International Symposium on Switching最新文献

{"title":"Integrated switching and transmission planning in exchange - carrier networks","authors":"R. J. Frank, J.H. Warkany, R.F. Rensing","doi":"10.1109/ISS.1990.765826","DOIUrl":"https://doi.org/10.1109/ISS.1990.765826","url":null,"abstract":"Telecommunications networks are faced with rapid techno logical change affecting virtually all aspects of network architecture, operations, services capabilities and survivability. Network planning for a graceful evolution from today's voice networks to tomorrow's intelligent networks requires a totally integrated planning approach which encompasses incremental technology changes in the various network elements, namely: switching, transmission; signalling and operations. Exchange carriers, in particular, need to rethink the historical concept of 'wire centers', and make decisions regarding the degree to which both switching logic and network fabric are distributed in tomorrow's broadband networks. This paper reviews some early analysis by Cincinnati Bell Telephone with respect to planning such network evolution. Many of the issues identified will also be faced by other exchange carriers or telecommunications administrations as new technology is introduced to support the intelligent networks of the future.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"25 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114031569","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}

{"title":"Development and introduction of services in the intelligent network of the deutsche bundespost","authors":"R. W. Slabon, H. Kaufer","doi":"10.1109/ISS.1990.765808","DOIUrl":"https://doi.org/10.1109/ISS.1990.765808","url":null,"abstract":"This article first describes several areas in which the today's services offer must be improved. Then it reports how the DBP has identified four services and a collection of service features for the near term service improvement and development. Finally a brief overview is given about the current special service network and its extention to a more Intelligent Network.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"10 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133070892","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}

{"title":"Distributed control for a high speed optical customer premises network","authors":"B. Aulia, P. Blankers, H. Mulder","doi":"10.1109/ISS.1990.765818","DOIUrl":"https://doi.org/10.1109/ISS.1990.765818","url":null,"abstract":"In this paper the development of a distributed control system for a wavelength and time-division multiplexed optical Customer Premises Network (CFN) is described. On the one side the constraints posed by the physical characteristics of the passive optical star network have been taken into account. On the other side the requirements arising from the applications are met. A third boundary condition is set by the ongoing international standardization of the B-ISDN. Means to cope with these boundary conditions are presented resulting in the design of a distributed equal peer control system which acts towards its environment as a B-ISDN NT2. The control system is based on the DSS1 protocol. It comprises the lower three OSI layers. The software has been specified in SDL. An outband control channel, based on fixed length cells is chosen. Quick channel setup and release times can be realized. The protocol provides the possibilities of logical addressing, user-user data transfer, privileges and bearer connection linking. With additional hardware, data channels with various bitrates can be switched, varying from 2.24 Mb/s up to the STM/sub 16/ payload capacity (2.4 Gb/s). The control system will be used in a demonstration CPN, which will be realized in 1991 as part of RACE project R1036. The initial application will be a television production environment, but the protocol is flexible enough to support a wide range of applications.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114210710","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}

{"title":"Ilt 2048: an integrated local and trunk digital switching system -a low budget development history","authors":"A. Udupa","doi":"10.1109/ISS.1990.765815","DOIUrl":"https://doi.org/10.1109/ISS.1990.765815","url":null,"abstract":"An Integrated Local and Trunk Digital Switching System with a capacity of 2048 ports for applications in the Secondary Switching Centres and below has been developed by R&D group of State-owned Indian Telephone Industries, Bangalore. This system has been developed with a remarkably low budget and this article describes the Development History and the System Archilecture.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130348273","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}

{"title":"Switch architecture for intelligent networks","authors":"F. Dolenc","doi":"10.1109/ISS.1990.765827","DOIUrl":"https://doi.org/10.1109/ISS.1990.765827","url":null,"abstract":"New functional requirements for future switching systems are demanding new approaches in system architecture toprovide new services on simple and economical base. System S12000 is in production for several years and about 1 million lines have been produced. S12000 is targeted into three major marketing segments: PABX, Private Networks and medium sized Local/Nodal CO application. In CO application it is specifically targeted into developing countries markets, where economy and simplicity is very important. Providing switching products for different application areas based on the same technology proved to be advantageous because of larger volume in limited marketing area. To provide smooth evolution into JSDN and IN networks, major architecture upgrade is proposed. This decision is based on conclusion, that switching systems are becoming similar to computer systems, where OEM technology can reduce cost. It has to utilize latest developments in computer and microelectronics field and standardization efforts in telecommunication community to provide as simple, flexible and economical solutions for products in its markets as possible. Compatibility with present switch hardware has to be kept to provide upgrade of existing customer base. Intelligent Network concepts are considered as very important for future networks. They are also used for internal system architecture therefore this architecture is named Intelligent Net work Architecture -INA.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127586895","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}

{"title":"An integrated access terminal for wideband packet networking: Design and performance overview","authors":"K. Sriram, G. A. Mariano, D. O. Bowker, W. Giguere","doi":"10.1109/ISS.1990.768701","DOIUrl":"https://doi.org/10.1109/ISS.1990.768701","url":null,"abstract":"In order to provide for more eficient means of handling the changing nee& of voice, data, and image trafic, ATdT has introduced the Integrated Access and Cross-connect System (IACS). This paper will focus on the design and performance of a component of the UCS. the Integrated Access Terminal (IAT) which performs the integration and packet multiplexing @nctions, and also provides circuit and packet cross-connect capabilities. Based on packet switching, proven digital signal pmcesn'ng techniques, and standard protocols, the U T extends packet switching of data to voice and to image, and provides a variety of techniques to optimize the use of bandwidth and the quality of service. Congestion control and bandwidth allocation are critical issues in the integration of diflerent troffic types. One of the congestion control schemes used in the U T is block dmpping on voice packets. The IATalso usesa dynamic bandwidth allocation scheme which efficiently integrates packetized voice and data traffic. This allocation scheme guarantees a certain bandwidth to both voice and data queues, and at the same time allows each queue to use any bandwidth momentarily unused in the other queue. We present results k e d on modeling and subjective listening tests of voice quality when subjected to block dropping in a network. The results show that excellent performance is achiewd in the IATfor both voice anddata. We demonsrate that packetized voice is technologically ideal for integration of services, and one can expect (at better than 4:1 compression ratios) a voice quality virtually indistinguishable from that of the best circuits in an existing digital network","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117277340","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}

{"title":"Service and resource identification in B-ISDN","authors":"B. Mobasser","doi":"10.1109/ISS.1990.768698","DOIUrl":"https://doi.org/10.1109/ISS.1990.768698","url":null,"abstract":"It was recognised early in the definition o fISDN services that there isa close link between the way services are statically defined and the way in which the related signalling protocols dynamically manipulate the various resource and service elements required for a call. This paper proposes to expand the at present limited set of definitions available in narrowband ISDN to 4 interrelated elements, allowing both the explicit identi cation of each element of the call and the decoupling between them. The purpose is to arrive at a clear definition of the distinct service and resource elements which have to be identified in the signalling protocols.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128417908","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}

{"title":"Formal design of communication protocols","authors":"H. Hansson, B. Jonsson, F. Orava, B. Pehrson","doi":"10.1109/ISS.1990.770113","DOIUrl":"https://doi.org/10.1109/ISS.1990.770113","url":null,"abstract":"We report partial results from a project aiming at defining guidelines for the specification and verification of communica tion protocols and services. A simple specification mediod is proposed. Using this technique we obtain verifiable specifications. These specifications can be used as the starting point for specification in description techniques, such as: LOTOS, Estelle, or SDL. Guidelines for specification and verification of communication protocols and services are given. It is argued that specifications should be expressed formally and that they should be well structured in order to facilitate verification, Examples of specification and verification are included.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126894185","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}

{"title":"The introduction of France Telecom's intelligent network","authors":"R. Kung, J. Martín, P. Collet, M. Lapierre","doi":"10.1109/ISS.1990.770122","DOIUrl":"https://doi.org/10.1109/ISS.1990.770122","url":null,"abstract":"The objective of this paper is twofold. firstly, it describes the overall architecture of FRANCE TELECOM's Intelligent Net work Secondly, it describes how it is being introduced. This architecture is based on two main service-independent functional entities: the 'Point de Commande des Servicesm (PCS) and the 'Commutateurd Accdaux Services'(CASorSSP)- The PCS performs the 'intelligent' part of the service as it knows both the service logic and the service data. The PCS may be part of a network node or outside the network in an intelligent node. The CAS function is always located in a network node, and is able to perform a list of elementary operations under the control of the PCS function. The other major elements are the INDB (intelligent network database), the Charging Centre, the Intelligent Peripheral and the signalling network. The intelligent node machine is sub divided in several parts: the PCS-R is the realtime machine (SCP); the PCS-G is the management machine (SMS); FRANCE TELECOM's commercial staff may directly access the PCS-G or via a front end machine called PCS-C; the PCS-D is used for the service creation environment. This approach is being introduced now for the PSTN and the ISDN. FRANCE TELECOM is also considering the use of this approach for its TELETEL videotex network, for its data network (TRANSPAQ and for its electronic directory network. Centralized services are being now provided with a 'preintelligent' network, A fully-fledged IN with its service environment will be introduced by 1991. The first services on this IN will be enhanced freephone, enhanced credit card and VPN.","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115993333","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}

{"title":"Advanced telephony-computing applications and services the new powerful dimension of ISDN PBXs","authors":"Karsten-H. Tuchnitz","doi":"10.1109/ISS.1990.768710","DOIUrl":"https://doi.org/10.1109/ISS.1990.768710","url":null,"abstract":"Time is a crucial factor in business and every possibility is investigated to speed up the daily work in oflces. For instance, dialing a phone number is a purely mechanical task, and there is no reason why this function should not be performed more eflciently by a computer program. The advent of ISDN PBXs establishes a new form of close cooperation between a PBX and a computer system. This allows advanced telephony-computing applications and services to control both switching and processing functions. The modern ISDN PBX Hicom (registered trademark) from Siemens fulfilLF the high market requirements for linking telephone handling andcomputer processing by offering capabilities for line integration, device integration anct/or fully functional application integration This superior level of integration is achieved by ISDN D-channel protocols and CSTA interfnces (Computer Supported Telephony Applications) being stanabrdized. Hicom enables computer programs to access and control a rich variety of its sewices andfunctions. The CSTA-like interconnection via Hicom 's Applications Connectivity Linksupports the implementation of any type of integrated voice-dota package, from simple software telephones to automatic call distribution, hotel applications, etc. Its use has been agreed upon with several leading computer vendors. This article shows the requirements for today's voice-data integration in ofices. describes the different approaches t o w a d thisgoal, outlinesthe Hicom fentunsandinterfaces for computer cooperation with emphask on the Applications Connectivity Link and gives examples of typical telephony -computing applications. (ISDN = IntegratedSewices Digital Network; PBX = Private Branch Exchange) 1. MARKET' REQUIREMENTS FOR PBX AND COMPUTER W I N G Today's Situation: Separate Devices for Telephoning and Computing Today's ofices arc still characterized by a variety of standalone deviees and systems often not interworking well with each other. Use of the telephone in most cases is not an integral part of the computer applications implemented to support office work (refer to Figure 1). Therefore, users of office systems often still have to operate the telephones individually by hand for the repeated business proceduns. Goal: Integrated Telephoning and Computing Users should be able to accomplish typical office functions with just OM uscr interface on just one terminal, even if the telephone equipment is a separate device on the desk. All neccssaw teleDhone actions should be S U D W I ~ C ~ asmuch as wssible client's name and other information to the clerk's terminal display to support further actions in response to what the client is ordering. This relieves the clerk from routine, time consuming and error prone tasks such as looking up telephone numbers, dialing the numbers, switching to handsfree talking, hanging up etc. Computer supported telephony lets the user complete tasks that are part of everyday office work together and in one step. Examp","PeriodicalId":277204,"journal":{"name":"International Symposium on Switching","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128446210","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}