Broadband ISDN packet switching arrangements

• US 5,115,426 A
• Filed: 03/30/1990
• Issued: 05/19/1992
• Est. Priority Date: 03/30/1990
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: AT&T, Inc.
• Inventors: Spanke, Ronald A.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Marcelo, Melvin
• Application Number:
  US07/502,592
• Time in Patent Office: 781 Days
• Field of Search: 370/58.1, 370/60, 370/60.1, 370/94.1, 370/110.1
• US Class Current: 370/354
• CPC Class Codes: H04J 2203/0012 Switching modules and their interconnections
• CPC Class Codes: H04L 12/64 Hybrid switching systems
• CPC Class Codes: H04L 2012/564 Connection-oriented
• CPC Class Codes: H04L 2012/5664 Support of Video, e.g. MPEG
• CPC Class Codes: H04L 49/1553 Interconnection of ATM switching modules, e.g. ATM switching fabrics
• CPC Class Codes: H04L 49/206 Real Time traffic
• CPC Class Codes: H04L 49/254 Centralised controller, i.e. arbitration or scheduling
• CPC Class Codes: H04L 49/3009 Header conversion, routing tables or routing tags
• CPC Class Codes: H04L 49/309 Header conversion, routing tables or routing tags
• CPC Class Codes: H04L 49/50 Overload detection or protection within a single switching element
• CPC Class Codes: H04L 49/606 Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A broadband packet switch arrangement comprising a broadband packet unit connected to a plurality of customer lines and a video switch for selectively connecting packetized video signals from a plurality of video sources to the customer lines. The broadband packet switch unit selectively connects customer lines and transmits received control packets received from the customer lines to a control unit which responds to video request packets by controlling the video switch to connect selected video packets to the customers lines. Each customer line includes a selector circuit which receives video packets and inter-customer broadband ISDN packets and merges them onto the customer line. After the control unit has granted permission to connect a video source to a customer line, video source change requests for the line are sent directly to the video switch which responds thereto by connecting a requested video source to the customer line.

Claims

1. A packet switching arrangement comprising;

a packet switching network comprising a plurality of incoming lines for receiving customer packets from customers, a plurality of outgoing lines for conveying packetized information to said customers and means responsive to customer packets received on said incoming lines for selectively connecting said received customer packets to said outgoing lines;

a plurality of sources of video signal packets;

video switch means for selectively connecting ones of said video signal packets to said outgoing lines without being transmitted through said packet switching network; and

control means common to said packet switching network and said video switch means and responsive to control signals received from said incoming lines for controlling the connections provided by said packet switching network and said video switch means.

2. The arrangement of claim 1 wherein said packet switching network comprises means responsive to control packets received on said incoming lines for connecting said control packets to said control means;

and

said control means comprises means responsive to said control packets for controlling the connections provided by said packet switching network and said video switch means.

3. The arrangement of claim 1 wherein each of said outgoing lines comprises a selector means for receiving customer packets from said packet switching network and video signal packets from said video switch means and for selectively merging said customer packets and said video signal packets onto one of said outgoing lines.

4. The arrangement of claim 3 wherein said selector means interleaves said customer packets from said packet switching network and said video signal packets from said video switch means into a stream of packets on one of said outgoing lines.

5. The arrangement of claim 3 wherein said selector means of a first outgoing line comprises means for selectively connecting a video signal packet from said video switch means onto said first outgoing line whenever a video signal packet is present at said selector.

6. A packet switching arrangement comprising:

a packet switching network comprising a first communication path comprising a first input line and a first output line, a second communication path comprising a second input line and a second output line and means responsive to packets received on said first input line for selectively connecting said received packets to said second output line;

a plurality of sources of video signal packets;

video switch means for selectively connecting ones of said video signal packets to said second output line contemporaneously with the connection by said packet switching network of packets from said first input line to said second output line; and

means responsive to control packets received at said input lines for connecting said control packets to a control means;

said control means is common to said packet switching network and said video switch means and is responsive to said control packets for controlling the selective connection of said customer packets from said first input line to said second output line by said packet switching network and for controlling the selective connection of said video signal packets to said second output line by said video switch means.

7. The arrangement of claim 6 wherein said control packets comprise customer control packets received at said first input line and video control packets received at said second input line;

and

said control means is responsive to said customer control packets for controlling the selective connection of said customer packets from said first input line to said second output line and responsive to said video control packets for controlling the selective connection of said video signal packets to said second output line by said video switch means.

8. The arrangement of claim 6 wherein said second outgoing line comprises a selector means for receiving customer packets from said packet switching network and video signal packets from said video switch means and for selectively merging said customer packets from said packet switching network and said video signal packets from said video switching means onto said second outgoing line.

9. A video packet switching arrangement comprising:

video switch means connected to a plurality of customer access lines for selectively connecting video signal packets from a plurality of video sources to said customer access lines;

control means, responsive to a video service request packet received on one of said customer access lines, for sending connection permission signals to said video switch means;

means for connecting a video source identity packet received on said one customer access line to said video switch means, said video source identity packet identifying one of said video sources; and

said video switch means comprises means responsive to said permission signals and said video source identity packet for connecting video signal packets from said identified video source to said one customer access line.

10. The arrangement of claim 9 comprising a packet switch means for selectively connecting packets received on said customer access lines to other ones of said customer access lines and to said control means.

11. The arrangement of claim 9 said control means comprises means for recording the available bandwidth on said one customer access line and for sending said permission signals when the bandwidth available on said one access line exceeds the bandwidth required to convey video signal packets from one of said video sources.

12. A video packet switching arrangement comprising:

video switch means connected to a plurality of customer access lines for selectively connecting video signal packets from a plurality of video sources to said customer access lines;

control means, responsive to a video service request packet received on one of said customer access lines and identifying a first one of said video sources, for sending connection permission signals identifying said first video source to said video switch means;

said video switch means comprises means responsive to said connection permission signals for connecting said first video source to said one customer access line;

means for connecting a video source change packet received on said one customer access line to said video switch means, said video source change packet identifying a second one of said video sources; and

said video switch means comprises means responsive to said connection permission signals and said video source change packet for disconnecting said first video source from said one customer access line and for connecting video signal packets from said second video source to said one customer access line.

13. The arrangement of claim 12 wherein said first means for connecting comprises a packet switch means for selectively connecting packets received on said customer access lines to other ones of said customer access lines and to said first control means.

14. The arrangement of claim 13 wherein said first control means comprises means for recording the available bandwidth on said one customer access line and for sending said connection permission signals when the bandwidth available on said one access line exceeds the bandwidth required to convey video signal packets from said first video source.

15. A packet switching arrangement for providing packet switched interconnection among a plurality of customer access lines and for providing packet switched video services to said customer access lines, comprising:

broadband packet switch means connected to said customer access lines for selectively connecting customer packets between said customer access lines;

a video switch means for selectively connecting video signal packets from a plurality of video sources to said customer access lines;

means in said broadband packet switch means for connecting a video service request packet received on one of said customer access lines to a bandwidth allocation controller;

said bandwidth allocation controller comprising means responsive to said video service request packet for granting permission to said video switch means for the connection of video signal packets to said one customer access line;

means, in said broadband switch means, responsive to a video source request packet received on said customer access line and identifying one of said video sources for connecting said video source request packet to said video switch means; and

said video switch means comprises means responsive to said video source request packet and to the grant of permission by said bandwidth allocation controller for connecting packets from said identified video source to said one customer access line.

16. A broadband switching module comprising:

a broadband switch unit comprising interface means connected to a plurality of incoming and outgoing lines and broadband packet switch means for selectively connecting broadband packets received on said incoming lines to said outgoing lines;

video switch means operable for connecting to any one of said outgoing lines any one of a plurality of video signals receivable from a plurality of video sources;

video switch control means responsive to a receipt of permission signals for operating said video switch means to establish video switch connections from one of said plurality of video sources to one of said outgoing lines and further responsive to channel change signals received on one of said incoming lines for connecting another of said video sources to said one outgoing line; and

a bandwidth allocation control unit responsive to control signals received on said incoming lines for generating said permission signals.

17. The module of claim 16 wherein said interface means comprises selector means for selecting packets from said broadband packet switch means and from said video switch means for transmission on each of said outgoing lines.