Line card for supporting circuit and packet switching

• US 6,807,167 B1
• Filed: 03/08/2000
• Issued: 10/19/2004
• Est. Priority Date: 03/08/2000
• Status: Expired due to Term

• Current Assignee: Nokia of America Corporation (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Chakrabarti, Satyabrata, Amitabh, Mishra
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Fox, Jamal A.
• Application Number:
  US09/520,557
• Time in Patent Office: 1,686 Days
• Field of Search: 370/351, 370/352, 370/353, 370/354, 370/355, 370/356, 370/357, 370/389, 370/463, 370/419, 370/420, 370/421, 370/466, 370/467, 709/250
• US Class Current: 370/352
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/5615 Network termination, e.g. NT1, NT2, PBX
• CPC Class Codes: H04L 2012/5663 Support of N-ISDN

Abstract

A line card for supporting both circuit switching and packet switching is provided. The line card interfaces asynchronous communications and synchronous communications using a ATM switch and a Synchronous to Asynchronous Converter-Time Slot Interchange (SAC-TSI) that allows TDM traffic to be routed into the ATM fabric of the ATM switch. The line card supports video, voice and data communications. The line card further supports ATM, ethernet and frame relay communications.

Claims

1. A line card comprising:

a plurality of connection points for connecting to communication devices having a plurality of communication protocols;

a first set of the plurality of connection points connected to a time division multiplex bus on the line card;

a synchronous to asynchronous converter also connected to the time division multiplex bus;

a processor group connected to the time division multiplex bus in order to control a flow of time division multiplexed information to and from the first set of connection points;

a second set of the plurality of connection points connected to a PCI bus on the line card;

a first bridge having a first port connected to the PCI bus on the line card;

the first bridge having a second port connected to a central bus on the line card;

the central bus connected to the processor group to control a flow of information to and from the PCI bus;

the central bus connected through a backplane bridge to a connection point with a backplane PCI bus;

a third set of the plurality of connection points connected to an asynchronous transfer mode output bus on the line card;

the asynchronous transfer mode output bus connected to an asynchronous transfer mode switch on the line card;

the asynchronous transfer mode switch connected through a bus interface to a connection point with a backplane asynchronous transfer mode bus;

the asynchronous transfer mode switch connected to the synchronous-asynchronous converter by a bus; and

the asynchronous transfer mode switch connected to two universal test and operations interfaces for ATM (UTOPIA) portions of the processor group by two asynchronous transfer mode switch buses;

wherein time division multiplexed information received at one of the first set of connection points is communicated to the synchronous-asynchronous converter where the time division multiplexed information is converted into asynchronous transfer mode information, then the information is communicated to the asynchronous transfer mode switch from which the asynchronous transfer mode information is communicated by the asynchronous transfer mode output bus to the third set of the plurality of connection points.

2. The line card of claim 1 wherein the backplane PCI bus is a compact PCI bus.

3. The line card of claim 1, wherein one of the first set of connection points, one of the second set of connection points and one of the third set of connection points are terminals of a slot for connection with an electronic card to provide better functionality.

4. The line card of claim 3, wherein the electronic card connects to a PCI bus having a clock rate of at least 33 megahertz.

5. The line card of claim 3, wherein the electronic card is a mezzanine card.

6. The line card of claim 1, wherein:

one of the first set of connection points, one of the second set of connection points and one of the third set of connection points are terminals of a slot for connection with an electronic card; and

a digital signal processing electronic card is connected to the slot to provide signal processing of asynchronous transfer mode information.

7. The line card of claim 1, wherein:

one of the first set of connection points, one of the second set of connection points and one of the third set of connection points are terminals of a slot for connection with an electronic card;

a digital signal processing electronic card is connected to the slot; and

a public switched telephone network is connected to the digital signal processing electronic card;

the public switched telephone network communicates information to and from the digital signal processing electronic card in frames.

8. The line card of claim 7, wherein:

the digital signal processing electronic card performs enhanced variable rate codec processing on the frames and places the processed frames on the time division multiplex bus; and

the frames are then transferred from the time division multiplex bus to the bus interface unit and subsequently to the asynchronous transfer mode switch;

the frames are then sent from the asynchronous mode switch to the T1/E1 interface card through the asynchronous transfer output bus.

9. The line card of claim 8, wherein the T1/E1 interface card connects to the public switched telephone network and communicates frame information to the public switched telephone network.

10. The line card of claim 1, wherein:

the bus interface receives frames of voice communications from the asynchronous transfer mode backplane bus from an external network and converts the frames of information into a format compatible with the line card;

the processed frames are transferred to the asynchronous transfer switch by the UTOPIA portions of the processor group;

the UTOPIA portion of the processor group provides additional processing of the frames and communicates the twice processed frames to the processor portion of the processor group;

the processor portion of the processor group transfers the twice processed frames to the digital signal processor through the local bridge;

the digital signal processor performs enhanced variable rate codec processing of the twice processed frame information and thereby provides a three times processed frames of information; and

the three times processed frames of information are communicated through the asynchronous transfer mode switch to a T1/E1 converter electronic card which completes the processing of the frames of information and communicates them to the public switched telephone network.

11. The line card as recited in claim 10 wherein the frames of information carried multimedia information.

12. The line card as recited in claim 10 wherein the frames of information carried multimedia information and the multimedia information was a voice.

13. The line card as recited in claim 10 wherein the frames of information carried multimedia information and the information was video.

14. The line card as recited in claim 10 wherein the frames of information carried multimedia information and the information was data.

15. The line card as recited in claim 1 further comprising:

an interface circuit for providing an interface between high speed applications, wherein the high speed applications comprise of asynchronous transfer mode, ethernet and frame relay.