Arrangements for switching multiple packet types combined in a single packet stream

• US 5,115,427 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: Johnson, James M. Jr., Spanke, Ronald A.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Ton, Dang T.
• Application Number:
  US07/502,352
• Time in Patent Office: 781 Days
• Field of Search: 370/60, 370/94.1, 370/58.1, 370/112
• US Class Current: 370/391
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An arrangement for switching broadband ISDN (B-ISDN) packets is disclosed. The arrangement comprises a broadband packet switch connected to B-ISDN customers and to a narrowband switch via an interface unit. B-ISDN control packets are connected by the broadband packet switch to the narrowband switch which transmits them to a control unit. The control unit responds to control messages by controlling the broadband packet switch to selectively interconnect B-ISDN customers and by controlling the broadband packet switch, the interface means and the narrowband switch to selectively interconnect B-ISDN and narrowband customers.

Claims

1. A packet switching arrangement comprising:

a broadband packet switch means, connected to a plurality of broadband customer lines and to a narrowband switch means, for selectively connecting broadband packets among said broadband customer lines and said narrowband switch means;

means in said broadband switch means responsive to a broadband service request packet from a first broadband customer line requesting a packet communication between said first broadband customer line and a second broadband customer line for connecting said service request packet to said narrowband switch means;

said service request packet comprises a predetermined signaling virtual channel identifier;

said broadband packet switch means comprises means responsive to said signaling virtual channel identifier for connecting said service request packet to said narrowband switch means;

said narrowband switch means comprises means responsive to said service request packet for connecting said service request packet to a control means; and

said control means is responsive to said service request packet for controlling said broadband packet switch means to selectively connect packets comprising said requested packet communication between said first broadband customer line and said second broadband customer line.

2. The arrangement of claim 1 wherein said service request packet includes a first predetermined signaling virtual channel identifier identifying said service request packet and said broadband packet switch means comprises means responsive to said first signaling virtual channel identifier for replacing said first signaling virtual channel identifier with a second predetermined signaling virtual channel identifier and for connecting said service request packet comprising said second signaling virtual channel identifier to said narrowband switch means.

3. The arrangement of claim 2 comprising means in said narrowband switch means responsive to said second signaling virtual channel identifier for connecting said service request packet to said control means.

4. The arrangement of claim 1 wherein each of said broadband packets comprises a virtual channel identifier and said control means comprises means responsive to said service request packet for selecting a first virtual channel identifier at said first customer line for broadband packets comprising said requested communication and for selecting a second virtual channel identifier at said second customer line for broadband packets comprising said requested communication;

means for transmitting to said first and said second customer lines the identities of said first and said second virtual channel identifiers; and

means for controlling said broadband switch means to connect broadband packets including said first virtual channel identifier received from said first customer line to said second customer line and to connect broadband packets including said second virtual channel identifier received from said second customer line to said first customer line.

5. The arrangement of claim 4 wherein said transmitting means comprises means for transmitting a packet identifying said first virtual channel identifier to said first customer line via said narrowband switch means and said broadband packet switch means;

and

means for transmitting a packet identifying said second virtual channel identifier to said second customer line via said narrowband switch means and said braodband packet switch means.

6. The arrangement of claim 1 wherein said broadband packet switch means comprises storage means for storing connection control information and means responsive to said connection control information for selectively connecting received packets among said customer lines;

and

said control means comprises means responsive to said service request packet for writing connection control information in said storage means to effect said requested communication between said first and said second customer lines.

7. The arrangement of claim 1 wherein said broadband switch means comprises a translation table, and said control means comprises means for writing into said translation table information associating said second customer line with packets received from said first customer line comprising said first virtual channel identifier, and information associating said first customer line with packets received from said second customer line comprising said second virtual channel identifier;

and

said broadband packet switch means responsive to said translation table information for connecting packets received from said first customer line comprising said first virtual channel identifier to said second customer line, and for connecting packets received from said second customer line comprising said second virtual channel identifier to said first customer line.

8. The arrangement of claim 1 wherein said narrowband switch means comprises means for selectively connecting packetized representations of signals from a plurality of narrowband customers to said broadband packet switch means.

9. A packet switching arrangement comprising;

a broadband packet switch means, connected to a plurality of broadband customers and to a narrowband switch means connected to a plurality of narrowband customers, for selectively connecting broadband packets among said broadband customers and said narrowband switch means;

said call set up packet comprises a predetermined signaling virtual channel identifier;

said broadband packet switch means comprises means responsive to said signaling virtual channel identifier for connecting said call set up packet to said narrowband switch means;

said narrowband switch means comprises means responsive to said call set up packet for connecting said call set up packet to a control means; and

said control means is responsive to said call set up packet for controlling said broadband packet switch means and said narrowband switch means to selectively connect packets comprising said requested packet communication between said one broadband customer and said one narrowband customer.

10. The arrangement of claim 9 comprising means in said narrowband switch unit, responsive to said signaling virtual channel identifier for connecting said call set up packet to said control means.

11. The arrangement of claim 9 wherein each of said broadband packets comprises a virtual channel identifier and said control means comprises means responsive to said call set up packet for selecting a first virtual channel identifier at said one broadband customer for broadband packets comprising said requested communication and for selecting a second virtual channel identifier at said narrowband switch means for broadband packets comprising said requested communication;

means for transmitting to said one broadband customer and said narrowband switch means the identities of said first and said second virtual channel identifiers; and

means for controlling said broadband switch means to connect broadband packets including said first virtual channel identifier received from said one broadband customer to said narrowband switch means and to connect broadband packets including said second virtual channel identifier received from said narrowband switch means to said one broadband customer.

12. The arrangement of claim 11 wherein said narrowband switch means comprises:

circuit switch means connected to said plurality of narrowband customers and comprising a plurality of inputs and interface means for selectively connecting representations of received broadband packets comprising said second virtual channel identifier to a predetermined input of said circuit switch means; and

said circuit switch means comprises means for connecting said predetermined circuit switch input to said one narrowband customer.

13. The arrangement of claim 12 wherein said circuit switch means comprises a plurality of circuit switch outputs and means for selectively connecting said one narrowband customer to a predetermined one of said circuit switch outputs;

and

said interface means comprises means for transmitting to said broadband packet switch means a broadband packet comprising said second virtual channel identifier and information received from said one narrowband customer.

14. The arrangement of claim 11 wherein said transmitting means comprises:

means for transmitting a packet identifying said first virtual channel identifier to said one broadband customer via said narrowband switch means and said broadband packet switch means; and

means for transmitting information identifying said second virtual channel identifier to said narrowband switch means.

15. The arrangement of claim 9 wherein said broadband switch means comprises storage means for storing connection control information and means responsive to said connection control information for selectively connecting said received packets to ones of said customers;

said control means comprises means responsive to said call set up packet for writing connection control information in said storage means to selectively effect said requested communication between said one broadband customer and said narrowband switch means.

16. The arrangement of claim 9 wherein said narrowband switch means comprises an interface means and a circuit switch means connected to said narrowband customers;

said interface means comprising means for exchanging broadband packets with said broadband switch means, means for coupling representations of said broadband packets from said broadband packet switch means to said circuit switch means and means for conveying information received from said circuit switch means to said broadband packet switch.

17. The arrangement of claim 16 wherein said control means comprises means responsive to said call set up packet for effecting said requested communication by controlling said broadband packet switch means, said interface means and said circuit switch means.

18. A packet switching arrangement comprising;

a broadband packet switch means, connected to a plurality of broadband customers and to a narrowband switch means connected to a plurality of narrowband customers, for selectively connecting broadband packets among said broadband customers and said narrowband switch means, each of said broadband packets comprising a virtual channel identifier;

means in said narrowband switch means for connecting a call set up message received from one of said narrowband customers, requesting a communication between said one narrowband customer and an identified one of said broadband customers, to a control means;

said control means is responsive to said call set up message for controlling said broadband packet switch means and said narrowband switch means to selectively connect packets comprising said requested communication between said one broadband customer and said one narrowband customer;

said control means comprises means responsive to said call set up message for selecting a first virtual channel identifier at said one broadband customer for broadband packets comprising said requested communication and for selecting a second virtual channel identifier at said narrowband switch means for broadband packets comprising said requested communication;

means for transmitting to said one broadband customer and said narrowband switch means the identities of said first and said second virtual channel identifiers; and

means for controlling said broadband switch means to connect broadband packets including said first virtual channel identifier received from said one broadband customer to said narrowband switch means and to connect broadband packets including said second virtual channel identifier received from said narrowband switch means to said one broadband customer.

19. The arrangement of claim 18 wherein said narrowband switch means comprises:

circuit switch means connected to said plurality of narrowband customers and comprising a plurality of inputs and interface means for selectively connecting representations of received broadband packets comprising said second virtual channel identifier to a predetermined input of said circuit switch means; and

said circuit switch means comprises means for connecting said predetermined circuit switch input to said one narrowband customer.

20. The arrangement of claim 19 wherein said circuit switch means comprises a plurality of circuit switch outputs and means for selectively connecting said one narrowband customer to a predetermined one of said circuit switch outputs;

and

said interface means comprises means for transmitting to said broadband packet switch means a broadband packet comprising said second virtual channel identifier and information received from said one narrowband customer.

21. An arrangement for switching B-ISDN packets each comprising a virtual channel identifier, said arrangement comprising:

a B-ISDN packet switch means, connected to a plurality of B-ISDN customers and to a narrowband switch means, for selectively connecting B-ISDN packets among said B-ISDN customers and said narrowband switch means;

means in said B-ISDN switch means responsive to a B-ISDN call set up packet requesting a B-ISDN packet communication between first and second ones of said B-ISDN customers for connecting said B-ISDN call set up packet to said narrowband switch means;

said narrowband switch means comprises means responsive to said B-ISDN call set up packet for generating a narrowband representation of said B-ISDN call set up packet and means for connecting said narrowband representation of said call set up packet to a control means;

said control means comprises means responsive to said narrowband representation of said call set up packet for selecting a first virtual channel identifier at said first customer for B-ISDN packets comprising said requested communication and for selecting a second virtual channel identifier at said second customer for B-ISDN packets comprising said requested communication;

means for transmitting to said first and said second customers the identities of said first and said second virtual channel identifiers; and

means for controlling said B-ISDN packet switch means to connect B-ISDN packets including said first virtual channel identifier received from said first customer to said second customer and to connect B-ISDN packets including said second virtual channel identifier received from said second customer to said first customer.

22. An arrangement for switching B-ISDN packets each comprising a virtual channel identifier, said arrangement comprising:

a B-ISDN packet switch means, connected to a plurality of B-ISDN customers and to a narrowband switch means connected to a plurality of narrowband customers, for selectively connecting B-ISDN packets among said broadband customers and said narrowband switch means;

means in said B-ISDN switch means responsive to a B-ISDN call set up packet requesting a packet communication between one of said B-ISDN customers and one of said narrowband customers for connecting said B-ISDN call set up packet to said narrowband switch means;

said narrowband switch means comprises means responsive to said B-ISDN call set up packet for generating a narrowband representation thereof and means for connecting said narrowband representation of said call set up packet to a control means;

said control means comprises means responsive to said narrowband representation of said call set up packet for selecting a first virtual channel identifier at said one B-ISDN customer for B-ISDN packets comprising said requested communication and for selecting a second virtual channel identifier at said narrowband switch means for B-ISDN packets comprising said requested communication;

means for transmitting to said one B-ISDN customer and said narrowband switch means the identities of said first and said second virtual channel identifiers; and

means for controlling said broadband packet switch means to connect B-ISDN packets including said first virtual channel identifier received from said one B-ISDN customer to said narrowband switch means and to connect B-ISDN packets including said second virtual channel identifier received from said narrowband switch means to said one B-ISDN customer.

23. An arrangement for switching B-ISDN packets each comprising a virtual channel identifier, said arrangement comprising:

a B-ISDN packet switch means, connected to a plurality of B-ISDN customers and to a narrowband switch means connected to a plurality of narrowband customers, for selectively connecting B-ISDN packets among said B-ISDN customers and said narrowband switch means;

means in said narrowband switch means for connecting a call set up message received from one of said narrowband customers, requesting a communication between said one narrowband customer and an identified one of said B-ISDN customers to a control means;

said control means comprises means responsive to said call set up message for selecting a first virtual channel identifier at said one B-ISDN customer for B-ISDN packets comprising said requested communication and for selecting a second virtual channel identifier at said narrowband switch means for B-ISDN packets comprising said requested communication;

means for transmitting to said one B-ISDN customer and said narrowband switch means the identities of said first and said second virtual channel identifiers; and

means for controlling said B-ISDN packet switch means to connect B-ISDN packets including said first virtual channel identifier received from said one B-ISDN customer to said narrowband switch means and to connect B-ISDN packets including said second virtual channel identifier received from said narrowband switch means to said one B-ISDN customer.