Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1997-03-19
1999-10-19
Patel, Ajit
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370400, 370442, 370474, H04L 1328, H04L 1256
Patent
active
059700688
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a telecommunications system, and more particularly to an arrangement for sending messages or files between servers in a system comprising a plurality of servers interconnected by a TDM backbone and able to share a common channel or bandwidth. The invention also relates to a device for implementing a TDM (Time Division Multiplex) based cell relay transport mechanism for high speed communications.
Telephony servers or MVIP (Multi-Vendor Integrated Protocol) servers interconnected by high speed TDM (Time Division Multiplex) backbones are now becoming available in the communications industry. One such system is described in our co-pending Canadian patent application no. 2109534 filed on Nov. 19, 1993. Applications of such distributed systems are: distributed PBX, Interactive Voice response systems, Video and voice mail systems, multimedia networks, Intelligent Switching Hubs, communication systems with fast messaging requirements such as hand-off signaling in wireless applications and others.
When such systems are used in association with other Mitel devices, such as the Voice/MVIP Interface circuit (VMIC), they allow the implementation of a transport system that mixes time-slot and ATM cells together in the same TDM backbone (See our co-pending application referred to above).
In such systems there is a need to establish a Common Channel Signaling/Messaging solution between telephony servers (e.g., call control data) as well as general data transfer (e.g., fax data).
Our co-pending Canadian patent application no. 2,058,654 described a Media Access Control (MAC) mechanism that allows several servers connected to the same ring to share a common channel or bandwidth available in the ring to send messages or files between each other. This mechanism is known as a G-bus.
Existing TDM systems utilize bit oriented protocols such as HDLC or proprietary messaging to perform intermodule or interboard signaling. Other systems that are not TDM based and are used in LANs such as FDDI or token ring, utilize their own asynchronous protocols to perform Media Access Control mechanisms.
Existing signaling devices such as HDLC controllers are not designed for transmission at high speeds. Some controllers today available in the market operate up to 52 Mb/s. Other devices have throughput limitations and cannot handle messages with transmission rates beyond some hundreds of Kb/s. Other similar schemes being announced in the market today are FDDI-2 (100 Mb/s) and IsoEthernet (16 Mb/s) technologies that allow isochronous and asynchronous data to be multiplexed together on to the same physical TDM backbone.
The article entitled Implementing the Orwell Protocol over a Fibre-based High-Speed ATM network, Electronic and Communication Engineering Journal, Vol. 4, no. 6, December 1992, discloses and ATM-like protocol that sends cells round a ring. Cells can be placed on or removed from the ring at nodes. However, this article does not disclose an arrangement that permits the transport of TDM traffic on the ring.
Accordingly the present invention provides a telecommunications system comprising a plurality of servers interconnected by a high speed TDM backbone defining a plurality of timeslots, said servers being able to share a common channel or bandwidth, a master node for sending a continuous stream of cells carrying asynchronous data in the form of files or control messages round the backbone, each said cell having a header portion and a payload portion, and a plurality of downstream nodes which upon arrival of incoming cells insert information therein, read information therefrom, or allow said cells to pass thereby unaltered, characterized in that a high-speed framer on said backbone is connected to an interface device for time division multiplexed delay-sensitive traffic and to a transport protocol circuit generating said stream of cells and performing format, mapping and MAC functions to interface said cells to said TDM backbone, and said interface device generates control signals to control the transmission o
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De Korte Lee
Gray Tom
Peres Mauricio
Mitel Corporation
Patel Ajit
Phunkulh Bob A.
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