B. Vickers and T. Suda, "Connectionless Service for Public ATM Networks," IEEE Communications Magzine, vol. 32, no. 8, 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....Because ATM is connection oriented, interoperability must be provided through the use of connectionless services in ATM [2] Besides such services are desirable as some applications prefer connectionless communication. Several approaches have been proposed to realize connectionless service in ATM [3]. One of them is the use of connectionless servers (CLS) CLSs (interconnected by ATM virtual circuits) form a connectionless overlay network on top of ATM (section 2) This paper presents an approach that improves the performance of this overlay network via selection of suitable CLS sets. To this ....

....by the ATM network via connectionless servers. A CLS is an ATM switch with an extension to maintain PVCs (SVCs) and to make routing decisions depending on the information a cell contains. This extension can be either realized outside the ATM switch (stand alone) or integrated into the switch [3]. Every IWU is directly connected to a CLS. The CLSs among themselves are interconnected e.g. by a full mesh or any other (arbitrary) topology of VCs. Together these connections form a virtual connectionless network on top of ATM. Datagrams (fragmented in cells) are routed from a source IWU via a ....

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Vickers B. J., Suda T., "Connectionless Service for Public ATM Networks", IEEE Communications Magazine, vol. 32, no. 8, pp 34-42, August 1994

....efficiency, direct CL services in a large scale network realized by means of the CLSF seems to be a more reasonable approach. There is growing consensus that providing connectionless service for the interconnection of LANs and MANs in a public ATM environment will more likely entail the use of CLSs[5]. A number of studies concerned about supporting CL data service on B ISDN have been proposed. However, most of the works only concentrate on the general framework of the protocol architectures[6 15] bandwidth management and traffic control[16 19] To the authors knowledge, there exists only ....

B. J. Vickers and T. Suda, Connectionless Service for Public ATM Networks, IEEE Communications Magazine, pp. 34-42, August 1994.

....address contained in the frame header, assembling and reassembling of frames into ATM cells, and switching ATM cells to appropriate ATM VCs to forward the cells to the next CLS or to the destination user terminal. This type of connection less support over ATM is also referred to as direct [21] or server based [5] method. While the server based method is simple and may be attractive to the users because of the lack of end to end connection establishment at the user terminal, maintaining a network of CLSs is expensive for the ATM network provider which will probably result in an extra ....

B.J. Vickers and T. Suda. Connectionless service for public atm networks. IEEE Communications Magazine, pages 34--42, August 1994.

....so on. At the lowest level, bandwidth is distributed among flows belonging to the same connectionless traffic class. 1 Introduction Several different approaches have been proposed for supporting connectionless traffic in ATM networks [2] In this study, we consider the so called direct approach [2, 8] where connectionless servers (CLS) attached to ATM switches provide routing functions for connectionless traffic. In Figure 1 we illustrate the direct approach where two connectionless LANs access the ATM network through interworking units (IWU) Each IWU maintains a permanent virtual path (VP) ....

B. J. Vickers and T. Suda. Connectionless Service for Public ATM Networks. IEEE Communications Magazine, pages 34 -- 42, August 1994.

....through, first adding the destination address and then removing the source. This makes the short address method very unlikely to catch on as a wide spread standard and will probably restrict it to experimental networks. 2.5 Services Another possible solution is to use something called services. [19]. It does not require any modification to the switch protocols, rather it works by providing a specialized server, called a BUS for Broadcast and Unknown Service which can deal with connectionless and broadcast traffic[5] The BUS can actually be implemented as one (or more) dedicated servers. ....

B. Vickers and T. Suda. Connectionless service for public ATM networks. IEEE Communications Magazine, pages 34--42, August 1994.

....basically designed for the shared medium networks that support broadNPAC Syracuse University 3 REQUIREMENTS FOR INTERWORKING BETWEEN ISDN AND NYNET 8 casting or multicasting, so it should be extended to support public wide area ATM network. Several possible approaches are described in [4] and [6]. In the address resolution server approach, the server maintains a table which is updated by the registration protocol everytime an end system joins or leaves the network, or by a learning algorithm. The server responds to the address resolution requests from the gateway. To resolve the problem ....

Brett J. Vickers and Tatsuya Suda, "Connectionless Service for Public ATM Networks", IEEE Communication Magazine, August 1994.

.... connectionless server or at an internetworking unit before they are forwarded to the next hop server (see Figure 1) The above scenario considered in this paper characterizes the frame reassembly operation performed in various solutions (e.g. Frame Relay, LAN Emulation, and IP over ATM [9, 10]) to support connectionless services using AAL5 protocol. In IP over ATM, for example, AAL5 provides the equivalent of data link layer services to support IP. As IP packets enter the ATM network, they are encapsulated into AAL5 frames for transmission according to the IETF stan dard as shown in ....

.... provide IP routing service (see Figure 3) As the connectionless data packets enter the virtual connectionless network within the ATM backbone, they must be adapted to AAL frames at the ATM Adaptation Layer (AAL) The ITU T has defined two AALs to support connectionless services: AAL3 4 and AAL5 [10]. AAL5 is ef ficient, simple to implement, and widely adopted among international standard bodies and ATM Forum. This paper assumes that AAL5 is employed to support connectionless services. There are two proposed methods to forward AAL5 frames in a connectionless server: the stream mode method ....

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B. Vickers and T. Suda, "Connectionless Service for Public ATM Networks," IEEE Communications Magzine, vol. 32, no. 8, 1994.

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Brett J. Vickers et al., "Connectionless Service for Public ATM Networks", IEEE Communications Magazine, August 1994, pp.34-42

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