Showing papers on "10G-PON published in 1989"

Optical networks for local loop applications

Abstract: Some of the options for optical technology within the local loop environment are examined. In particular, passive shared access networks have been considered in some detail. These networks show great promise for delivering existing telephone services to small to medium business customers (4-30 lines) economically by the early 1990s. Extending fiber to the home will also be possible by virtue of a similar passive network infrastructure for customers requiring new broadband services beyond the single telephone line. For one-line plain old telephone service (POTS) customers, an intermediate approach of terminating the fiber network at the final network distribution point, with copper retained for the final leg, may be used prior to the provision of broadband services. A key feature of the passive optical network architecture is the use of wavelength-division multiplexing (WDM) as an upgrade strategy, allowing graceful upgrading from telephone services to multichannel high-definition television (HDTV) on gigabit/second bearers and full two-way switched broadband services employing wavelength routing across the network. >

Fiber-based local access network architectures

Abstract: The attributes of the various architectural alternatives are discussed. Several systems proposed for the delivery of telephone service and/or distributive video services in the local access network are described. The status of the standardization of interfaces for the broadband integrated services digital network (BISDN) based on the synchronous optical network (SONET) and asynchronous transfer mode (ATM) is examined. >

Optical fibers reach into homes

Abstract: The replacement of the standard series-connected pair of twisted copper wires that connects each home to the telephone network today by optical-fiber cabling that can handle broadband services is discussed. The technologies needed for the fiber to the home, which are dominated by such considerations as bit rates, network architecture, and power dissipation, are discussed. Various combinations of services and technologies that are currently undergoing trials are described. Future evolution into broadband networks is discussed. >

Design alternatives of asynchronous WDM star networks

Abstract: Various architectural alternatives for asynchronous wavelength-division multiplexing (WDM) optical local area networks are discussed. Different choices of receiver/transmitter functionality, the number of buffers, and the number of wavelengths are studied and their effect on system performance are analyzed. An analytical solution is introduced to allow a uniform treatment of the various designs within the same modeling framework. The results show the interdependence between the system's hardware complexity and its potential performance. >

H-Bus: an experimental ATM-based optical premises network

Abstract: An optical customer premises network (CPN), called H-Bus, designed to interface future broadband ISDN signals and distribute available bandwidth to terminal equipment connected to the CPN, is discussed. Key features of this network are the use of optical fiber as a transmission medium and a hybrid architecture, namely, a broadcast bus for the downstream (network interface to subscriber terminal) and a looped bus for the upstream (subscriber terminal to network interface) traffic. The physical layer of the network makes use of the synchronous optical network (SONET) transmission format. The user information is carried using the asynchronous transfer mode (ATM) technique. The reliability of H-Bus is improved through the use of a network component called an optical protection socket (OPS). This is an automatic optical bypass switch that protects the CPN in the case of individual node failures. To resolve any access contention on the upstream bus, a multipriority media access control protocol has been defined. Its performance is compared with that of protocols used in other high-speed local area networks. >

Plans for the Bishops Stortford (UK) fibre to the home trials

Abstract: Plans for a British trial of novel topologies for fiber to the home are now at an advanced stage. The reasons and objectives for the trial, the technologies to be deployed, and the proposed layout and timing of the trial are outlined. The passive optical and switched-star networks to the tested are described, and the optical plant and operational support system are discussed. >

Improved multiple access schemes for very high speed optical fiber local area network using a passive star topology

Abstract: A number of random-access protocols were introduced and analyzed by I.M.I. Habbab et al. (1987) for a very high-speed optical data network based on a passive star topology. The author provides a number of more efficient protocols for the same hardware architecture and characterizes their improved performance. In particular, he concentrates on the most simple algorithms which are based on the ALOHA protocol and do not require any kind of carrier sensing. Their performance is independent of a, the normalized propagation time of packets over the optical medium. This property is rather important when dealing with very high speed data networks which result in high values of a, because the performance of the convenient carrier sensing schemes is poor under such conditions. The protocols presented perform better than the corresponding protocols of Habbab et al. for all values of system parameters. >

Multidimensional optical switching networks

Abstract: A novel switch fabric which trades the inherent spectral and spatial bandwidth of optical systems against a reduction in equipment complexity is described. The architecture, which is based on a multiple access bus structure, is nonblocking in the wide sense and capable of graceful growth. It also offers the possibility of achieving the theoretical minimum of crosspoints needed for a generalized interconnection network. It is anticipated that experimental multidimensional bus switched (MDBS) networks with Tbit throughput could be designed around currently available research components. The design of such networks and the technology options are described. It is noted that there a number of technology paths open that would lead to very large MBDS networks with throughputs well beyond what is readily obtainable with conventional electronic architectures; one interesting development in this direction is the D fiber back plane. >

British Telecom TPON application in the US network

Abstract: The authors discuss the cost modeling against copper of various forms of TPON (telephony over a passive optical network) in a typical US environment. Passive optical networks such as TPON, with their lean use of fiber and low-fixed costs, are shown to be less sensitive to distance than copper. This leads to he conclusion that the approach can be a cost-effective method of delivering POTS while providing an effective platform for future wideband or broadband upgrades. Although TPON has been used as a role model for this costing, several approaches should be capable of similar results. >

Architecture design of optical customer premises network

Abstract: A new optical customer premises network (CPN), which the authors call H-bus, has been designed to terminate future broadband ISDN signals and distribute the available bandwidth to terminal equipment connected to the CPN. The physical layer of the network makes use of the synchronous optical network (SONET) transmission format. The user information is carried using the asynchronous transfer mode (ATM) technique. The reliability of H-bus is improved through the use of a new optical component. >

An architecture of optical passive bus for broadband CPN (customer premises network)

Abstract: The authors discuss the broadband customer premises network (CPN) configuration for B-ISDN (broadband integrated services digital network) and propose an optical passive bus scheme with ATM (asynchronous transfer mode) access. To confirm the feasibility of the optical passive bus, the authors studied optical level diagrams and the collision on ATM multiple access. Novel techniques of level control and collision control are introduced. An intra-CPN communication scheme is also proposed. An optical passive bus scheme with multipoint connections and possible application to CCITT standards is also shown. >

An optical fibre-based Local Backbone Network

Abstract: The authors describe an optical fibre system for local distribution which has a star topology and is designed to carry both interactive and bulk data, voice and video teleconferencing Up to eight arms, each consisting of full-duplex optical links operating at a rate of 40 Mbps, radiate from a central switch User traffic enters the system through user access nodes at the ends of the arms The guiding philosophy of the system which is based on taking advantage of the large available transmission bandwidth in order to simplify processing in the central switch Within the switch a form of time slot interchange is used to route traffic between the arms A flexible strategy based on time division multiplexing is used to divide the bandwidth among users in a way which guarantees an upper bound for user delay The network design philosophy, as well as a detailed description of the operation of the network, are presented

Optical bus architecture for co-deployment of telephone and CATV services in the FRG

Abstract: An integrated optical-fiber-based system which provides both CATV and telephone service to the home has been designed under contract to the Deutsche Bundespost and is planned for pilot installation early in the 1990s in Cologne. A passive optical bus provides the subscriber with access to network services. The optical signal is noninvasively coupled at the street for processing and final connection to the subscriber with copper wire drops. The telephone portion of the network initially provides conventional telephone service based on digital transmission technology, yet is configured to support the development of new services. The CATV portion of the network is designed to be functionally equivalent to the coaxial system now being installed, while offering advantages in reliability and future expansion possibilities. >

An experimental optical fiber local area network

Abstract: The design and implementation of an experimental local area network (LAN) using optical fiber as the transmission medium are presented. Carrier sense multiple access with collision detection (CSMA/CD) protocol based on the IEEE 802.3 standards is adopted for the system design, and the LAN interface cards for PC networking are built with VLSI processor chips. Certain CD techniques suitable for the optical fiber medium are explored. >