It might be asked, why am I here and why does Australia, a country of 7,682,300 square kilometers (2,966,138 square miles) that is, about as big as the continental U.S., but with a population of only about 18 million,...
It might be asked, why am I here and why does Australia, a country of 7,682,300 square kilometers (2,966,138 square miles) that is, about as big as the continental U.S., but with a population of only about 18 million, take such an active part in DTTB studies? The answer is national interest — the same force that is driving European, Japanese, and North American developments in HDTV and Advanced TV systems.
This paper discusses the need for a signalling transfer point (STP) in an ATM based broadband signalling network. The role of the STP in routing the level 3 message transfer part (MTP3) messages within the existing si...
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This paper discusses the need for a signalling transfer point (STP) in an ATM based broadband signalling network. The role of the STP in routing the level 3 message transfer part (MTP3) messages within the existing signalling network is explored, including an overview of the use of the originating point code and destination point code. The types of signalling traffic that a signalling system number 7 (SS7) network is anticipated to transfer in a broadband environment is considered by reference to the ITU Q.73 functional model and an intelligent network environment. The functionality of the routing role of MTP3 is compared with the ATM switch's capabilities and the use of ATM permanent virtual channels (PVCs) to carry SS7 signalling messages beyond adjacent nodes is proposed as an alternative to STPs. An outline is given of the benefits and overheads that such a strategy would bring.
This paper briefly describes some of the issues arising from the introduction of 'on-demand' calling into the evolving broadband network. It goes on to describe a demonstrator created at BT Laboratories to hel...
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This paper briefly describes some of the issues arising from the introduction of 'on-demand' calling into the evolving broadband network. It goes on to describe a demonstrator created at BT Laboratories to help understand and explain some of the processes involved. Call handling includes not only communication with the end-users and other network switches via the appropriate signalling systems, but also the decision-making process an whether and how to accept the call that has been requested. If the call is accepted, the call handling function will also be concerned with the progress of the call itself. The demonstrator is based on a small commercially available ATM cross-connect to which we have added call handling software. This latter resides on an attached workstation which communicates over the switch management interface. Two additional workstations have been fitted with 100 Mb/s TAXI interfaces and serve as user terminals, each connected to the switch.
This paper is written from the perspective of an applications developer rather than a network operator or switch manufacturer. The main focus is on the needs of domestic users, and the companies that want to provide b...
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This paper is written from the perspective of an applications developer rather than a network operator or switch manufacturer. The main focus is on the needs of domestic users, and the companies that want to provide broadband services to them. It looks at the development of broadband applications in the real world. Then the application of those lessons to the signalling architectures needed for the new domestic services is examined. The broadband Internet will be what makes the ATM network profitable. However, we need to rethink our whole approach to the development of signalling protocols, and concentrate on simplicity, flexibility, and performance.
The paper discusses some of the problems seen with the integration of signaling for support of integrated services Internet over broadband ISDN. In it we contrast the mechanisms employed by the Internet resource reser...
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The paper discusses some of the problems seen with the integration of signaling for support of integrated services Internet over broadband ISDN. In it we contrast the mechanisms employed by the Internet resource reservation protocol, RSVP with those of B-ISDN and Q.2931. We do not propose any solution, but try to give an indication of the direction that signaling for broadband networks must evolve to support more effectively the higher level services that most users will be employing.
The article provides an overview of the issues facing standards setting activities for broadband signalling. It begins with an exposition of the service drivers that are motivating further signalling specification and...
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The article provides an overview of the issues facing standards setting activities for broadband signalling. It begins with an exposition of the service drivers that are motivating further signalling specification and a brief discussion of the composition of the traditional standards groups and new industry groups involved. After indicating the essential aspects of signalling that need to be addressed, the article concentrates on an exposition of the currently hot signalling topics undergoing standardisation. These include a focus on control of multiple and multipoint connections, increased user involvement in control of connections and increased user involvement in congestion management. As part of this discussion, architectural approaches to signalling and control under consideration by various groups are highlighted. The conclusions of the article are that many standards exist for broadband signalling, many more are in preparation and that some of the current standards may be expected to change over time.
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