GTE Telephone Operations (Telops) employs a vendor quality process which effectively builds strong customer/vendor partnerships focused on quality. The author discusses the vendor partnerships in quality. As a partner in quality, GTE asks its vendors to rate Telops as a customer. GTE wants to do what it can to become its vendors' customer of choice. This mutual drive for standards of excellence, through which high-quality, high-volume, long-term business relationships can emerge, is the definition of GTE/vendor partnership in quality. Results over the past few years illustrate the effectiveness of GTE Telops' approach to vendor and product quality.<>
{"title":"In pursuit of vendor quality excellence (telecommunication products)","authors":"J. Christensen","doi":"10.1109/ICC.1992.268139","DOIUrl":"https://doi.org/10.1109/ICC.1992.268139","url":null,"abstract":"GTE Telephone Operations (Telops) employs a vendor quality process which effectively builds strong customer/vendor partnerships focused on quality. The author discusses the vendor partnerships in quality. As a partner in quality, GTE asks its vendors to rate Telops as a customer. GTE wants to do what it can to become its vendors' customer of choice. This mutual drive for standards of excellence, through which high-quality, high-volume, long-term business relationships can emerge, is the definition of GTE/vendor partnership in quality. Results over the past few years illustrate the effectiveness of GTE Telops' approach to vendor and product quality.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"37 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":"115075841","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}
To understand the potential of indoor radio systems as communication media between portable computers and local area networks, the authors built a wideband indoor radio propagation measurement apparatus. The apparatus operates in the industrial, scientific, and medical (ISM) bands centered around 910 MHz, 2.44 GHz, and 5.8 GHz. They briefly describe the measurement apparatus, the measurement procedures, and the measurement areas in an academic environment, Columbia University. Complex multipath delay profiles were recorded in classrooms, small-room offices, open-layout offices, an auditorium, a library, and a machine room. The effects of both delay spread and channel dynamics on designing a high-speed indoor radio data transmission scheme are also discussed.<>
{"title":"Delay spreads and channel dynamics measurements at ISM bands","authors":"C.-C. Huang, R. Khayata","doi":"10.1109/ICC.1992.268046","DOIUrl":"https://doi.org/10.1109/ICC.1992.268046","url":null,"abstract":"To understand the potential of indoor radio systems as communication media between portable computers and local area networks, the authors built a wideband indoor radio propagation measurement apparatus. The apparatus operates in the industrial, scientific, and medical (ISM) bands centered around 910 MHz, 2.44 GHz, and 5.8 GHz. They briefly describe the measurement apparatus, the measurement procedures, and the measurement areas in an academic environment, Columbia University. Complex multipath delay profiles were recorded in classrooms, small-room offices, open-layout offices, an auditorium, a library, and a machine room. The effects of both delay spread and channel dynamics on designing a high-speed indoor radio data transmission scheme are also discussed.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"55 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":"116198032","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}
Photonic bus networks (PBNets) consist of a linear multihop structure interconnected in a dual unidirectional bus virtual topology using point-to-point optical channels. An analytic model is adapted for predicting the individual station delay of a PBNet where additional receivers have been assigned using the algorithms given by Todd et al. (1991). It has been found that the model works exceedingly well under all the cases considered. The success of the model is attributed to the fact that receiver allocation tends to reduce correlations in the flow of packets along the bus. As a result, the independence assumptions used in the model are more realistic.<>
{"title":"Receiver allocation in photonic bus networks","authors":"T. D. Todd, S. Sivakumaran","doi":"10.1109/ICC.1992.268000","DOIUrl":"https://doi.org/10.1109/ICC.1992.268000","url":null,"abstract":"Photonic bus networks (PBNets) consist of a linear multihop structure interconnected in a dual unidirectional bus virtual topology using point-to-point optical channels. An analytic model is adapted for predicting the individual station delay of a PBNet where additional receivers have been assigned using the algorithms given by Todd et al. (1991). It has been found that the model works exceedingly well under all the cases considered. The success of the model is attributed to the fact that receiver allocation tends to reduce correlations in the flow of packets along the bus. As a result, the independence assumptions used in the model are more realistic.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"36 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":"124479190","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 address key issues involved in data link control in a wavelength-division-multiple-access (WDMA) optical star network. A comparison is made between regulating data traffic from a central controller and at the individual distributed stations. The particular transmission format considered is one in which data are carried on a baseband signal and control information is carried on a multiplexed subcarrier, thereby providing a transparent data link without requiring a second optical control channel. It is shown that central control will relax the hardware and cost requirements of each station's receiver as well as reduce the time delay in setting up a call. The specific hardware advantages for each individual station's optoelectronic receiver when implementing a central control algorithm include a reduction in the required bandwidth and number of optical and RF filters.<>
{"title":"Comparison of central and distributed control in a WDMA star network","authors":"A. Willner, M. Maeda, J. Wullert","doi":"10.1109/ICC.1992.268169","DOIUrl":"https://doi.org/10.1109/ICC.1992.268169","url":null,"abstract":"The authors address key issues involved in data link control in a wavelength-division-multiple-access (WDMA) optical star network. A comparison is made between regulating data traffic from a central controller and at the individual distributed stations. The particular transmission format considered is one in which data are carried on a baseband signal and control information is carried on a multiplexed subcarrier, thereby providing a transparent data link without requiring a second optical control channel. It is shown that central control will relax the hardware and cost requirements of each station's receiver as well as reduce the time delay in setting up a call. The specific hardware advantages for each individual station's optoelectronic receiver when implementing a central control algorithm include a reduction in the required bandwidth and number of optical and RF filters.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"116 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":"129410100","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 deal with the feasibility of a guaranteed bandwidth transport service (GBTS) on shuffle multihop networks (SMHNs). A simple resource allocation protocol, allowing a high flexibility in bandwidth allocation, is proposed. A performance study is carried out to verify the response of the SMHNs to GB traffic. In particular, the path blocking probability is evaluated by means of an analytical model in the cases of balanced and unbalanced loads. A comparison with the performance of similar LAN/MAN structures, i.e., simple ring and ring with spatial reuse, is carried out. A methodology to manage the resources to make the grade of service independent of the physical location of the network nodes is proposed and its impact on the network performance is evaluated. Some considerations on its actual implementation are presented.<>
{"title":"Efficiency and fairness issues in multihop networks supporting a guaranteed bandwidth transport service","authors":"F. Bernabei, L. Gratta, M. Listanti","doi":"10.1109/ICC.1992.268260","DOIUrl":"https://doi.org/10.1109/ICC.1992.268260","url":null,"abstract":"The authors deal with the feasibility of a guaranteed bandwidth transport service (GBTS) on shuffle multihop networks (SMHNs). A simple resource allocation protocol, allowing a high flexibility in bandwidth allocation, is proposed. A performance study is carried out to verify the response of the SMHNs to GB traffic. In particular, the path blocking probability is evaluated by means of an analytical model in the cases of balanced and unbalanced loads. A comparison with the performance of similar LAN/MAN structures, i.e., simple ring and ring with spatial reuse, is carried out. A methodology to manage the resources to make the grade of service independent of the physical location of the network nodes is proposed and its impact on the network performance is evaluated. Some considerations on its actual implementation are presented.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"25 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":"129412500","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 timing tracking synchronizer structure for pi /2-BPSK (binary phase shift keying) and pi /4-QPSK (quadrature PSK) is presented and evaluated for various channel conditions. The timing tracking synchronizer is based on the nonlinear spectral line method where the received signal is passed through a nonlinearity to generate discrete spectral components related to the symbol rate. The synchronizer then makes judicious use of this timing information. The authors discuss the principle of operation and point out the practical aspects of its implementation. Estimates of the timing jitter variance are obtained through simulation for several channel conditions typical of mobile-satellite communications. It is shown that the performance is insensitive to the amplitude nonlinearity of the transmitter amplifier. Results show also that the timing synchronizer can make efficient use of the multipath energy in a flat-fading channel.<>
{"title":"A new symbol timing tracking algorithm for pi /2-BPSK and pi /4-QPSK modulations","authors":"F. Petenaude, M. Moher","doi":"10.1109/ICC.1992.268024","DOIUrl":"https://doi.org/10.1109/ICC.1992.268024","url":null,"abstract":"A timing tracking synchronizer structure for pi /2-BPSK (binary phase shift keying) and pi /4-QPSK (quadrature PSK) is presented and evaluated for various channel conditions. The timing tracking synchronizer is based on the nonlinear spectral line method where the received signal is passed through a nonlinearity to generate discrete spectral components related to the symbol rate. The synchronizer then makes judicious use of this timing information. The authors discuss the principle of operation and point out the practical aspects of its implementation. Estimates of the timing jitter variance are obtained through simulation for several channel conditions typical of mobile-satellite communications. It is shown that the performance is insensitive to the amplitude nonlinearity of the transmitter amplifier. Results show also that the timing synchronizer can make efficient use of the multipath energy in a flat-fading channel.<<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":"129525610","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 focus on the problem of internodal link queueing in integrated fast packet networks. The queueing discipline used to multiplex packets onto an internodal link is an important element in the overall bandwidth management of an integrated fast packet network. The characteristics of and quality of service required by different traffic classes are reviewed and used as the basis for comparing alternative queueing disciplines. A hybrid weighted round-robin and head-of-line priority discipline are shown to provide appropriate allocation of the internodal link bandwidth among different traffic classes, while allowing decay differentiation within a traffic class.<>
{"title":"Queueing disciplines for integrated fast packet networks","authors":"M. Hluchyj, A. Bhargava","doi":"10.1109/ICC.1992.268064","DOIUrl":"https://doi.org/10.1109/ICC.1992.268064","url":null,"abstract":"The authors focus on the problem of internodal link queueing in integrated fast packet networks. The queueing discipline used to multiplex packets onto an internodal link is an important element in the overall bandwidth management of an integrated fast packet network. The characteristics of and quality of service required by different traffic classes are reviewed and used as the basis for comparing alternative queueing disciplines. A hybrid weighted round-robin and head-of-line priority discipline are shown to provide appropriate allocation of the internodal link bandwidth among different traffic classes, while allowing decay differentiation within a traffic class.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"33 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":"128336509","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}
It is argued that, to keep pace with ever-changing needs for new services capabilities and increased bandwidth, local exchange carriers (LECs) need to deploy a flexible and robust access infrastructure. The use of outside plant electronics such as digital loop carrier (DLC) and lightwave multiplexers, either stand-alone or integrated, to implement remote service interfaces and a high-bandwidth fiber feeder can achieve this goal. To insure flexibility, the DLC and lightwave multiplexer equipment should support full service capability and bandwidth management of the DS0 and DS1/VT1.5 (Virtual Tributary 1.5) level. On the distribution side, the platform should support copper, fiber, and wireless access. On the feeder side, use of standard interfaces such as TR303 and SONET are crucial in implementing a high-functionality network that supports advanced operations, administration, maintenance, and provisioning, as well as multivendor interworking.<>
{"title":"Flexibility and quality in the access network","authors":"T. Kilm, T. Nantz","doi":"10.1109/ICC.1992.267948","DOIUrl":"https://doi.org/10.1109/ICC.1992.267948","url":null,"abstract":"It is argued that, to keep pace with ever-changing needs for new services capabilities and increased bandwidth, local exchange carriers (LECs) need to deploy a flexible and robust access infrastructure. The use of outside plant electronics such as digital loop carrier (DLC) and lightwave multiplexers, either stand-alone or integrated, to implement remote service interfaces and a high-bandwidth fiber feeder can achieve this goal. To insure flexibility, the DLC and lightwave multiplexer equipment should support full service capability and bandwidth management of the DS0 and DS1/VT1.5 (Virtual Tributary 1.5) level. On the distribution side, the platform should support copper, fiber, and wireless access. On the feeder side, use of standard interfaces such as TR303 and SONET are crucial in implementing a high-functionality network that supports advanced operations, administration, maintenance, and provisioning, as well as multivendor interworking.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"283 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":"127491080","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 frequency reuse technique can be adopted for doubling the capacity (bits/hertz) of digital radio systems. The newly developed 140-Mb/s 32QAM (quadrature amplitude modulation) Telettra modems equipped with a cross polar interference canceller (XPIC) have been tested successfully on a 60-km 4-GHz link in the north of Italy. The authors present the main results observed during the period of August-December 1991. The performance of a 2*140 Mb/s 32QAM system is comparable to that of a 1*140 Mb/s 16QAM system in the same conditions. The good XPIC performance in terms of outage probability reduction and sync-recovering speed shows the soundness of design and construction technologies.<>
{"title":"140 Mbit/s 32QAM cross-polarized co-frequency trial results","authors":"U. Casiraghi, L. Saini, P. Vitali","doi":"10.1109/ICC.1992.267993","DOIUrl":"https://doi.org/10.1109/ICC.1992.267993","url":null,"abstract":"The frequency reuse technique can be adopted for doubling the capacity (bits/hertz) of digital radio systems. The newly developed 140-Mb/s 32QAM (quadrature amplitude modulation) Telettra modems equipped with a cross polar interference canceller (XPIC) have been tested successfully on a 60-km 4-GHz link in the north of Italy. The authors present the main results observed during the period of August-December 1991. The performance of a 2*140 Mb/s 32QAM system is comparable to that of a 1*140 Mb/s 16QAM system in the same conditions. The good XPIC performance in terms of outage probability reduction and sync-recovering speed shows the soundness of design and construction technologies.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"60 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":"130169214","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}
Transmission scheduling strategies are considered for a packet-switched, low-altitude, multiple-satellite system. Each satellite directs its receive antenna at particular neighboring satellites at times governed by a pseudorandom sequence, agreed upon in advance between each receive/transmit pair. During periods when a satellite is not in receive mode it must schedule its transmissions to neighboring satellites. Each packet must be sent at such a time that at time of arrival the intended receiver antenna is directed at the source satellite. The performance of a simple nonpreemptive scheduling strategy is assessed. Scheduling strategies yielding the maximum weighted throughput are then identified and compared to the simple scheduling strategy. An adaptive control policy is introduced. In the special case that there are only two neighboring satellites, the adaptive strategy provides stability at all data rates for which stability is possible under any nonlookahead strategy.<>
{"title":"Crosslink transmission scheduling in multiple satellite systems with pseudo-random potential receive times","authors":"M. Carr, B. Hajek","doi":"10.1109/ICC.1992.268055","DOIUrl":"https://doi.org/10.1109/ICC.1992.268055","url":null,"abstract":"Transmission scheduling strategies are considered for a packet-switched, low-altitude, multiple-satellite system. Each satellite directs its receive antenna at particular neighboring satellites at times governed by a pseudorandom sequence, agreed upon in advance between each receive/transmit pair. During periods when a satellite is not in receive mode it must schedule its transmissions to neighboring satellites. Each packet must be sent at such a time that at time of arrival the intended receiver antenna is directed at the source satellite. The performance of a simple nonpreemptive scheduling strategy is assessed. Scheduling strategies yielding the maximum weighted throughput are then identified and compared to the simple scheduling strategy. An adaptive control policy is introduced. In the special case that there are only two neighboring satellites, the adaptive strategy provides stability at all data rates for which stability is possible under any nonlookahead strategy.<<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":"126944834","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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