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

A High Speed Optical Data Transfer Network (HSODTN) experimental research prototype has been constructed for the Naval Sea Systems Command (NAVSEA)1. It was installed at the Naval Research Laboratory (NRL) to explore new high speed fiber optic network concepts and technology applications for broadband communications. The present status and objectives of the HSODTN are outlined. This experimental network utilizes a 1 . 7 Gb/s lightwave transmission system that serves as a fiber optic backbone. It can readily be upgraded to Asynchronous Transfer Mode (ATM)/Synchronous Optical Network (SONET) standards. The basic prototype hardware architecture consists of a network interface (i. e. Media Access Control (MAC) layer) and several independent modular units that interface with various lower bit rate services. At the MAC layer integrated services are supported by giving priority to those traffic types requiring bounded delay. The organization is modular allowing components and services to be added or improved while redesigning the minimum amount of hardware. The software network architecture includes a network controller to configure monitor and administer the network.

Broadband Services Implementation by Using Survivable ATM Architecture

This work studies the performance of a proposed high-speed optical fiber local area network based on wavelength division multiplex- ing (WDM) and asynchronous transfer mode (ATM). The design opti- mizes the usage of resources by assigning different types of traffic to two overlapping sub-networks. The WDM segment is a circuit-oriented net- work for high-speed traffic. The ATM sub-network handles control, low speed traffic and overflows of the WDM network. Each network is sup- ported by one of two types of channels. The ATM channel employs con- ventional ATM cells for all stations using a 1300-nm wavelength carrier. The WDM channel which is assigned dynamically for very high-speed applications operates at 1500 nm band. The application of an ATM net- work to handle the overflow traffic reduces blocking in the system by approximately 13% for a 32 WDM system. However, depending on the load, it may increase the delay between 5% to 30%. In addition, employ- ing an adequate queuing policy, we may reduce the blocking by 30% while increasing the delay by 5%. We may conclude that the network is more efficient handling the traffic load compared to a simple circuit switched WDM network. © 1999 Society of Photo-Optical Instrumentation Engi- neers. (S0091-3286(99)02511-8)

The wiring of a customer's premises network (CPN) may be the weakest link in the end-to-end transport of residential broadband digital services such as digital video. Detailed knowledge of how such premises wiring will affect digital service delivery is critical to the cost-effective deployment and robust operation of digital technologies. This paper reports selected results from a series of experimental and analytical studies of coaxial-cable premises-wiring impairments for digital broadband signals. The investigations included return loss, isolation and attenuation measurements of a wide variety of components, as well as measurements and simulations of bit-error-rate performance for several inside-wiring test-bed configurations. The components showed a broader range of performance, and in some cases considerably worse performance, than indicated in previous studies. The premises wiring generated signal reflections which can severely degrade digital transmission. Some reflections can cause destructive interference that effectively decreases the received signal power by 10 dB more than the nominal attenuation, and this decrease is not mitigated by set-top or cable-modem adaptive equalization.

ATM for legacy aircraft avionics

The synchronous residual time stamp method (SRTS) is one of the proposed timing recovery methods for constant bit rate (CBR) services over asynchronous transfer mode (ATM) networks. ATM adaption layer 1 (AAL1) is used to specify these CBR services and is usually called the circuit emulation application such as DS1 and DS3. The paper gives both a characteristic and conformance testing method for RTS parameters in a synchronous optical network (SONET) based broadband integrated service digital network (BISDN), which has the reference clock hierarchy derived from a 155.52 MHz network.

Losing ATM (asynchronous transfer mode) cells in an interworking unit between a high-speed LAN (local area network) such as a Gbit/s CRMA (cyclic reservation multiple access) LAN and an ATM based wide area network can be a serious problem due to the retransmissions caused by the higher layer protocol. The authors propose a flow control protocol, which, exploiting the characteristics of the CRMA scheme, regulates the emission of cells towards the CRMA/ATM interworking unit so that its buffer resources are not saturated. The emission of the ATM stations is controlled via a backpressure mechanism. The capacity of the gateway buffer is virtually increased by utilizing the network latency as well as the station buffers. The main protocol performance is analyzed by simulation. >

A scheme is proposed to convert the data formats between the HIPPI (high performance parallel interface) and ATM (asynchronous transfer mode) protocols. A possible method of implementing the HIPPI broadband terminal adaptor (HIPPI-BTA), which interfaces multiple HIPPI channels to the SONET (synchronous optical network)/ATM network, is also presented. A preliminary study indicated that the HIPPI interface of the high performance computer hosts and the SONET/ATM standards of the future broadband communication networks have a high potential to work well with each other. >

The introduction of Asynchronous Transfer Mode (ATM) and other high speed networking protocols has increased the demand for higher speed transmission facilities in data communications, telecommunications and video networks. Fiber optics is well suited as an ATM transmission medium due to its inherent bandwidth and throughput capabilities. Although ATM is the current logical method of routing high speed transmissions, it is still subject to the properties of its physical transmission medium. This paper highlights issues associated with the management of fiber optic networks in an ATM environment and how new optical transmission products can improve network utilization and reliability in the areas of disaster recovery, testing, and network management.

6 Chapter - Client Layers of the Optical Layer

A hybrid transfer mode (HTM) broadband ISDN (integrated services digital network) is presented. It is a high-speed integrated services digital packet-switching communication network. It can provide users within a unified network with multiple services based on different performances and capabilities. The SONET (synchronous optical network) signal standards are chosen as the link-rate and frame format structure. STM (synchronous transfer mode) and ATM (asynchronous transfer mode) are adopted not only to guarantee the transmitting quality for both delay- (as well as jitter-) sensitive signals and loss-sensitive signals but also to increase the network resource utilization efficiency.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Fiber-optic communications in Hong Kong are reviewed. The aspects examined are the junction networks; optical systems; the local network; wideband services; and future trends in wavelength division multiplexing (WDM), synchronous optical network (SONET), metropolitan area networks (MAN), fiber to the home, and asynchronous transfer mode (ATM). In 1981, fiber-optic transmission was introduced. Now, over 95% of all interexchange connections are digital, and 75% use optical fiber. The digital transmission hierarchy used observes North American standards. >

Supercomputing `93, a high-performance computing and communications conference, was held November 15th through 19th, 1993 in Portland, Oregon. For the past two years, Sandia National Laboratories has used this conference to showcase and focus its communications and networking endeavors. At the 1993 conference, the results of Sandia`s efforts in exploring and utilizing Asynchronous Transfer Mode (ATM) and Synchronous Optical Network (SONET) technologies were vividly demonstrated by building and operating three distinct networks. The networks encompassed a Switched Multimegabit Data Service (SMDS) network running at 44.736 megabits per second, an ATM network running on a SONET circuit at the Optical Carrier (OC) rate of 155.52 megabits per second, and a High Performance Parallel Interface (HIPPI) network running over a 622.08 megabits per second SONET circuit. The SMDS and ATM networks extended from Albuquerque, New Mexico to the showroom floor, while the HIPPI/SONET network extended from Beaverton, Oregon to the showroom floor. This paper documents and describes these networks.

Just imagine, being able to immerse yourself into a virtual world where you could see the results of your actions with respect to other realistic entities (i.e. people, machines, environments) in a particular scenario. Then, imagine the expansion of this virtual world through the interaction of real-time distributed simulations. This interaction of real-time distributed simulations could greatly enhance education and training, operational verification of design, and mission rehearsal functions needed to support the defense and commercial industries. Through the advancements in technologies (i.e. visual systems, host processors, databases, and networks), we can now realize the expectations of this virtual world. This paper addresses the network requirements for a federal government initiative called Distributed Interactive Simulation (DIS). Through our discussion of the DIS environment, we will identify the services and performance capabilities required of advanced network architectures, and relate these requirements to the proposed capabilities of the standard-based broadband technologies of asynchronous transfer mode (ATM) and synchronous optical network (SONET). We map the DIS network requirements to the capabilities inherent to these broadband technologies, and specify the access of those capabilities from the DIS application through the broadband network and services. >

What is probably the most unique aspect of the North Carolina information highway is the spirit of cooperation that exists between the public and private sectors, as well as cooperation within each of those sectors. North Carolina initiated the first state-wide information highway to utilize asynchronous transfer mode (ATM) switching and synchronous optical network (SONET) transmission equipment. Several trials have been conducted using ATM technology, but this is the first operational network to be deployed on such a large scale. The initial sites include hospitals, universities, community colleges, public schools, correctional facilities, and various administrative government locations. North Carolina requested that telephone companies within the state work together to develop a proposal for a comprehensive network that would not only serve state government applications, but the applications of current and prospective businesses in the state. This allows the state to share risks associated with building the first network of this type, and also places the responsibility for operations and upgrades with the telephone companies, so that their expertise in these areas can be utilized.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>