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A new approach for enhancing the throughput capability of a synchronous bus LAN 一种提高同步总线局域网吞吐量的新方法
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175606
N. Kuroyanagi
{"title":"A new approach for enhancing the throughput capability of a synchronous bus LAN","authors":"N. Kuroyanagi","doi":"10.1109/ITS.1990.175606","DOIUrl":"https://doi.org/10.1109/ITS.1990.175606","url":null,"abstract":"An original media access protocol called CAST (counting access to synchronous time slots) is proposed. This protocol can be implemented over a synchronous bus local area network (LAN). CAST uses a simple algorithm by which each station can recognize its turn of access by counting either the number of data packets or the number of idle pulses sent from all preceding stations. The throughput versus transfer time performance of a CAST LAN is better than that of other LANs, and it can be verified by performance analysis. Other useful features are an integrated voice and data capability, a high-connection portability, and reliability. A hardware model is also discussed.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127052777","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}
引用次数: 1
On the design of a high performance ATM metropolitan area network 高性能ATM城域网的设计
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175656
A. Baiocchi, L. Gratta, M. Listanti, A. Roveri, R. Winkler
{"title":"On the design of a high performance ATM metropolitan area network","authors":"A. Baiocchi, L. Gratta, M. Listanti, A. Roveri, R. Winkler","doi":"10.1109/ITS.1990.175656","DOIUrl":"https://doi.org/10.1109/ITS.1990.175656","url":null,"abstract":"Some aspects of the design of high-performance ATM (asynchronous transfer mode)-compatible MANs (metropolitan area networks) are discussed. In particular, throughput and fairness parameters are examined. As far as fairness is concerned, a merit figure is proposed, and an evaluation procedure is presented. A general approach to cope with the above-mentioned aspects is discussed and, as a proposed solution, a MAC protocol, called adaptive cycle cell insertion (ACCI), is described. The results of a performance evaluation study of the ACCI protocol are compared with those relevant to the current version of the IEEE standard 802.6.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125289400","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}
引用次数: 3
An architecture and implementation for an FDDI MAC concentrator FDDI MAC集中器的体系结构和实现
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175608
A. Ruiz, R. Montalvo, J. Brunheroto, W.R. Friedrich, J. Nogima
{"title":"An architecture and implementation for an FDDI MAC concentrator","authors":"A. Ruiz, R. Montalvo, J. Brunheroto, W.R. Friedrich, J. Nogima","doi":"10.1109/ITS.1990.175608","DOIUrl":"https://doi.org/10.1109/ITS.1990.175608","url":null,"abstract":"The authors present an architecture and implementation for an FDDI (fiber distributed data interface) concentrator with media access control (MAC) sublayer support. The architecture calls for a distributed implementation of the SMT CMT (station management connection management) for the concentrator. The main features include microcontroller-based physical connection management, configuration management, and link error monitor for the back-end and front-end PHYs. Other features include a node-processor-based entity coordination management, ring management, MAC support, SMT frame transaction support, and link layer control. Communication, between the node processor and the peripheral microcontrollers is two-way serial for high-speed support of concentrator management transactions between the physical entities and the node processor. The architecture is modular because the microcontroller-based management allows for local intelligence for a group of back-end physical entities.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122337307","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}
引用次数: 0
FEC coding for RH/MFSK multiple-access spread spectrum systems RH/MFSK多址扩频系统的FEC编码
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175611
U. Fiebig
{"title":"FEC coding for RH/MFSK multiple-access spread spectrum systems","authors":"U. Fiebig","doi":"10.1109/ITS.1990.175611","DOIUrl":"https://doi.org/10.1109/ITS.1990.175611","url":null,"abstract":"Forward error control (FEC) coding for frequency-hopping multiple frequency shift keying (FH/MFSK) multiple-access systems is analyzed, taking into account synchronous as well as asynchronous other-user interference. For both cases capacity and cut-off-rate are investigated and exact expressions for the basic system parameters are derived. Various types of FEC codes are considered. Systems employing repetition coding (diversity) or dual-k codes are examined as well as concatenated coding schemes with various outer RS codes. For the most promising codes the required E/sub b//N/sub 0/ as a function of the number of active system users is calculated.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122852129","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}
引用次数: 1
Control aspects of a TDMA system for passive optical networks 无源光网络TDMA系统的控制方面
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175568
D. Clarke, M. A. Hale, J.B. Chuter
{"title":"Control aspects of a TDMA system for passive optical networks","authors":"D. Clarke, M. A. Hale, J.B. Chuter","doi":"10.1109/ITS.1990.175568","DOIUrl":"https://doi.org/10.1109/ITS.1990.175568","url":null,"abstract":"The authors describe a time-division multiple-access (TDMA) system developed at British Telecom Research Laboratories for telephony over passive optical networks (TPON). The system is called the TPON Bit Transport System (BTS). A bit-interleaved technique coupled with efficient control protocols facilitates the design of reliable, low-complexity, and low-power-consumption TPON hardware at both head-end and remote node. The BTS subsystem for the remote node has been successfully integrated in two ASIC (application-specific integrated circuit) devices and the BTS head-end supporting up to 128 nodes is contained within a compact plug-in module. The main elements of the embedded BTS control system for implementing and supervising an actively ranged bit-interleaved TDMA protocol are described.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122137478","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}
引用次数: 1
Real-time automatic speech recognition using HMM and neural networks 基于HMM和神经网络的实时自动语音识别
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175597
Y. Arriola, Rolando Carrasco
{"title":"Real-time automatic speech recognition using HMM and neural networks","authors":"Y. Arriola, Rolando Carrasco","doi":"10.1109/ITS.1990.175597","DOIUrl":"https://doi.org/10.1109/ITS.1990.175597","url":null,"abstract":"The authors describe the implementation of an automatic speech recognition system for isolated words, based on the integration of neural networks (NN) for phonetic mapping with hidden Markov models (HMMs) for word modeling. The main system features and implementation algorithms are presented, and initial experimental results and software capabilities are shown. It is shown that the inclusion of the NN model between the acoustic processor and the HMM improves the recognition and avoids the clustering and labelling phases.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128428640","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}
引用次数: 2
Hierarchical image coding with pyramid DPCM 基于金字塔DPCM的分层图像编码
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175666
R. D. de Queiroz, J.B.T. Yabu-uti
{"title":"Hierarchical image coding with pyramid DPCM","authors":"R. D. de Queiroz, J.B.T. Yabu-uti","doi":"10.1109/ITS.1990.175666","DOIUrl":"https://doi.org/10.1109/ITS.1990.175666","url":null,"abstract":"The authors apply DPCM (differential pulse code modulation) to pyramid coding strategy, and show that, for practical quantizers, lower bit rates than regular DPCM are required for high-quality resulting images. The pyramid DPCM is relatively simple, feasible, and allows a processing interval between samples that is longer than the sampling interval. A blockwise scheme for multiresolution which could largely decrease the coding bit rate is also discussed.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123389323","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}
引用次数: 2
Bandwidth management at integrated network nodes: adaptive policies for optimal access control of circuit-switched traffic 集成网络节点的带宽管理:电路交换流量最优访问控制的自适应策略
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175626
G. Meempat, M.K. Sundareshan
{"title":"Bandwidth management at integrated network nodes: adaptive policies for optimal access control of circuit-switched traffic","authors":"G. Meempat, M.K. Sundareshan","doi":"10.1109/ITS.1990.175626","DOIUrl":"https://doi.org/10.1109/ITS.1990.175626","url":null,"abstract":"The problem of adaptively managing the transmission bandwidth of the links of an integrated network by implementing optimal policies for access control of circuit-switched traffic is studied. Precise formulation within an optimization framework of the access control problem is developed. For the general problem of a multiplexer supporting traffic with different bandwidth requirements, a mixed integer programming formulation is developed and an efficient solution procedure is identified. A detailed quantitative evaluation of this access control procedure is conducted under different loading conditions, and it is shown that the present scheme yields superior performance characteristics compared to other known procedures.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128146457","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}
引用次数: 0
Operations support systems in Italy: experiences and perspectives of integration 意大利的运营支持系统:整合的经验和观点
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175669
M. Giannelli, S. Pileri, R. Saracco, P. Tiribelli
{"title":"Operations support systems in Italy: experiences and perspectives of integration","authors":"M. Giannelli, S. Pileri, R. Saracco, P. Tiribelli","doi":"10.1109/ITS.1990.175669","DOIUrl":"https://doi.org/10.1109/ITS.1990.175669","url":null,"abstract":"The progressive integration of telecommunication networks and services requires a parallel integration of administration operation maintenance and provisioning (AOM&P) activities. Integrated AOM&P support has to be defined with a top-down approach, while the implementation of the integration plan should follow a bottom-up approach. The telecommunication management network (TMN) architecture could provide for a suitable support to this evolution towards the final target, allowing the progressive interconnection of existing and new operations support systems (OSS). The Italian Operating Telephone Company, SIP, has adopted these concepts in defining plans and programs for evolving from the present situation-where a number of dedicated OSS are mechanizing several AOM&P functions-towards an integrated OSS environment to provide for more flexibility, higher quality, and reduced company costs. The support systems SIP has developed so far to operate and manage the telephone network are discussed, and already initiated programs directed towards the development of an integrated system complying with the TMN architecture are described.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115926831","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}
引用次数: 2
Investigation on vector quantized multipulse excitation with fixed pattern of positions 位置固定模式矢量量化多脉冲激励研究
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175596
J. S. Yamamoto, F. Violaro
{"title":"Investigation on vector quantized multipulse excitation with fixed pattern of positions","authors":"J. S. Yamamoto, F. Violaro","doi":"10.1109/ITS.1990.175596","DOIUrl":"https://doi.org/10.1109/ITS.1990.175596","url":null,"abstract":"The authors consider speech coding based on the vector quantization of the multipulse excitation with a fixed pattern of positions (MPE-FPP). Since in this type of excitation signal the positions of the pulses are known, a codebook can be easily obtained by applying the vector quantization design technique directly to a training sequence of the multipulse excitation generated by a conventional multipulse linear prediction (MPE-LPC) speech coder with restrictions on the pulse positions. Informal listening tests have shown that the vector quantized multipulse excitation with fixed pattern of positions (VQMPE-FPP) is very efficient in producing natural-sounding speech at a bit rate as low as 6.7-7.1 kbit/s.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132520490","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}
引用次数: 0
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