Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1997-11-12
2001-04-24
Rao, Seema S. (Department: 2661)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S466000, C370S467000, C370S522000
Reexamination Certificate
active
06222843
ABSTRACT:
This invention relates to telecommunications networks and in particular to the provision of services in such networks.
BACKGROUND OF THE INVENTION
Within the Telecommunications industry there are a number of initiatives to unbundle telecommunications services from the switches which provide them. Currently this is embodied by Intelligent Networking (IN) whereby the switches are provided with a number of trigger points at which they send a message to a Services Control Point in order to establish the next step in processing the call. Although IN has achieved many significant capabilities it is generally regarded as not being a sufficient separation of concerns to deal with the complexities that are now enabled by asynchronous transfer mode (ATM) networks.
In one approach to this problem, narrow band services are provided within the B-ISDN by mapping single 64 kb/s channels into ATM adaptation layer 1 (AAL1 VCs) and connecting them as switched VCs across the network, this creates the difficulty that the cell assembly delay of six milliseconds leads to a substantial revision of the network delay plans and a substantial increase in the requirement for echo cancellers, it also leads to the need for inter working between ISUP and B-ISUP signalling protocols leading to a substantial increase in the complexity of B-ISUP.
A general description of interworking of broad band and narrow band services using flexible signalling connections is given by Akihiro Sera et al. in Fujitsu Scientific and Technical Journal, Vol 28, No 2, Jan. 1, 1992, pages 150-159. This paper describes the enhancement of a digital switching system to evolve to a multi-service platform which can provide services for various media and interfaces.
SUMMARY OF THE INVENTION
An object of the invention is to minimise or to overcome this disadvantage.
It is a further object of the invention to provide an improved arrangement and method for providing narrow band services in an ATM communications network.
According to one aspect of the invention there is provided an open Services architecture for inter working narrow band services with equivalent broad band services in an ATM network and incorporating adaptation means whereby the services may be delivered on both the existing narrow band network and a future broad band network based on flexible signalling connections, the architecture incorporating an adaptive grooming router providing a fully interconnected backbone network function providing connectivity between a plurality of multimedia access routers and a narrow band network, wherein the multimedia access routers provide each a hub point where access units terminating ISDN basic access and primary rate access lines used for multimedia services are terminated.
According to another aspect of the invention there is provided a method of inter-working narrow band services with equivalent broad band services in an ATM network incorporating adaptation means whereby the services are capable of being delivered on both the existing narrow band network and a future broad band network based on flexible signalling connections, the method including providing a fully interconnected backbone network function providing connectivity between a plurality of multimedia access routers and a narrow band network, wherein the multimedia access routers provide each a hub point where access units terminating ISDN basic access and primary rate access lines used for multimedia services are terminated.
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Lee Mann Smith McWilliams Sweeney & Ohlson
Nortel Networks Limited
Rao Seema S.
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