Terminals and signal processing in atm networks (original) (raw)

An open environment for ATM broadband multimedia applications

European Transactions on Telecommunications, 1992

Advances in trasmission and switching technologies promise a flexible and efficient Broadband ISDN (B-ISDN), based on Asynchronous Transfer Mode (ATM), able to meet the increasing demand of high speed services. Multimedia applications are in particular expected to play a key role in B-ISDN success. The paper wants to outline the architecture of an open environment based on a multimedia workstation for ATM developed in the framework of the Italian Information Technology project called Piano Finaliuato Telecomunicazioni (PFT). Design guidelines, interfaces and capabilities are described. After introducing the basic workstation architecture, some aspects of relevant multimedia applications and of the user interface are discussed. (*) Presented at the CNR Seminar: ((Broadband Communication Networks and Services,), (Roma, October 29-30, 1991). By courtesy of CNR Telecommunication Project. Work carried out under the financial support o f the National Research Council (C.N.R.) in the frame of the Telecommunication Project. tomer control, make the evolution toward multimedia and B-ISDN very attractive. At present it is not clear which broadband services will be introduced and the bit rates they will require; CCITT foresees a lot of potential applications in terms of conversational (such as videophony, desktop conferencing, etc.) and messaging and retrieval (such as multimedia mail, video retrieval, document retrieval, etc.) services. 'In general to cope with such a large variety of service components, multimedia terminals will be needed to enable users to work with a single and integrated terminal. This paper outlines the architecture model of the workstation developed in the framework of the Italian Information Technology project called Piano Finalizzafo Telecomunicazioni (PFT): the main goal is to provide, taking into account international IS0 and CCITT standards as well as those recognized de facto, an open environment where new broadband multimedia applications and services could be easily developed and tested. After presenting the research environment and the basic infrastructure, communication protocol architecture, some aspects and trends in multimedia applications, with an accent on open interchange of multimedia information, and user interface are also discussed. 2. RESEARCH ENVIRONMENT The PFT is an Italian Government funded (50%) h itiative to encourage collaborative R&D in broadband communication networks and services, involving national industries, government research laboratories and universities [l]. This 3 years research project will be completed in July 1992 and has the goal to investigate 1 I S Vol. 3, No. 2 Mar.-Apr. 1992 CNR-Proceedings of Seminar on broadband communicoiion neiworks and services-Rome, 1990. CClTT-Recommendation 1.121: Broadband aspects of ISDN-Blue Books, 1988. CCITT-New Recommendation 1.321: B-ISDNproiocol reference model and its application, 1991. CCITT-New Recommendation 1.362: B-ISDN A T M Adaptation Layer (AAL) functional descripiion, 1991. CCITT-New Recommendation 1.363: 6-ISDN A T M Adaptation Layer (AAL) specifcarion, 1991. CClTT-New Recommendation 1.432: B-ISDN user-net work interfacephysical layer specification. 1991. CCITT-New Recommendation 1.361: B-ISDN ATM layer specification, 199 I. CCITT-Recommendation C.722: 7 kHz audio coding wiihin 64 Kbit/s-Blue Books 1988. CCITT-New Recommendation H.261: Video codec for audiovisual services ai px64 kbit/s, 1990.

Experiences with ATM Equipments and Network Operation

1996

There are ATM nodes from several vendors in the market and some operators even are offering public ATM services. However, in order to really make a breakthrough of ATM we must develop ATM applications which are acceptable also by others than computerwizards. Our paper gives an outline of the ATM evolution from separate nodes to real and practical services utilizing ATM technology. One of the most prominent experiences of current situation is continuously evolving standards. First adopters have faced a dilemma of never ending software and hardware updates. Although we may except that Internet will be upgraded to ATM because of increasing capacity and quality requirements, the definitive role of ATM in the whole network architecture is still shrouded in mystery, and a lot of practical and theoretical questions are open.

Video on demand over ATM: system design and networking requirements

1998

Abstract In recent years there has been a strong interest in transmitting compressed Video over ATM. Previous work has dealt with transmitting MPEG over CBR and VBR services of ATM. The ABR service of ATM is expected to be much more cost e ective than CBR or VBR. There has been a limited amount of work done in transmitting video over ABR. However, there hasn't been much work done on running client/server applications (for example, video on demand) over ABR.

Multimedia over ATM: progress, status and future

1998

Abstract Multimedia is an emerging service which integrates voice, video and data in the same service. With the progress made in high speed large capacity multimedia servers, high speed networks, cost effective QoS, acceptable service category and cost effective set top boxes, it is currently possible to carry multimedia over high speed networks cost effectively and efficiently. This paper surveys the progress made and the future of efficiently carrying multimedia over ATM networks

High Performance ATM Terminals: Design and Evaluation

Performance Modelling and Evaluation of ATM Networks, 1995

This paper intends to show that even low end tenninals can, under given implementation guidelines, become hosts of multimedia applications over ATM based B-ISDN. The main line of thought is that the tenninal has to be seen as an Interworking Unit between its peripheral devices (disks, etc.) and the high bandwidth network. This view enables to jointly address and process in a "centralized" manner, layered protocol stack(s) used for accessing the network and the peripheral devices. In particular we give directions to eliminate unnecessary block transfers in memory and explain why extensive hardware implementation of the A TM protocol stack is not required to achieve high performance.

An ATM access network for multimedia communications

Proceedings of International Conference on Protocols for Multimedia Systems - Multimedia Networking, 1997

In an ATM Customer Premises Network, there is ahantage in having shared access across the one Broadband User Network Interface (UNI). In this paper, we consider ATM shared access issues based on the GFC protocols as network support for multimedia communications, and we propose a mechanism for shared-medium access to an ATWB-ISDN network to support multimedia traffic. The access scheme proposed is based on direct access to a slotted medium on ring network. By installing insertion buffers at each station reduces media access time, and using spatial reuse by destination release procedure increases the throughput. The proposed Reset-Window with Buffer Insertion Protocol (RBI) includes multiple prioritized access to be able to transport multimedia communications. This access protocol is described and its performance is analyzed. The mean cell access delay and the fair sharing of the non-guaranteed bandwidth are evaluated by a simulation.

Signalling protocols for multimedia application: Prototype for an ATM test-bed

European Transactions on Telecommunications, 1992

Currently under study as part of the future ATM based communication network definition is the development of a flexible signalling system. This document shows how the signalling protocol prototype at the User to Network Interface was defined in an ATM test-bed. Taking Rec.Q.931 as a starting point, we introduced into the new signalling protocol structure the concept of Call Control and Bearer Control separation thus making it possible to handle multiconnection and multiparty call configurations in an easy way.

ITU-T standardization of audiovisual communication systems in ATM and LAN environments

IEEE Journal on Selected Areas in Communications, 1997

This paper presents the ITU-T Study Group 15 development of H-series Recommendations that allow interworking between different audiovisual communication terminals manufactured by different equipment providers. The paper focuses on H.310 and H.321 systems for broad-band ATM environments and H.322 and H.323 systems for LAN environments where the quality of service may or may not be guaranteed. The paper first lists the Recommendations developed by the ITU-T for audiovisual communication systems and the network environments in which they may be used. It then describes the design philosophy, the network specific characteristics, and hardware trials for each system. Then it describes the communication control protocol defined in H.245 which is used commonly by different audiovisual communication systems. Finally, the paper discusses interworking scenarios for communication between the different types of terminal on different networks.

ATM Networks: Issues and Challenges Ahead

Arxiv preprint cs/9809084, 1998

Abstract: The paper begins with a discussion of current trends in networking and a historical reviews of past networking technologies some of which failed. This leads us to the discussion about what it takes for a new technology to succeed and what challenges we face in making the current dream of a seamless world-wide high-speed ATM network a reality.