Telecommunications system

Details Telecommunications system Telecommunications system

1997-07-22

2001-07-24

Patel, Ajit (Department: 2661)

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

C370S395430, C370S474000

Reexamination Certificate

active

06266343

ABSTRACT:

This invention relates to a system and method for the transport of voice or data traffic over a telecommunications network.
BACKGROUND OF THE INVENTION
A recent innovation in telecommunications technology ha s been the introduction of the asynchronous transfer mode (ATM) transmission protocol. In this technique, information to be transmitted is loaded into packets or cells each of which is provided with a header containing information that is used for routing the cell to its correct destination. The header packet or cell may also contain other protocol control information relating to the cell payload and, in particular may include a cell sequence number so that cells received at a destination, possibly via different routes, may be unpacked in the correct order to recover the payload contents. The sequence number can also be used to indicate missing cells.
As the technique h as developed, ATM networks have evolved to handle different types of traffic, for example narrow band voice, wide band video and low bit-rate multi-user. Each particular network traffic type is adapted to its traffic content an ATM network by the use of an ATM adaptation layer (AAL) a number of which have been defined. For example, ATM adaptation layer type 1 (AAL-1) enables the transfer of n ×64 kbit/s structured data between source and destination whilst preserving the structure information, ATM adaptation layer type 2 (AAL2) provides the ability to encapsulate, multiplex and transport packets of user information inside an ATM cell stream, and so on.
With increasing volumes and variety of traffic, there is now a need for interworking between services supported by different adaptation layers. In particular, there is a need to transmit traffic across ATM networks of different types.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an arrangement and method for transmitting traffic from one ATM network to another ATM network of a different type.
It is a further object of the invention to provide an arrangement and method for transmitting traffic between narrow band networks via first and second ATM networks.
According to the invention there is provided a method of transmitting structured data traffic from a first asynchronous network to a second asynchronous network, the first and second networks having respective first and second adaptation layers, the method including segmenting the traffic on egress from the first network, and encapsulating the segmented traffic on ingress to the second network whereby to preserve the structure information of said data traffic.
According to another aspect of the invention there is provided an arrangement for transmitting structured data traffic from a first asynchronous network to a second asynchronous network, the first and second networks having respective first and second adaptation layers, the arrangement including means for segmenting the traffic on egress from the first network, and means for encapsulating the segmented traffic on ingress to the second network whereby to preserve the structure information of said data traffic.
According to a further aspect of the invention there is provided a method of transmitting structured data traffic from a first narrow band network to a second narrow band network via an ATM network configuration comprising a first ATM network embedded within a second ATM network, the method including adapting the structured data traffic into a first format on ingress to the first ATM network and transporting the adapted data across that network, converting the adapted data into a second format for transport and switching via the second ATM network, reconverting the adapted data from the second format to the first format, transporting the adapted data to the second narrow band network via the first ATM network, and converting the formatted data back to structured data on egress from the first ATM network.
The structured data can incorporate voice signals which have been digitised and which are in e.g. a TDM format.


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