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ISDN-ISUP interworking-a critical view ISDN-ISUP联动——批判观点
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175627
Marcus Maranhao
{"title":"ISDN-ISUP interworking-a critical view","authors":"Marcus Maranhao","doi":"10.1109/ITS.1990.175627","DOIUrl":"https://doi.org/10.1109/ITS.1990.175627","url":null,"abstract":"It is pointed out that the interworking between the ISDN (integrated services digital network) user-network interface layer 3 protocol and the SS7-ISUP (ISDN user part) protocol is not straightforward, in spite of the fact that ISUP was developed to support ISDN. Three basic criteria for designing two protocols, such that their interworking is simplified, are presented, and it is shown that the ISDN-ISUP interworking does not follow these criteria.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"499 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":"123063508","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
Efficient sampling rate conversion with cubic splines 有效的三次样条采样率转换
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175643
J. de Carvalho, J. Hanson
{"title":"Efficient sampling rate conversion with cubic splines","authors":"J. de Carvalho, J. Hanson","doi":"10.1109/ITS.1990.175643","DOIUrl":"https://doi.org/10.1109/ITS.1990.175643","url":null,"abstract":"An efficient implementation of a two-stage fractional sampling rate conversion for digital audio signals is presented, based on: local cubic spline interpolation. The first (up-converter) stage is computationally optimal, using polyphase networks. The second (down-converter) stage generally requires coefficient calculations for each sample, but is also efficient because of the local nature of the cubic spline interpolation.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"32 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":"129823418","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: 5
On the performance of a packet switch with twin optical transmitters 双光发射机分组交换机的性能研究
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175570
G. Albertengo
{"title":"On the performance of a packet switch with twin optical transmitters","authors":"G. Albertengo","doi":"10.1109/ITS.1990.175570","DOIUrl":"https://doi.org/10.1109/ITS.1990.175570","url":null,"abstract":"A packet switch based on electrooptical technologies is presented. It is composed of N VLSI chips which interface the input and output links with the internal optical interconnection network. Its simulation, when loaded with homogeneous input and output traffic, showed that two packets at a time must be first extracted from each input buffer and then transmitted on the optical interconnection network to achieve an almost optimal performance. This significantly affects both the architecture of the VLSI chips and the optical transmission scheme.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"2001 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":"131361517","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
Effect of channel distortions in the performance of digital transmission systems with QAM modulation 信道畸变对QAM调制数字传输系统性能的影响
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175616
W. S. Moreira, J. Brandão
{"title":"Effect of channel distortions in the performance of digital transmission systems with QAM modulation","authors":"W. S. Moreira, J. Brandão","doi":"10.1109/ITS.1990.175616","DOIUrl":"https://doi.org/10.1109/ITS.1990.175616","url":null,"abstract":"Analytical expressions for mean square and peak values of the intersymbol interference in QAM (quadrature amplitude modulation) digital transmission systems with some particular channel transfer functions are derived. Linear, quadratic, cubic, and sinusoidal channel amplitude responses are considered. Performance degradation curves corresponding to these distortions are obtained using a computer program for analysis and simulation of digital transmission systems. Results of performance degradation for 16-QAM and 64-QAM modulation systems are presented. For small distortion levels it is also shown that the obtained analytical results can provide a simple approximation for the performance degradation.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"26 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":"130197392","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
The design of multiplierless digital data transmission filters with powers-of-two coefficients 二次幂系数无乘法器数字数据传输滤波器的设计
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175640
H. Samueli
{"title":"The design of multiplierless digital data transmission filters with powers-of-two coefficients","authors":"H. Samueli","doi":"10.1109/ITS.1990.175640","DOIUrl":"https://doi.org/10.1109/ITS.1990.175640","url":null,"abstract":"An efficient search technique is presented for the design of FIR (finite impulse response) digital transmit and receive matched filters whose coefficients are represented by sums and/or differences of powers-of-two. These filters are ideally suited for custom VLSI implementation since power-of-two multipliers are obtained for free in a dedicated hardware implementation. Thus only a few adders or subtracters are required for each tap of the filter, and therefore fairly high-order filters can be implemented on a single VLSI chip. Due to their very simple structure these multiplierless filters could potentially operate at very high sampling rates to accommodate baud rates in the microwave digital radio range.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"60 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120993995","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: 30
A satellite LAN interconnecting system 卫星局域网互连系统
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175633
K. Kobayashi, J. Namiki, A. Kanemasa, R. Saga, K. Watanabe
{"title":"A satellite LAN interconnecting system","authors":"K. Kobayashi, J. Namiki, A. Kanemasa, R. Saga, K. Watanabe","doi":"10.1109/ITS.1990.175633","DOIUrl":"https://doi.org/10.1109/ITS.1990.175633","url":null,"abstract":"The authors propose a satellite LAN (local area network) interconnecting architecture which makes full use of satellite benefits and counteracts satellite demerits. The architecture provides high-quality data transmission and high performance for satellite bit errors by using a connection-oriented satellite protocol which can establish multiple logical links between two nodes. As a protocol conversion method, router-type interconnection was selected to guard against problems such as broadcast 'storms'. Based on this architecture, a satellite LAN interconnecting system which includes a 3.6 m antenna with a 2 W transceiver, a satellite modem, and the new Satellite Node Processor has been developed. The system can support high-speed transmission rates of up to 768 kb/s and superior network management.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"7 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":"126704076","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
Bandwidth management for connectionless services in a B-ISDN environment B-ISDN环境中无连接业务的带宽管理
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175651
S. Sistla, B. Materna, M. Petrukm, I.E. Gort
{"title":"Bandwidth management for connectionless services in a B-ISDN environment","authors":"S. Sistla, B. Materna, M. Petrukm, I.E. Gort","doi":"10.1109/ITS.1990.175651","DOIUrl":"https://doi.org/10.1109/ITS.1990.175651","url":null,"abstract":"A bandwidth management strategy for connectionless services is described. The intelligent network (IN) that will play an important role in B-ISDN (broadband integrated services digital network) evolution was selected as the optimal platform for implementation of the selected bandwidth control scheme. A fast and flexible virtual path network based on fiber optical spread spectrum multiple access (FOSSMA), supporting bandwidth management within the IN, is proposed.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"46 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":"128977618","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
Digital group demodulation systems for multiple QPSK carriers 多QPSK载波数字群解调系统
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175631
I.R. Corden, R. Carrasco
{"title":"Digital group demodulation systems for multiple QPSK carriers","authors":"I.R. Corden, R. Carrasco","doi":"10.1109/ITS.1990.175631","DOIUrl":"https://doi.org/10.1109/ITS.1990.175631","url":null,"abstract":"A novel complex-input-complex-output transmultiplexer (TMUX) algorithm is derived with application to quadrature modulation schemes for use in the area of satellite onboard processing. The proposed approach exploits an inherent property of the all-zero lattice filters whereby two reverse polynomial all-zero filters are simultaneously derived. This property is coupled to a similar property requirement of the linear phase prototype filter-based doubly odd transform-polyphase filter TMUX, and the resulting computational load is analyzed for the European study concerning multiple carrier demodulation (MCD) equipment. The lattice subfilter algorithm offers a more robust solution to the transmultiplexer implementation than does the transversal scheme when fixed point digital signal processing is applied.<<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":"132774505","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
Survey of unified switching techniques for integrated-service networks 综合业务网统一交换技术综述
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175624
T. T. Bradley, T. Suda
{"title":"Survey of unified switching techniques for integrated-service networks","authors":"T. T. Bradley, T. Suda","doi":"10.1109/ITS.1990.175624","DOIUrl":"https://doi.org/10.1109/ITS.1990.175624","url":null,"abstract":"The authors survey proposals for future integrated-service networks, with emphasis on unified approaches which employ a single switching technique across the entire network bandwidth. It is noted that the two most promising unified approaches are burst and fast packet switching. Burst switching is a circuit switching-based approach which allocates channel bandwidth to a connection only during the transmission of bursts of information. Fast packet switching is a packet switching-based approach which can be characterized by very high transmission rates on network links and simple, hardwired protocols which match the high bandwidth of the network. Both approaches are proposed as possible implementations for integrated-service networks. The authors also briefly examine N-ISDN (narrowband integrated services digital network), and discuss the key performance issues found in fast packet switching.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"119 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":"133993386","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
Voice conference switching in digital telephone exchanges 数字电话交换机中的语音会议交换
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175587
H. Kinoshita, L. H. Caricatto, V.A.V. Diaz
{"title":"Voice conference switching in digital telephone exchanges","authors":"H. Kinoshita, L. H. Caricatto, V.A.V. Diaz","doi":"10.1109/ITS.1990.175587","DOIUrl":"https://doi.org/10.1109/ITS.1990.175587","url":null,"abstract":"The authors present several algorithms which could be used to perform conference connections in a digital telephone exchange, including a newly proposed algorithm. These algorithms are analyzed from both the performance and implementation points of view. Finally, the implementation of the conference switching function in TROPICO-RA, the Brazilian medium/large telephone exchange, is described. The conference circuit designed for the TROPICO was tested with conference groups involving up to six speakers and yielded satisfactory results.<<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":"127661619","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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