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Subscriber Loops and Services, 1988. Proceedings, ISSLS 88., International Symposium on

Date 11-16 Sept. 1988

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Displaying Results 1 - 25 of 58
  • ISSLS 88: The International Symposium on Subscriber Loops and Services. Proceedings (Cat. No.88CH2536-1)

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    Freely Available from IEEE
  • Evaluation of the ISDN market in France

    Page(s): 66 - 69
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    The authors present the commercial strategy for introducing ISDN in France. This strategy is based on the favorable technical elements of the French network, and on the past experience of Videotex and Transpac. Market studies appear to be helpful in determining this strategy. This strategy consists of four actions: reducing the cost of terminals; having attractive tariffs; creating a special sales force; and developing partnership for applications.<> View full abstract»

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  • Fiber to the home experience in Southern Bell

    Page(s): 208 - 212
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    Southern Bell is in the process of deploying fiber to the home of Heathrow, a residential and business development in central Florida. The Heathrow fiber access system transports voice, data, and video (CATV) services over single-mode fiber to each home. A description is given of the Heathrow program organization, the market development of residential services, the initial cut-over experience, and Southern Bell's plan for provisioning fiber in the last mile of the distribution plant View full abstract»

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  • Service analysis for the customers premises network

    Page(s): 103 - 107
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    A service analysis is presented for three classes of customers' premises network environments: the residential (home), medium-office, and large-office environments. The service analysis includes audio and video broadcast services and has to be seen in the time frame 1995-2000. High-definition television has not been taken into account. The analysis is based on the Erlang theory and as such is only an approximation, but gives a good idea of the service requirements from the customers' point of view. After introduction of the proposed architecture for the customers' premises network, interface payload requirements are derived for the terminal and network interfaces View full abstract»

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  • Fibre optics for loop applications: a techno-economical analysis

    Page(s): 213 - 216
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    The suitability of different technologies for low-cost implementation of a fiber-optic subscriber line with bit rates between 150 and 600 Mb/s is investigated. Bidirectional transmission on one single-mode fiber using wavelength-division multiplexing, lasers, p-i-n diodes, and silicon LSI circuits is found to be the best choice for a modular subscriber line that will meet future requirements. Although this proposed link design will mature over the years, cost predictions from lightsource/detector and LSI circuit manufacturers indicate that it may be possible to reach LSI-chip prices of some dollars. The optoelectric components will still cost around $100 to $200, but the cost will decrease rapidly with increasing production volume. This link design will therefore be appropriate both for feeder and overlay network in the introduction phase of fiber in the loop, as well as for the connection of all subscribers to a complete B-ISDN system View full abstract»

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  • Service opportunities for fiber to the home

    Page(s): 14 - 18
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    The deployment of fiber in the local loop in combination with broadband switching facilities will enable a wealth of new services to be offered to the residential customer from an arbitrary large number of competing service providers. Several of the service concepts are outlined, and possible local exchange carrier strategies for addressing the switched broadband opportunity are discussed. Switched broadband is not likely to displace cable television. On the contrary, one scenario for the cable operator would be to deliver the basic cable channels via existing cable directly to cable-ready TVs, and to provide the premium channels via the switched broadband network. This would eliminate the need for scrambling while providing a higher quality signal. Since these premium channels would be switched, they would be totally immune to theft, and could be offered on a pay-per-view basis View full abstract»

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  • ISDN, initial results: lessons for tomorrow

    Page(s): 202 - 207
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    ISDN opened in France at the end of 1987 with the connection of some fifty professionals and businesses. The service is being extended rapidly. The authors give the results that have been obtained from this operation in its development phase as well as the first months of operation. They focus on the main successes and/or problems that will define the extension and development of ISDN in the coming years View full abstract»

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  • An optimal investment strategy model for fiber to the home

    Page(s): 149 - 155
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    A modeling approach is demonstrated for selecting an optimal investment strategy, over time, for deploying optical fiber in the local loop. The analysis proceeds in three steps. First, the authors forecast cost trends for the key components of a residential fiber network over a 20-year time horizon. Second, an engineering planning model calculates the total cost of providing broadband services using various technologies, for each level of component costs. Third, a dynamic programming model determines the optimal time to deploy fiber-based technology, given component cost trends and revenue forecasts. This approach allows the authors to examine when to begin installing residential fiber networks, and whether some investments should be deferred in order to incorporate future technologies. A description is given of the broadband network architectures evaluated in the study. The authors describe their procedure for determining the optimal investment scenario over time. They review the component cost and other assumptions underlying their scenarios. They present results of their analysis View full abstract»

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  • A new transport network architecture based on asynchronous transfer mode techniques

    Page(s): 217 - 221
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    The authors explore an information transport network architecture based on ATM (asynchronous transfer mode) techniques. ATM-based networks, when coupled with recent technological innovations, are expected to open the way to credible solutions to the problem of constructing universal transport networks. Multiplexing and transport aspects of ATM have a great impact on network architectures because of their flexibility and capability to meet virtually any service demand. A philosophy is presented of a future transport network architecture in which the ATM's capabilities will be exploited to construct an efficient and economical network. Important concepts in implementing the network are: introducing service-independent basic transport mechanisms; simplification of the network architecture by implementing the virtual path concept; providing highly distributed functions in a subscriber access network; and developing a universal interface. Based on these considerations, a model network is also proposed View full abstract»

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  • The 2B1Q line code for the local loop: genesis and transceiver implementation

    Page(s): 19 - 23
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    The genesis of the 2B1Q line code for ISDN basic rate access over metallic pair local loops is described. The reasons why 2B1Q was chosen for the emerging American National Standards Institute (ANSI) interface standard are outlined and the impact of the standard specification on transmission performance and the implementation complexity of transceivers is discussed. 2B1Q provides excellent performance with potentially low complexity of implementation View full abstract»

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  • Economic considerations of fiber in the loop plant

    Page(s): 291 - 296
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    Determines when fiber in the distribution network will be at economic parity with copper, what the sensitivities are, and how the prospect of fiber distribution will affect near-term planning of the digital loop carrier (DLC) on fiber versus copper in the feeder network. Based on nominal assumptions for declining fiber system costs and maintenance savings, fiber would be at parity with copper in the year 1992. Under more conservative fiber cost trend rates and with no maintenance savings, the parity point would shift to the year 1995, with the cost trend rate assumptions having the largest impact. In feeder planning, it was found that DLC on fiber is the economic choice over copper for feeder lengths greater than approximately 8000 ft, if the distribution area is to be converted to fiber in the early 1990s View full abstract»

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  • Transporting new high-speed services in access networks

    Page(s): 165 - 168
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    Current application studies indicate than an emerging customer demand for high-speed services will impose additional requirements on the way telecommunication operating companies plan and implement the network. The authors identify a number of promising services, review the economic and strategic drivers for such services, and examine the requirements imposed by these services on access planning and the future access network. They conclude that these services can be best supported by a network based on the new Exchange Carrier Standards Association T1X1 SONET standard View full abstract»

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  • The McDonald's ISDN trial: a test case for telecommunication evolution

    Page(s): 80 - 84
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    The current ISDN trial at McDonald's is the culmination of a teamwork effort amongst AT&T, Illinois Bell Telephone (IBT), McDonald's, and several suppliers of customer premise equipment. McDonald's selected an ISDN solution because ISDN provided an architectural blueprint on which the corporation could base its long-term strategic telecommunications direction. The author highlights and summarizes: McDonald's ISDN trial experiences; McDonald's future ISDN plans; and McDonald's perspective on issues facing the ISDN industry View full abstract»

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  • Optical subscriber loop transmission within B-ISDN

    Page(s): 230 - 234
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    Optical subscriber loop transmission systems for a broadband integrated systems digital network (B-ISDN) are discussed. The realization of a communication-only system with a hybrid integrated duplexer for bidirectional transmission and the operational results using Fabry-Perot and distributed feedback lasers at 1550 nm are described. The requirements for introducing broadband communication-only systems and distribution-only systems and for the final integration of both systems to a B-ISDN by means of electrical or optical multiplexing are discussed. Aspects of systems using direct and coherent detection are considered View full abstract»

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  • Architecture and technology for the all-fiber loop

    Page(s): 190 - 196
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    Digital loop carrier systems were designed as a replacement for the copper feeder pairs. The distribution portion of the loop remained unchanged. The copper Tl lines required for these systems were replaced with fiber multiplexer systems that provided inexpensive high-capacity feeder routes. Fiber feeder systems allowed a local exchange company (LEC) to increase the capacity by changing the electronics without adding more fiber to an often congested feeder route. The authors discuss the rationale for an all-fiber loop, LEC operations, and the optical technology and architecture used in the all-fiber loop View full abstract»

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  • Optimizing fiber planning in the loop

    Page(s): 156 - 160
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    Planning for fiber-optic systems in the loop to optimize allocation of facilities is discussed. A novel equipment model describes electronic system configurations at fiber sites in the loop so that they can be used for bit-rate optimization. An economical fiber planning module provides new functionality to planners, including automated selection of fiber terminating multiplexer bit rate and dynamic fiber cable sizing. It also provides flexible representation and manipulation of multitechnology service positioning equipment in the loop View full abstract»

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  • The technological benefits of digital loop carrier using fiber facilities

    Page(s): 169 - 173
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    The first step toward an all-fiber loop plant, namely, fiber-feeder deployment, is discussed. Modern fiber multiplexers and digital carrier systems offer technology designed for the outside plant environment, to provide a cost-effective vehicle for early deployment, while establishing a base for future narrow and broadband ISDN services. A fiber-feeder system also makes it feasible to move toward an all-fiber distribution system with capabilities such as video. System architecture and deployment arrangements are described View full abstract»

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  • Flexible access systems [optical pipeline]

    Page(s): 128 - 132
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    A description is given of a means of providing the normal range of services to business customers through an optical pipeline. The system design, called a flexible access system, is in service and widespread implementation is expected. The author sets system design in the context of wider network developments and explains in detail the design features. Introduction of optical fibers into the access network is being accomplished in several phases. The first of these is the provision of direct optical fibers and their associated electronics to major customer sites. The first systems are operational View full abstract»

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  • Domestic premises networks

    Page(s): 113 - 117
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    In the domestic environment, electric and electronic equipment can be grouped in different clusters. To interconnect the equipment within a cluster, different networks are being developed. However, several applications may use equipment located in more than one cluster, so these networks need interconnections. These interconnections are handled in interworking units (gateways), which may decrease service performance and/or increase the costs. A new concept for domestic networks in a B-ISDN environment is introduced that minimizes interworking and provides additional features to the user View full abstract»

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  • Passive fibre local loop for telephony with broadband upgrade

    Page(s): 179 - 183
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    A new and potentially economic method has been identified to serve small business customers (say less than 20 lines) and eventually the residential market via an all-fiber access network. The target is to provide a fiber network justified solely on the basis of known services such as telephony while laying down a fiber infrastructure that can support a wide range of new services from telemetry to CATV and b-ISDN. The solution lies in sharing a single-mode feeder fiber from the exchange over several customers premises using a number of passive optical splitters in the street network. Time-division multiple access is used initially on one wavelength to support telephone while other wavelengths will be used later to support future service upgrade including broadband View full abstract»

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  • Experiences with an inhouse network using the ISDN-standards

    Page(s): 6 - 9
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    A description is presented of the experience gained during the field trial of an ISDN inhouse network. Experience showed that the concept of using ISDN standards on the extension of the network has been accepted. The customer has realized the advantage of being able to use a large number of terminals from either single or various suppliers, as desired. The technology itself, especially the protocol definitions, is stable. By making a few minor changes, higher stability of the ISDN inhouse network has been achieved View full abstract»

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  • Noises and disturbances in the local network: a new challenge for the ISDN

    Page(s): 35 - 41
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    The different disturbances appearing in the local network are described and analyzed in order to define engineering rules and specifications for the introduction of ISDN basic access systems. Noises such as impulsive noise and digital crosstalk are studied using measurements and computer simulation. Overvoltages are analyzed using numerous records on subscriber lines. Specifications and protection methods against disturbances due to the power network are presented View full abstract»

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  • Experimental ISDN system with multimedia storage and intelligent service control capabilities

    Page(s): 123 - 127
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    ISDN involves three integrations: media, functional, and user-interface integration. With this understanding, the authors have developed teleconferencing, multimedia mail, and electronic secretary services which make use of two strong points of ISDN: a clean B channel and advanced D channel signalling. Multimedia communication using multiple digitized B channels can be applied in both real-time communication service (teleconferencing) and store/forward service (multimedia mail service). The D channel allows user network control and provides users with customized services such as the electronic secretary service. The basic concept of these services and the experimental ISDN system for evaluating them are described View full abstract»

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  • Performance of 2B1Q transmission system for ISDN basic access

    Page(s): 24 - 28
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    Based on extensive studies by the ANSI T1 Committee, the 2B1Q line code was chosen as the carriage mechanism for ISDN basic rate deployment. To explore the performance limits of this code, a system was built and tested. The system is described, and issues and performance measurement techniques are addressed. It is demonstrated from analysis of the measurement results, the loop loss distribution, and the worst-case crosstalk values that up to 98% of the North American nonloaded loops can be covered with adequate performance and noise margin View full abstract»

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  • Design aspects and field trial results of a subscriber loop transceiver for the ISDN basic access

    Page(s): 52 - 56
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    The authors deal with activities and developments carried out in Italy concerning the subscriber loop transceiver and transmission system structure for the ISDN basic access. The ECBM (echo canceller burst model) transceiver is implemented (in the present introductory solution) by a dual-chip version: an analog section and a digital one. The analog section is implemented by a full custom technique using 1.5 μm double polysilicon layer CMOS technology. It contains filtering/equalization structures for transmission/receiving functions, a line driver to drive the line coupling transformer directly, and an 11 bit D/A converter used, in conjunction with the processing section, to perform the echo cancellation and the digital line equalization. The digital section implements the digital signal processor to perform the echo cancellation and DFE algorithm, timing extraction, frame formatting and decoding, and the activation/deactivation procedures. The transmission system structure and functionalities of the ISDN basic access are described. Laboratory and field trial results are summarized View full abstract»

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