
{"title":"Pilot symbol aided QPRS for digital land mobile applications","authors":"S. Gurunathan, K. Feher","doi":"10.1109/ICC.1992.268182","DOIUrl":"https://doi.org/10.1109/ICC.1992.268182","url":null,"abstract":"The performance of a narrowband partial response signaling system in a frequency selective fading channel is studied for different receiver structures. Bit errors caused by Rayleigh fading are mitigated by periodically inserting pilot symbols that are used to provide amplitude and phase references at the receiver. It is shown that the delay spread tolerance of a quadrature partial response signaling, (QPRS) system is comparable to that of pi /4-quadrature phase shift keying (QPSK) systems. Analytical and computer simulation results indicate that the performance of bit-by-bit detection is the same as that of maximum-likelihood receivers in a fading channel, whereas the lattice has nearly 2.5-dB gain in the additive white Gaussian noise (AWGN) channel. The performance gain of two-branch maximum-ratio (MR) combining and selection diversity receivers which can be implemented in the baseband is also studied.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167600","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}
In a loosely coupled parallel processor system, a number of concurrently executable processors communicate asynchronously via explicit messages over high-speed links. This architecture is similar to broadband ISDN networks and, thus, constitutes a realistic testbed for the modeling and distributed simulation. Every switching node of the communications network is modeled on a processor of the parallel processor and the traffic flow is represented by the communications protocols. Given that the models of the switching nodes are executed in parallel, the distributed simulation is expected to execute significantly faster than the traditional uniprocessor approach. This approach makes it possible to realistically model overloads in networks, study their impact on the network performance, and investigate new schemes to limit overloads from causing uncontrollable performance degradation. An implementation of the approach on the ARMSTRONG parallel processor at Brown University is described. Performance results, based on representative example B-ISDN networks, realistic traffic models, and network characteristics indicate that the distributed approach achieves significant speedup over the traditional approach. The utilization of the traffic capacities of the links is discussed.<>
{"title":"Modeling and distributed simulation of complex broadband ISDN networks under overload on loosely-coupled parallel processors","authors":"A. Bhimani, S. Ghosh","doi":"10.1109/ICC.1992.268034","DOIUrl":"https://doi.org/10.1109/ICC.1992.268034","url":null,"abstract":"In a loosely coupled parallel processor system, a number of concurrently executable processors communicate asynchronously via explicit messages over high-speed links. This architecture is similar to broadband ISDN networks and, thus, constitutes a realistic testbed for the modeling and distributed simulation. Every switching node of the communications network is modeled on a processor of the parallel processor and the traffic flow is represented by the communications protocols. Given that the models of the switching nodes are executed in parallel, the distributed simulation is expected to execute significantly faster than the traditional uniprocessor approach. This approach makes it possible to realistically model overloads in networks, study their impact on the network performance, and investigate new schemes to limit overloads from causing uncontrollable performance degradation. An implementation of the approach on the ARMSTRONG parallel processor at Brown University is described. Performance results, based on representative example B-ISDN networks, realistic traffic models, and network characteristics indicate that the distributed approach achieves significant speedup over the traditional approach. The utilization of the traffic capacities of the links is discussed.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128855419","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}
The authors give an overview of speech recognition systems and discuss design strategies for their use in portable communications. State-of-the-art speech recognition systems can recognize continuously spoken speech from a large vocabulary in real time. In the future, portable speech recognition systems will be made possible by advances in integrated circuit technology, by optimizing system architectures, and by exploiting the special features of personal communications systems. Types of speech recognizers are discussed. Current speech recognition systems are outlined. Personal communication systems with speech recognition are discussed.<>
{"title":"Using speech recognition in a personal communications system","authors":"A. Burstein, A. Stolzle, R. Brodersen","doi":"10.1109/ICC.1992.268002","DOIUrl":"https://doi.org/10.1109/ICC.1992.268002","url":null,"abstract":"The authors give an overview of speech recognition systems and discuss design strategies for their use in portable communications. State-of-the-art speech recognition systems can recognize continuously spoken speech from a large vocabulary in real time. In the future, portable speech recognition systems will be made possible by advances in integrated circuit technology, by optimizing system architectures, and by exploiting the special features of personal communications systems. Types of speech recognizers are discussed. Current speech recognition systems are outlined. Personal communication systems with speech recognition are discussed.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128383895","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}
Motivated by the observations in the characterization of traffic patterns, a network traffic model is proposed. A simulation study for network file system (NFS) traffic across a switched multi-megabit data service (SMDS) is conducted to apply the traffic model to SMDS access links in supporting high-performance applications in distributed systems over a wide area. The results show the high applicability of the model to traffic pattern reproduction and manipulation of performance studies. An alternative interval performance criterion is described to better specify the system performance at various time scales.<>
{"title":"Traffic pattern reproduction and manipulation for LAN-to-LAN SMDS experiments","authors":"Y.-D. Lin, S. Holmgren, C. Druce, F. James","doi":"10.1109/ICC.1992.267945","DOIUrl":"https://doi.org/10.1109/ICC.1992.267945","url":null,"abstract":"Motivated by the observations in the characterization of traffic patterns, a network traffic model is proposed. A simulation study for network file system (NFS) traffic across a switched multi-megabit data service (SMDS) is conducted to apply the traffic model to SMDS access links in supporting high-performance applications in distributed systems over a wide area. The results show the high applicability of the model to traffic pattern reproduction and manipulation of performance studies. An alternative interval performance criterion is described to better specify the system performance at various time scales.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125874256","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}
The authors consider the problem of change in traffic parameters of a connection in an asynchronous transfer mode (ATM) network and have found out that the traffic parameters of a connection may change appreciably along its path. They present a simulation-based study to examine the magnitude of this phenomenon. The experiments showed that, under certain circumstances, there may be a significant variation in traffic characteristics of a connection at different nodes along its path. Resource allocation must take this variation into account to ensure that quality of service requirements of different connections can be satisfied. A way to handle the problem would be to restore the original traffic pattern on the connection, either fully or partially, at each node along the path. A scheme is proposed to partially reconstruct the original traffic pattern, and its effectiveness was studied by means of simulation experiments.<>
{"title":"Variation of traffic parameters in ATM networks","authors":"Dinesh Verma, Domenico Ferrari","doi":"10.1109/ICC.1992.268195","DOIUrl":"https://doi.org/10.1109/ICC.1992.268195","url":null,"abstract":"The authors consider the problem of change in traffic parameters of a connection in an asynchronous transfer mode (ATM) network and have found out that the traffic parameters of a connection may change appreciably along its path. They present a simulation-based study to examine the magnitude of this phenomenon. The experiments showed that, under certain circumstances, there may be a significant variation in traffic characteristics of a connection at different nodes along its path. Resource allocation must take this variation into account to ensure that quality of service requirements of different connections can be satisfied. A way to handle the problem would be to restore the original traffic pattern on the connection, either fully or partially, at each node along the path. A scheme is proposed to partially reconstruct the original traffic pattern, and its effectiveness was studied by means of simulation experiments.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125835867","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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