Resource-decoupled architecture for a telecommunications switching system

• US 4,970,721 A
• Filed: 01/16/1990
• Issued: 11/13/1990
• Est. Priority Date: 09/29/1989
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Aczel, Andrew L., Pfeffer, Robert W., Mellor, Frank, Munter, Ernst A.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Edwards, Christopher O.
• Application Number:
  US07/465,826
• Time in Patent Office: 301 Days
• Field of Search: 370/58.3, 370/58.2, 370/62, 370/58.1, 370/92, 370/94.1, 370/60
• US Class Current: 370/355
• CPC Class Codes: H04Q 11/0407 using a stored programme control

Abstract

The invention provides a telecommunications system exhibiting an architecture having a plurality of functional levels decoupled from one another by data transport systems. The communication facilities connected to the periphery of the system are terminated at the physical level only and the data is channelized for transmission through a channel switch to a first level of processing that provides channel services. The data is then multiplexed and transmitted to system and call processing resources via a frame transport system.

Claims

1. A telecommunications system comprising:

first circuit means for providing physical terminations for communication facilities and for converting the data on the communication facilities to channelized data;

second circuit means comprising digital signal processing resources for providing protocol conversion channel services and message multiplexing of the channelized data;

a channel switch connected between the first and second circuit means for passing channelized data therebetween;

third circuit means for providing system control and call processing resources to the telecommunications system; and

a frame transport system for passing data between the second and third circuit means comprising a frame switch having a plurality of ports, the switch being adapted to route a message between any two of its ports in accordance with routing information contained in the message.

2. A telecommunications system as defined in claim 1 wherein the channel switch is a non-blocking circuit switching network.

3. A telecommunications system as defined in claim 2 wherein the channel switch is capable of switching contiguous nx64 Kb/s connections where n is an integer less than 25.

4. A telecommunications system as defined in claim 3 wherein the first circuit means includes means for controlling bandwidth allocation of the channelized data.

5. A telecommunications system as defined in claim 2 wherein the digital signal processing resources include a first digital signal processor for providing protocol conversion, a second digital signal processor for providing channel services and a third digital signal processor for providing message multiplexing.

6. A telecommunications system as defined in claim 5 wherein the frame switch, the channel switch and the second circuit means are interconnected with fiber optic data links.

7. A telecommunication system as defined in claim 1 and further comprising an interface circuit means connected to the frame transport system for providing physical terminations for communication facilities carrying packet data and for transceiving the data between the communication facilities and the frame transport system.

8. A telecommunications switching system comprising:

a frame switch having a plurality of ports, the switch being adapted to route a message between any two of its ports in accordance with routing information contained in the message;

a plurality of processors each one being accessible via a port on the frame switch;

one of the processors being suitably programmed to control the operation of the switching system and another one being suitably programmed to process telephone calls;

a channel switch adapted to receive channelized data and switch the data between predetermined ones of its input and output ports under control of one of the processors;

an interface circuit for connection to a plurality of communication facilities and for formatting the information on the communication facilities into channelized data compatible with the channel switch;

a transducer circuit connected between predetermined ports of the channel switch and at least one port of the frame switch for formatting the channelized data from the channel switch into packetized data compatible with the frame switch and for formatting the packetized data from the frame switch into channelized data compatible with the channel switch.

9. A telecommunications switching system as defined in claim 8 wherein the interface circuit includes means for stripping the signalling data from the data on the communication facilities and for channelizing it in a format suitable for transmission through the channel switch.

10. A telecommunications switching system as defined in claim 9 wherein the transducer circuit comprises means responsive to the signalling data for translating it to signalling information and for formatting it into messages suitable for transmission through the frame switch to the call processor.

11. A telecommunications switching system as defined in claim 10 wherein the channel switch is a non-defined blocking circuit switching network.

12. A telecommunications switching system as defined in claim 11 wherein the frame switch, the channel switch, the transducer circuit and the interface circuit are interconnected with fiber optic data links carrying data at the DS-512 level or a submultiple thereof.

13. A telecommunications system comprising, means for connecting the system to transmission facilities carrying data;

means for interfacing the transmission facilities at he physical level and for channelizing the data on the transmission facilities;

a digital signal processing means for providing channel services on the channelized data;

means for passing the channelized data between the interfacing and channelizing means to the digital signal processing means, thereby decoupling one from the other;

circuit means for providing system control and call processing resources; and

means for connecting the digital signal processing means to the circuit means for providing system control and call processing resources comprising a frame switch having a plurality of ports, the switch being adapted to route a message between any two of its ports in accordance with routing information contained in the message.

14. A telecommunications system as defined in claim 13 wherein the means for passing the channelized data between the interfacing and channelizing means to the digital signal processing means is a channel switching network.

15. A telecommunications system as defined in claim 14 wherein the channel switching network is nonblocking.

16. A telecommunications system as defined in claim 15 wherein the channel switching network may be controlled to carry nx64 Kb/s data on contiguous 64 Kb/s channels where n is an integer.

17. A telecommunications system as defined in claim 16 wherein the circuit means for providing system control and call processing resources comprises a plurality of processors each connected to a respective port of the frame switch.

18. A telecommunications system as defined in claim 16 and further comprising an interface communication facilities carrying packet data and for converting the packet data to a format compatible to that of the frame switch, the interface circuit means being connected to at least one port of the frame switch.