C. Demartini, P. Montuschi, A. Valenzano, L. Ciminiera, R. Sisto
A study of the throughput and time characteristics of double-ring networks is presented, assuming that the two channels are used for balancing the traffic (when both are working) and for synchronous traffic generated according to a generic but periodic pattern. In addition, reconfiguration using portions of both rings to circumvent faulty elements in a double ring network is shown to be equivalent to the single ring configuration already studied. Examples of applications of the results are also illustrated.<>
{"title":"Throughput analysis of timed token protocols in double ring networks","authors":"C. Demartini, P. Montuschi, A. Valenzano, L. Ciminiera, R. Sisto","doi":"10.1109/LCN.1992.228154","DOIUrl":"https://doi.org/10.1109/LCN.1992.228154","url":null,"abstract":"A study of the throughput and time characteristics of double-ring networks is presented, assuming that the two channels are used for balancing the traffic (when both are working) and for synchronous traffic generated according to a generic but periodic pattern. In addition, reconfiguration using portions of both rings to circumvent faulty elements in a double ring network is shown to be equivalent to the single ring configuration already studied. Examples of applications of the results are also illustrated.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114526202","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}
An analysis of potential parallelism in TCP/IP is presented for two purposes. First, it is used as a basis for an implementation on a multiprocessing platform. Second, it reveals the areas where protocol modifications and/or tuning would yield more efficient implementations on multiprocessors. The focus is on the analysis, and detailed dependence graphs among the atomic TCP/IP protocol functions are presented. No specific implementation design is shown, since this highly depends on the particular hardware chosen.<>
{"title":"Analysis of TCP/IP for high performance parallel implementations","authors":"O. Koufopavlou, A. Tantawy, M. Zitterbart","doi":"10.1109/LCN.1992.228141","DOIUrl":"https://doi.org/10.1109/LCN.1992.228141","url":null,"abstract":"An analysis of potential parallelism in TCP/IP is presented for two purposes. First, it is used as a basis for an implementation on a multiprocessing platform. Second, it reveals the areas where protocol modifications and/or tuning would yield more efficient implementations on multiprocessors. The focus is on the analysis, and detailed dependence graphs among the atomic TCP/IP protocol functions are presented. No specific implementation design is shown, since this highly depends on the particular hardware chosen.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125846461","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 800-Mb HIPPI data channel has been defined by ANSI X3T9.3 for the purpose of connecting supercomputers, large-scale peripheral systems, high-performance workstations, and network layer routers. In addition to being a capable point-to-point medium, the HIPPI standard permits traffic to be routed through a series of intermediate crossbar switches, similar to telephone switching technology. The presence of crossbar switches requires a technique to control the selection of intermediate trunks between systems. An implementation of link state routing algorithms that can be practically used in this environment is described. The algorithms used take advantage of the fact that paths cannot be reentered as data progress from source to destination and are not directly applicable to many upcoming switching technologies such as ATM. However, they are applicable to such items as automated video and PBX switching systems, where peer-to-peer connectivity between switching systems is preferred over a highly administered hierarchy of switches.<>
{"title":"A link state routing algorithm for the configuration of interconnected HIPPI switches","authors":"K. Hardwick, J. Halpern, W. Franta","doi":"10.1109/LCN.1992.228112","DOIUrl":"https://doi.org/10.1109/LCN.1992.228112","url":null,"abstract":"The 800-Mb HIPPI data channel has been defined by ANSI X3T9.3 for the purpose of connecting supercomputers, large-scale peripheral systems, high-performance workstations, and network layer routers. In addition to being a capable point-to-point medium, the HIPPI standard permits traffic to be routed through a series of intermediate crossbar switches, similar to telephone switching technology. The presence of crossbar switches requires a technique to control the selection of intermediate trunks between systems. An implementation of link state routing algorithms that can be practically used in this environment is described. The algorithms used take advantage of the fact that paths cannot be reentered as data progress from source to destination and are not directly applicable to many upcoming switching technologies such as ATM. However, they are applicable to such items as automated video and PBX switching systems, where peer-to-peer connectivity between switching systems is preferred over a highly administered hierarchy of switches.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124767947","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}
An exact queuing model for a station that operates within the IEEE 802.6 subnetwork of a metropolitan area network (MAN) is developed. The model reflects the station's perception of the subnetwork and it has been developed by mapping the media access control (MAC) protocol to a queuing service discipline. The model is a discrete-time single-server queue with two classes of customers served according to a quasi-gated discipline. The one class of customers represents the data packets generated by the station, while the other class represents the requests registered by the station. The model gives useful insight into the operation of the station and it can be used as a cornerstone module for analytical and/or simulation models of the whole IEEE 802.6 subnetwork.<>
{"title":"A queueing model for a data station within the IEEE 802.6 MAN","authors":"C. Bisdikian","doi":"10.1109/LCN.1992.228174","DOIUrl":"https://doi.org/10.1109/LCN.1992.228174","url":null,"abstract":"An exact queuing model for a station that operates within the IEEE 802.6 subnetwork of a metropolitan area network (MAN) is developed. The model reflects the station's perception of the subnetwork and it has been developed by mapping the media access control (MAC) protocol to a queuing service discipline. The model is a discrete-time single-server queue with two classes of customers served according to a quasi-gated discipline. The one class of customers represents the data packets generated by the station, while the other class represents the requests registered by the station. The model gives useful insight into the operation of the station and it can be used as a cornerstone module for analytical and/or simulation models of the whole IEEE 802.6 subnetwork.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121340947","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}
SMDS, a switched multimegabit data service that addresses metropolitan area network (MAN) and wide-area network (WAN) solutions, is discussed. A trial network and the results of its testing are described.<>
{"title":"3M/US West SMDS trial","authors":"J. Bumblis","doi":"10.1109/LCN.1992.228122","DOIUrl":"https://doi.org/10.1109/LCN.1992.228122","url":null,"abstract":"SMDS, a switched multimegabit data service that addresses metropolitan area network (MAN) and wide-area network (WAN) solutions, is discussed. A trial network and the results of its testing are described.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116718145","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 traffic generated by a class of graphics-intensive X Window System applications is characterized, and the effects the hardware processing platform has on the characteristics of the generated traffic are studied. The effect of running graphics-intensive applications on network performance is examined, and the network capabilities and limitations are determined. The experimental results show that the communications requirements of graphics-intensive applications are very high. Moreover, these requirements may depend on the processing power of the hardware platform that runs these applications.<>
{"title":"Performance and traffic characterization of a class of graphics-intensive X-applications","authors":"K. Khalil","doi":"10.1109/LCN.1992.228158","DOIUrl":"https://doi.org/10.1109/LCN.1992.228158","url":null,"abstract":"The traffic generated by a class of graphics-intensive X Window System applications is characterized, and the effects the hardware processing platform has on the characteristics of the generated traffic are studied. The effect of running graphics-intensive applications on network performance is examined, and the network capabilities and limitations are determined. The experimental results show that the communications requirements of graphics-intensive applications are very high. Moreover, these requirements may depend on the processing power of the hardware platform that runs these applications.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125253687","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 bandwidth allocation scheme for the distributed-queue dual-bus (DQDB) network, the adaptive threshold algorithm (ATA), is proposed. The ATA mechanism is able to prevent with short response time any saturation or any underload of the network. The medium capacity is fairly shared between active nodes by keeping permanently the network global load under a given threshold. By means of simulation results, the performances of ATA and of bandwidth balancing are compared in terms of response time and of medium utilization ratio.<>
{"title":"The adaptive threshold algorithm: a bandwidth allocation mechanism with fast response time for DQDB","authors":"M. Gagnaire, B. Gadet","doi":"10.1109/LCN.1992.228171","DOIUrl":"https://doi.org/10.1109/LCN.1992.228171","url":null,"abstract":"A bandwidth allocation scheme for the distributed-queue dual-bus (DQDB) network, the adaptive threshold algorithm (ATA), is proposed. The ATA mechanism is able to prevent with short response time any saturation or any underload of the network. The medium capacity is fairly shared between active nodes by keeping permanently the network global load under a given threshold. By means of simulation results, the performances of ATA and of bandwidth balancing are compared in terms of response time and of medium utilization ratio.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122884710","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 switched multi-megabit data service (SMDS) is a high-performance, public, packet-switched data service. Offered as public network equivalent of a MAC-level service, the datagram transport offered by SMDS is easily integrated into networking protocol architectures using local area network (LAN) or metropolitan area network (MAN) technologies such as Ethernet and fiber distributed data interface (FDDI). A customer network management (CNM) service has been defined in conjunction with SMDS, based on SNMP. SMDS and the accompanying CNM service were successfully demonstrated. These demonstrations and how SMDS and its CNM service can be integrated into existing corporate networks are discussed.<>
{"title":"Practical SMDS demonstrations","authors":"T.B. Jennings, J.C. Lawrence, K. Tesink","doi":"10.1109/LCN.1992.228119","DOIUrl":"https://doi.org/10.1109/LCN.1992.228119","url":null,"abstract":"The switched multi-megabit data service (SMDS) is a high-performance, public, packet-switched data service. Offered as public network equivalent of a MAC-level service, the datagram transport offered by SMDS is easily integrated into networking protocol architectures using local area network (LAN) or metropolitan area network (MAN) technologies such as Ethernet and fiber distributed data interface (FDDI). A customer network management (CNM) service has been defined in conjunction with SMDS, based on SNMP. SMDS and the accompanying CNM service were successfully demonstrated. These demonstrations and how SMDS and its CNM service can be integrated into existing corporate networks are discussed.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123052901","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}
M. J. Betancor, Jacinto Martín, J. Rivero, V. M. Melián, F. J. Gabiola, F. J. López-Hernández
The design of an IEEE-488.2 (GPIB) system which uses a wireless infrared link is presented. The wireless link provided mobility into laboratories where GPIB instrumentation is used. The data transmission is by serial link. This type of system presents some advantages over conventional cable systems. Besides, when IRED is used, the radiation is negligible for the users and harmless. The optoelectrical GPIB interface uses commercial IREDs and photodiodes.<>
{"title":"IEEE-488.2 communications by infrared wireless link","authors":"M. J. Betancor, Jacinto Martín, J. Rivero, V. M. Melián, F. J. Gabiola, F. J. López-Hernández","doi":"10.1109/LCN.1992.228151","DOIUrl":"https://doi.org/10.1109/LCN.1992.228151","url":null,"abstract":"The design of an IEEE-488.2 (GPIB) system which uses a wireless infrared link is presented. The wireless link provided mobility into laboratories where GPIB instrumentation is used. The data transmission is by serial link. This type of system presents some advantages over conventional cable systems. Besides, when IRED is used, the radiation is negligible for the users and harmless. The optoelectrical GPIB interface uses commercial IREDs and photodiodes.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132762418","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 work presented is a case study of the application on the FieldBus protocol to motor cars. The problem of the management of traffic made up of the various actuation and control signals present in a car is addressed, and criteria for allocation of the available bandwidth and assessing the behavior of the FieldBus in various traffic conditions are discussed. The results obtained show that, in the particular case considered, the FieldBus proved to be perfectly capable of meeting the communication requirements of car control systems.<>
{"title":"A car control system exploiting FieldBus DLL protocol features","authors":"S. Cavalieri, A. Stefano, O. Mirabella","doi":"10.1109/LCN.1992.228138","DOIUrl":"https://doi.org/10.1109/LCN.1992.228138","url":null,"abstract":"The work presented is a case study of the application on the FieldBus protocol to motor cars. The problem of the management of traffic made up of the various actuation and control signals present in a car is addressed, and criteria for allocation of the available bandwidth and assessing the behavior of the FieldBus in various traffic conditions are discussed. The results obtained show that, in the particular case considered, the FieldBus proved to be perfectly capable of meeting the communication requirements of car control systems.<<ETX>>","PeriodicalId":249184,"journal":{"name":"[1992] Proceedings 17th Conference on Local Computer Networks","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121699468","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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