Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188367
X. Chen, I. Leslie
The authors present an adaptive control scheme based on neural networks to solve a general quality-of-service (QOS) control problem in broadband ATM (asynchronous transfer mode) networks. The control algorithms developed for training neural networks are a direct application of the error backpropagation learning method with those modifications required to pose the problem in a QOS control framework. To illustrate the present scheme's ability to control, examples of dynamic models are studied through simulations.<>
{"title":"A neural network approach towards adaptive congestion control in broadband ATM networks","authors":"X. Chen, I. Leslie","doi":"10.1109/GLOCOM.1991.188367","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188367","url":null,"abstract":"The authors present an adaptive control scheme based on neural networks to solve a general quality-of-service (QOS) control problem in broadband ATM (asynchronous transfer mode) networks. The control algorithms developed for training neural networks are a direct application of the error backpropagation learning method with those modifications required to pose the problem in a QOS control framework. To illustrate the present scheme's ability to control, examples of dynamic models are studied through simulations.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121087055","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188418
Chii-Min Loau, Ji-Tsu Wu
A novel DPLL (digital phase-locked loop) has been designed and implemented. A novel phase locking technique called phase-hopping was developed. Key features of the phase-hopping DPLL (PHDPLL) are high-speed desynchronization and very narrow bandwidth (below 1 Hz). Moreover, it can be integrated with other operation circuits on a single chip by VLSI technology. Loop characteristics of the PHDPLL have been analyzed and verified by software simulation and hardware test. The optimal parameters and performance of the PHDPLL for SONET (Synchronous Optical NETwork) desynchronizer applications are presented. When the loop bandwidth of the PHDPLL is below 0.66 Hz, it is observed that the desynchronizer's output jitter meets the 1.5 unit interval peak-to-peak jitter specification.<>
{"title":"PHDPLL for SONET desynchronizer","authors":"Chii-Min Loau, Ji-Tsu Wu","doi":"10.1109/GLOCOM.1991.188418","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188418","url":null,"abstract":"A novel DPLL (digital phase-locked loop) has been designed and implemented. A novel phase locking technique called phase-hopping was developed. Key features of the phase-hopping DPLL (PHDPLL) are high-speed desynchronization and very narrow bandwidth (below 1 Hz). Moreover, it can be integrated with other operation circuits on a single chip by VLSI technology. Loop characteristics of the PHDPLL have been analyzed and verified by software simulation and hardware test. The optimal parameters and performance of the PHDPLL for SONET (Synchronous Optical NETwork) desynchronizer applications are presented. When the loop bandwidth of the PHDPLL is below 0.66 Hz, it is observed that the desynchronizer's output jitter meets the 1.5 unit interval peak-to-peak jitter specification.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121299224","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188425
T. Ohtsuki, H. Yashima, I. Sasase, S. Mori
The authors propose parallel rate-variable punctured convolutional coded PPM (pulse position modulation) in a photon counting channel to achieve high energy information efficiency for desired bit error rate (BER) and transmission bandwidth. Theoretical results are shown for the BER performance, the bandwidth expansion factor beta , and a necessary energy information efficiency to achieve BER=10/sup -6/ of the proposed systems for some combinations of code rates. It is found that the system with the same code rates on all binary erasure channels has better BER performance than other systems for the same bandwidth expansion factor beta . It is also found that the proposed system can achieve high energy information efficiency for desired BER and beta by selecting a suitable combination of code rates depending on the channel conditions. Moreover, it is shown that the proposed system has better BER performance than Reed-Solomon-coded PPM in a small range of beta .<>
{"title":"Parallel rate-variable coded PPM in photon counting channel","authors":"T. Ohtsuki, H. Yashima, I. Sasase, S. Mori","doi":"10.1109/GLOCOM.1991.188425","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188425","url":null,"abstract":"The authors propose parallel rate-variable punctured convolutional coded PPM (pulse position modulation) in a photon counting channel to achieve high energy information efficiency for desired bit error rate (BER) and transmission bandwidth. Theoretical results are shown for the BER performance, the bandwidth expansion factor beta , and a necessary energy information efficiency to achieve BER=10/sup -6/ of the proposed systems for some combinations of code rates. It is found that the system with the same code rates on all binary erasure channels has better BER performance than other systems for the same bandwidth expansion factor beta . It is also found that the proposed system can achieve high energy information efficiency for desired BER and beta by selecting a suitable combination of code rates depending on the channel conditions. Moreover, it is shown that the proposed system has better BER performance than Reed-Solomon-coded PPM in a small range of beta .<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116416651","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188637
R. Gidron, A. Acampora
Design and implementation issues for large distributed asynchronous transfer mode (ATM) switching systems are considered. The ATM switch fabric resides in small, geographically dispersed access stations interconnected by a shared, all-optical medium carrying many wavelength-multiplexed channels. The authors present the architecture of the distributed ATM fabric and describe the optical subsystem. They summarize the per-port throughput relative to the dimensionality of the distributed switching elements contained in the access station, and discuss design considerations relative to the dimensionality of the switching element. The detailed design of an access station, or network interface unit (NIU), and its associated subsystems, implemented as part of the ACORN/TeraNet project, are presented.<>
{"title":"Design and implementation of a distributed switching node for a multihop ATM network","authors":"R. Gidron, A. Acampora","doi":"10.1109/GLOCOM.1991.188637","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188637","url":null,"abstract":"Design and implementation issues for large distributed asynchronous transfer mode (ATM) switching systems are considered. The ATM switch fabric resides in small, geographically dispersed access stations interconnected by a shared, all-optical medium carrying many wavelength-multiplexed channels. The authors present the architecture of the distributed ATM fabric and describe the optical subsystem. They summarize the per-port throughput relative to the dimensionality of the distributed switching elements contained in the access station, and discuss design considerations relative to the dimensionality of the switching element. The detailed design of an access station, or network interface unit (NIU), and its associated subsystems, implemented as part of the ACORN/TeraNet project, are presented.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116432000","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188449
L. Bickers, I. Cade, K. James, S. James
The proposal of new network architectures for the access network, such as TPON (telephony over a passive optical network), led to the study of ways in which the new architecture can be integrated into existing systems. A testbed designed to explore the integration issues is described. Emphasis is placed on the operational experience gained using the testbed. The key objectives of the testbed were to determine the optimum operations and maintenance (O&M) procedures to allow the introduction of TPON systems into BT's existing O&M architecture; to identify the network management requirements; and to gain an improved understanding of the wider implications for mass deployment of fiber in the loop. The design of the testbed involved a passive optical network, a head-end multiplexer, and a remote-end multiplexer. The O&M development process of iterating procedure definition, prototyping, experimentation, and evaluation has proven successful in helping to define the optimum O&M procedures and tools.<>
{"title":"Operations and maintenance experimental testbed for a business TPON system","authors":"L. Bickers, I. Cade, K. James, S. James","doi":"10.1109/GLOCOM.1991.188449","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188449","url":null,"abstract":"The proposal of new network architectures for the access network, such as TPON (telephony over a passive optical network), led to the study of ways in which the new architecture can be integrated into existing systems. A testbed designed to explore the integration issues is described. Emphasis is placed on the operational experience gained using the testbed. The key objectives of the testbed were to determine the optimum operations and maintenance (O&M) procedures to allow the introduction of TPON systems into BT's existing O&M architecture; to identify the network management requirements; and to gain an improved understanding of the wider implications for mass deployment of fiber in the loop. The design of the testbed involved a passive optical network, a head-end multiplexer, and a remote-end multiplexer. The O&M development process of iterating procedure definition, prototyping, experimentation, and evaluation has proven successful in helping to define the optimum O&M procedures and tools.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124036375","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188617
S. Konidaris
The European Commission has launched the RACE programme (Research and Development in Advanced Communications in Europe) as a key element of the European telecommunications policy. Through cooperation around joint R and D projects, the main parties (telecommunications operators, industry, service providers, users, etc.) define and share the objectives for the use of advanced telecommunications networks and services for 1995 and beyond. The status of the programme and its future orientation are presented.<>
{"title":"The RACE programme-research for advanced communications in Europe","authors":"S. Konidaris","doi":"10.1109/GLOCOM.1991.188617","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188617","url":null,"abstract":"The European Commission has launched the RACE programme (Research and Development in Advanced Communications in Europe) as a key element of the European telecommunications policy. Through cooperation around joint R and D projects, the main parties (telecommunications operators, industry, service providers, users, etc.) define and share the objectives for the use of advanced telecommunications networks and services for 1995 and beyond. The status of the programme and its future orientation are presented.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129183170","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188358
Yawpo Yang, S. Soliman
The authors report a novel moments-based classifier to classify MPSK (M-ary phase shift keying) signals by using the moments of the phase utilizing the exact phase distribution. When compared with a case in which the Tikhonov function is used to approximate the asymptotic distribution of the phase, the new classifier with 1024 samples offered a 2 dB improvement. The 2 dB improvement is offered when the probability of misclassification is 0.01. Furthermore, improvement in performance can be obtained by increasing the length of the observation interval.<>
{"title":"Statistical moments based classifier for MPSK signals","authors":"Yawpo Yang, S. Soliman","doi":"10.1109/GLOCOM.1991.188358","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188358","url":null,"abstract":"The authors report a novel moments-based classifier to classify MPSK (M-ary phase shift keying) signals by using the moments of the phase utilizing the exact phase distribution. When compared with a case in which the Tikhonov function is used to approximate the asymptotic distribution of the phase, the new classifier with 1024 samples offered a 2 dB improvement. The 2 dB improvement is offered when the probability of misclassification is 0.01. Furthermore, improvement in performance can be obtained by increasing the length of the observation interval.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127328847","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188605
R. Shear, E. von Greyerz
In an effort to improve quality, the AG Communication Systems Corporation (AGCS) refined its product development methodology to ensure that accurate requirements are defined and customer expectations are met in developing releases of its GTD-5 EAX digital telephone switching system. For the latest release under development, a customer review process was integrated into the developmental methodology as an additional means of integrating customer input throughout the product development. The goals of the review process, the format of the presentations and specific results from the use of customer reviews in the development of the latest AGCS GTD-5 EAX release are discussed.<>
{"title":"Meeting changing customer expectations by integrating customer reviews into the development process (telecommunication equipment)","authors":"R. Shear, E. von Greyerz","doi":"10.1109/GLOCOM.1991.188605","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188605","url":null,"abstract":"In an effort to improve quality, the AG Communication Systems Corporation (AGCS) refined its product development methodology to ensure that accurate requirements are defined and customer expectations are met in developing releases of its GTD-5 EAX digital telephone switching system. For the latest release under development, a customer review process was integrated into the developmental methodology as an additional means of integrating customer input throughout the product development. The goals of the review process, the format of the presentations and specific results from the use of customer reviews in the development of the latest AGCS GTD-5 EAX release are discussed.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117177078","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188468
S.L. Hardt-Kornacki, L. Ness
The delivery of multimedia information over future public networks may require sophisticated control facilities. In order both to minimize segment delivery latencies and to maximize network utilization, the delivery control facility must preallocate and release network resources based on dynamic models of both the interactive multimedia document and the network topology. It is shown that, by expressing these models as labeled access graphs that incorporate the relevant statistics, the algorithm for optimized delivery can be specified by a small set of rules. An optimization mechanism that utilizes the algorithm is described, and how it should obtain its input parameters and how it should be executed are specified. The practical validity of the mechanism is discussed for a group of services which includes video-on-demand and interactive electronic magazines.<>
{"title":"Optimization model for the delivery of interactive multimedia documents","authors":"S.L. Hardt-Kornacki, L. Ness","doi":"10.1109/GLOCOM.1991.188468","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188468","url":null,"abstract":"The delivery of multimedia information over future public networks may require sophisticated control facilities. In order both to minimize segment delivery latencies and to maximize network utilization, the delivery control facility must preallocate and release network resources based on dynamic models of both the interactive multimedia document and the network topology. It is shown that, by expressing these models as labeled access graphs that incorporate the relevant statistics, the algorithm for optimized delivery can be specified by a small set of rules. An optimization mechanism that utilizes the algorithm is described, and how it should obtain its input parameters and how it should be executed are specified. The practical validity of the mechanism is discussed for a group of services which includes video-on-demand and interactive electronic magazines.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131392046","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188524
H. J. Chao, D. Kong, N. Cheung, M. Arnould, H. T. Kung
A scheme is proposed to convert the data formats between the HIPPI (high performance parallel interface) and ATM (asynchronous transfer mode) protocols. A possible method of implementing the HIPPI broadband terminal adaptor (HIPPI-BTA), which interfaces multiple HIPPI channels to the SONET (synchronous optical network)/ATM network, is also presented. A preliminary study indicated that the HIPPI interface of the high performance computer hosts and the SONET/ATM standards of the future broadband communication networks have a high potential to work well with each other.<>
{"title":"Transport of gigabit/sec data packets over SONET/ATM networks","authors":"H. J. Chao, D. Kong, N. Cheung, M. Arnould, H. T. Kung","doi":"10.1109/GLOCOM.1991.188524","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188524","url":null,"abstract":"A scheme is proposed to convert the data formats between the HIPPI (high performance parallel interface) and ATM (asynchronous transfer mode) protocols. A possible method of implementing the HIPPI broadband terminal adaptor (HIPPI-BTA), which interfaces multiple HIPPI channels to the SONET (synchronous optical network)/ATM network, is also presented. A preliminary study indicated that the HIPPI interface of the high performance computer hosts and the SONET/ATM standards of the future broadband communication networks have a high potential to work well with each other.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132637652","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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