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}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188560
A. Khandani, P. Kabal, H. Leib
The idea of combined shaping and coding of a signal constellation over a multitone channel is introduced. Two joint optimization methods, partly integer, for distributing the rate and the energy are introduced. In the first method, the minimum distance to noise ratio (protection) along all the dimensions is the same. The proposed method maximizes this protection. In the second method, this restriction is relaxed. The second method outperforms the first. As part of the calculations, a closed-form formula has been found for the weight distribution of the scaled E/sub 8/ lattice.<>
{"title":"Combined coding and shaping over a multitone channel","authors":"A. Khandani, P. Kabal, H. Leib","doi":"10.1109/GLOCOM.1991.188560","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188560","url":null,"abstract":"The idea of combined shaping and coding of a signal constellation over a multitone channel is introduced. Two joint optimization methods, partly integer, for distributing the rate and the energy are introduced. In the first method, the minimum distance to noise ratio (protection) along all the dimensions is the same. The proposed method maximizes this protection. In the second method, this restriction is relaxed. The second method outperforms the first. As part of the calculations, a closed-form formula has been found for the weight distribution of the scaled E/sub 8/ lattice.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"77 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":"132987676","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.1991.188367
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.1991.188605
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.1991.188442
A. Afrashteh, D. Chukurov
The authors present the performance of an experimental TDMA (time division multiple access) portable radio link with a switching single loop frequency synthesizer. The synthesizer, used as a local oscillator (LO), operates around 2 GHz with a 400 kHz step size and can switch over 20 MHz in less than 400 mu s. Performance of the TDMA radio link using WER (word error ratio) as a criterion was measured with the synthesizer switching frequencies between bursts at the transmitter. WER versus SNR (signal-to-noise ratio) shows small degradation, only 0.5 dB at WER of 10/sup -3/, due to the phase noise of the synthesizer signal. The phase noise values for an offset of 10 kHz and 100 kHz were -70 dBc/Hz and -90 dBc/Hz, respectively. Measurements indicated that the radio link performance showed only minor degradation when the synthesizer was switched 20 MHz only 400 mu s before transmitting a data burst. This permits a handset to switch to different channels than the channel of operation to measure signal quality for possible call-transfer once every 2 ms frame.<>
{"title":"Performance of a TDMA portable radio link with a switching frequency synthesizer","authors":"A. Afrashteh, D. Chukurov","doi":"10.1109/GLOCOM.1991.188442","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188442","url":null,"abstract":"The authors present the performance of an experimental TDMA (time division multiple access) portable radio link with a switching single loop frequency synthesizer. The synthesizer, used as a local oscillator (LO), operates around 2 GHz with a 400 kHz step size and can switch over 20 MHz in less than 400 mu s. Performance of the TDMA radio link using WER (word error ratio) as a criterion was measured with the synthesizer switching frequencies between bursts at the transmitter. WER versus SNR (signal-to-noise ratio) shows small degradation, only 0.5 dB at WER of 10/sup -3/, due to the phase noise of the synthesizer signal. The phase noise values for an offset of 10 kHz and 100 kHz were -70 dBc/Hz and -90 dBc/Hz, respectively. Measurements indicated that the radio link performance showed only minor degradation when the synthesizer was switched 20 MHz only 400 mu s before transmitting a data burst. This permits a handset to switch to different channels than the channel of operation to measure signal quality for possible call-transfer once every 2 ms frame.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"40 2 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":"120988767","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.1991.188650
A. Nakamura, T. Tanaka, H. Uesaka
The authors discuss the hardware architecture for the service control point (SCP). They show the network architecture for the intelligent network (IN) which is the basis of the discussion. Functions required for the SCP are classified into three types. Requirements for the SCP hardware architecture are clarified. On a certain SCP model satisfying the requirements, where a single SCP consists of multiple modules and module types, it is shown that on designing the performance of the SCP, there exists a solution giving the minimum cost of SCP, and a method is outlined to obtain this solution. Some examples are given to show the effectiveness of the method.<>
{"title":"SCP architecture with performance flexibility","authors":"A. Nakamura, T. Tanaka, H. Uesaka","doi":"10.1109/GLOCOM.1991.188650","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188650","url":null,"abstract":"The authors discuss the hardware architecture for the service control point (SCP). They show the network architecture for the intelligent network (IN) which is the basis of the discussion. Functions required for the SCP are classified into three types. Requirements for the SCP hardware architecture are clarified. On a certain SCP model satisfying the requirements, where a single SCP consists of multiple modules and module types, it is shown that on designing the performance of the SCP, there exists a solution giving the minimum cost of SCP, and a method is outlined to obtain this solution. Some examples are given to show the effectiveness of the method.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"29 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":"115277115","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.1991.188734
Chang-jia Chen, Tai-yi Chen
DC-free runlength-limited codes are studied. Their finite state sequential machine is defined and the achievable rate region is discussed. For the code construction aspect, two general rules are proposed as follows: (1) Always leave suitable redundancy when using the output word which is false in decreasing the running digital sum (RDS) in the absolute value. (2) If state splitting is inevitable, then first try to split the states with small n-l (where n and l are the accumulated RDS and encoding delay, respectively) and with large delay l. By using these rules, several DC-free (d,k) codes are constructed. It is shown that, by following the general rules, the trial work can be substantially reduced.<>
{"title":"DC free runlength-limited codes","authors":"Chang-jia Chen, Tai-yi Chen","doi":"10.1109/GLOCOM.1991.188734","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188734","url":null,"abstract":"DC-free runlength-limited codes are studied. Their finite state sequential machine is defined and the achievable rate region is discussed. For the code construction aspect, two general rules are proposed as follows: (1) Always leave suitable redundancy when using the output word which is false in decreasing the running digital sum (RDS) in the absolute value. (2) If state splitting is inevitable, then first try to split the states with small n-l (where n and l are the accumulated RDS and encoding delay, respectively) and with large delay l. By using these rules, several DC-free (d,k) codes are constructed. It is shown that, by following the general rules, the trial work can be substantially reduced.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"52 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":"116138462","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.1991.188589
K. Krishnan
An overview is presented of some of the papers on traffic routing presented at the 13th International Teletraffic Congress in Copenhagen, Denmark, in June 1991.<>
{"title":"Dynamic traffic routing and network management","authors":"K. Krishnan","doi":"10.1109/GLOCOM.1991.188589","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188589","url":null,"abstract":"An overview is presented of some of the papers on traffic routing presented at the 13th International Teletraffic Congress in Copenhagen, Denmark, in June 1991.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"63 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":"116731961","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}
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