Method and apparatus for providing real-time switching of high bandwidth transmission channels

• US 5,042,062 A
• Filed: 10/23/1989
• Issued: 08/20/1991
• Est. Priority Date: 10/23/1989
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.), Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Original Assignee: AT&T, Inc.
• Inventors: Smith, Donald E., O'Reilly, Gerard P., Leighton, James M., Lee, Robert C.
• Primary Examiner(s): Dwyer, James L.
• Application Number:
  US07/425,644
• Time in Patent Office: 666 Days
• Field of Search: 379/53, 379/54, 379/94, 379/219, 358/85, 370/84, 370/58.2, 370/58.3
• US Class Current: 348/14.11
• CPC Class Codes: H04J 2203/0064 Admission Control
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

Broadband terminals, such as video terminals and a video conferencing system, are directly connected to broadband digital access crossconnect systems and connections between the terminals are established via the crossconnects and DS1 or DS3 interconnecting links under control of telephone exchanges associated with the different crossconnects. A broadband terminal is connected to an associated exchange, as well as, a crossconnect and a connection from one terminal to another may be requested by transmitting a special code to the exchange together with a directory number assigned to the desired broadband terminal. The central office, on the basis of the directory number, area code and exchange code, selects a broadband interconnecting link from the crossconnect to which the originating terminal is connected to the crossconnect to which the terminating terminal is connected. Furthermore, the originating exchange transmits the identity of the selected link and the directory number via a common channel signaling system to the exchange associated with the requested terminal. Both the originating and terminating exchanges transmit connect messages to their associated crossconnects to establish a broadband path between the two terminals.

Claims

1. In a telecommunications system, an arrangement for providing a real-time switched broadband connection between broadband terminals, comprising:

at least one telephone exchange;

a broadband interconnection device connected to said exchange by a communication means for transmitting data messages, and responsive to control commands in said data messages for selectively interconnecting broadband transmission links;

means for transmitting to said exchange a connection request message from a first broadband terminal connected to said device via a first broadband link;

said exchange responsive to a connection request from said first terminal defining a second terminal connected to said device via a second broadband link, for transmitting to said device via said communication means a data message including a control command defining said first and second links;

said interconnection device responsive to said control command for establishing a path between said first and said second links.

2. In a telecommunications system, an arrangement for providing a switched broadband connection, comprising:

at least one telephone exchange;

at least one broadband interconnection device;

means for transmitting to said exchange a connection request message from a broadband terminal connected to said device; and

means for communicating data messages including control commands from said exchange to said device;

said device comprising terminal ports for connection to broadband terminals, link ports for connection to broadband interconnection links to other broadband interconnection devices and port interconnection means responsive to control commands for selectively establishing interconnecting paths between ports defined by said control commands;

said exchange responsive to a connection request from a terminal connected to one of said terminal ports, for selecting one of said link ports for connection to another interconnection device and for transmitting via said transmitting means to said at least one device a data message including a control command defining said one of said terminal ports and said selected one of said link ports;

said port interconnection means responsive to said control command for establishing a path from said one of said terminal ports to said selected one of said link ports;

whereby a telephone exchange connected to a broadband interconnection device is responsive to a request from a broadband terminal connected to said connected device via said data message to select an interswitch link between broadband interconnection devices and to control the connected device to establish the required connections to the selected link.

3. The arrangement in accordance with claim 2 wherein said exchange has a plurality of subscriber lines connected thereto and said means for transmitting comprises one of said subscriber lines.

4. The arrangement in accordance with claim 2 and further comprising an additional exchange and an additional broadband interconnection device connected to said additional exchange;

means for transmitting data messages including control commands from said additional exchange to said additional device;

said additional device comprising a terminal port for connection to a broadband terminal and a link port for connection to a broadband link interconnecting said at least one device and said additional device and port interconnection means responsive to said data messages including control commands for selectively establishing an interconnecting path between said terminal port of said additional device and said link port of said additional device; and

wherein said at least one exchange is further responsive to said connection request to transmit to said additional exchange information defining said selected link and terminal identity information defined by said request message, to said additional exchange;

said additional exchange responsive to said information transmitted by said at least one exchange to transmit to said additional device one of said data messages including a connect command identifying said terminal port of said additional device and said link port of said additional device; and

said port interconnection means of said additional device responsive to said connect command from said additional exchange to establish an interconnecting path between said terminal port of said additional device and said link port of said additional device.

5. The arrangement in accordance with claim 4 and further comprising a signaling interconnection system for interconnecting said at least one exchange and said additional exchange and wherein said at least one exchange transmits said information defining said selected link and said terminal identity information to said additional exchange via said signaling system.

6. The arrangement in accordance with claim 5 further comprising originating and terminating terminal equipment and broadband data links connecting said originating and terminating terminal equipment to said at least one and said additional devices, respectively;

said originating terminal equipment further comprising signaling means for connection to said at least one exchange for transmitting said connection request to said at least one exchange.

7. The arrangement in accordance with claim 6, wherein said signaling means in said originating terminal equipment comprises a subscriber line connected to said at least one exchange and means for transmitting a special code signifying a request for broadband services to said at least one exchange.

8. In a telecommunications system, an arrangement for providing a switched broadband connection, comprising:

at least one telephone exchange;

at least one broadband interconnection device;

means for transmitting to said exchange a connection request message from a broadband terminal connected to said device; and

means for transmitting control commands from said exchange to said device;

said device comprising terminal ports for connection to broadband terminals, link ports for connection to broadband interconnection links to other broadband interconnection devices and port interconnection means responsive to control commands for selectively establishing interconnecting paths between ports defined by said control commands;

said exchange responsive to a connection request from a terminal connected to one of said terminal ports, for selecting one of said link ports for connection to another interconnection device and for transmitting to said at least one device a control command defining said one of said terminal ports and said selected one of said link ports;

said port interconnection means responsive to said control command for establishing a path from said one of said terminal ports to said selected one of said link ports;

said at least one exchange comprises memory means for storing data defining the identity of one or more interconnecting links interconnecting said at least one device and said additional device, and processor means responsive to a connection request from said terminal connected to said one port including a directory number defining a destination terminal and including a code identifying said additional exchange, to select on the basis of said code identifying said additional exchange an interconnecting link between said at least one device and said additional device from links identified by data stored in said memory means and for including at least one part of said directory number in said information transmitted to said additional exchange;

an additional exchange and an additional broadband interconnection device connected to said additional exchange;

said additional exchange comprising memory means for storing data defining a terminal port in association with said at least one part of directory number and a link port associated with said information defining said selected link, and processor means responsive to said information transmitted to said additional exchange to transmit to said additional device a connect message including data defining said terminal port and said link port identified by data in said memory means of said additional exchange;

said additional device comprising a terminal port for connection to a broadband terminal and a link port for connection to a broadband link interconnecting said at least one device and said additional device and port interconnection means responsive to control commands for selectively establishing an interconnecting path between said terminal port of said additional device and said link port of said additional device; and

wherein said at least one exchange is further responsive to said connection request to transmit to said additional exchange information defining said selected link and terminal identity information defined by said request message, to said additional exchange;

said additional exchange responsive to said information transmitted by said at least one exchange to transmit to said additional device a connect command identifying said terminal port of said additional device and said link port of said additional device; and

said port interconnection means of said additional device responsive to said connect command from said additional exchange to establish an interconnecting path between said terminal port of said additional device and said link port of said additional device;

whereby a telephone exchange connected to a broadband interconnection device is responsive to a request from a broadband terminal connected to said connected device to select an interswitch link between broadband interconnection devices and to control the connected device to establish the required connections to the selected link.

9. An arrangement for establishing a real-time switched connection among broadband terminals, comprising:

a first and a second telephone exchange;

signaling transmission means interconnecting said first and said second telephone exchanges;

a first and a second broadband crossconnect system, each for establishing broadband paths between interconnecting broadband links;

a first data link for transmission of data messages including control information between said first exchange and said first crossconnect system;

a second data link for transmission of data messages including control information between said second exchange and said second crossconnect system;

first and second video terminals connected via broadband terminal links to said first and said second crossconnect systems, respectively, and each having an assigned directory number;

a plurality of broadband interconnecting links interconnecting said first and said second crossconnect systems;

a customer telephone terminal associated with said first broadband terminal and connected to said first exchange;

said first telephone exchange responsive to a connection request from said customer telephone terminal including a directory number identifying said second broadband terminal, to select one of said interconnecting links for the transmission of broadband signals between said first and said second crossconnect systems and to transmit to said second exchange via said signaling transmission means, connection information including codes defining said directory number and said selected link;

said first exchange further responsive to said connection request for transmitting at least one of said data messages including control information to said first crossconnect system for controlling said first crossconnect system to establish a broadband interconnecting path between said first broadband terminal and said selected link; and

said second exchange responsive to said connection information to transmit to said second crossconnect system at least one of said data messages including control information for controlling said second crossconnect system to establish a broadband interconnecting path between said selected link and said second broadband terminal.

10. A telecommunication system comprising:

a plurality of interconnected telephone exchanges;

a plurality of broadband switches each having terminal ports for connection to broadband terminals and link ports for connection to links interconnecting said switches;

one of said switches connected by a data link to one of said exchanges and responsive to data messages including control commands from said one exchange for establishing interconnections among ones of said terminal ports and said link ports and another of said switches connected by another data link to another of said exchanges and responsive to data messages including control commands from said other exchange for establishing connections among said terminal ports and said link ports;

said one exchange responsive to a connection request from a terminal connected to one of said terminal ports of said one switch defining a terminal connected to one of said terminal ports of said other switch, by sending one of said data messages including a control command to said one switch to interconnect said one of said terminal ports of said one switch and a selected one of said interconnecting links and for transmitting to said other exchange information representing a request for interconnection of said selected interconnection link and said defined terminal;

said other exchange responsive to said information by sending one of said data messages including a control command to said other switch to interconnect said selected interconnection link and said defined terminal.

11. In a telecommunication system comprising a plurality of telephone exchanges and a plurality of broadband interconnection devices interconnected by a plurality of broadband transmission links, and each of said devices connected to at least one of said exchanges by a data bus, a method of completing a connection between broadband terminals connected to said devices comprising the steps of:

receiving a connection request at a first one of said exchanges from a first terminal connected to a first one of said devices, representing a request for interconnection of said one terminal and a second terminal defined in said request and connected to a second one of said devices;

in response to said connection request, selecting in said first exchange an interconnecting link interconnecting said first and said second devices;

transmitting information identifying said second terminal and said selected link from said first to said second exchange;

transmitting a data message including a connect command from said first exchange to said first device defining connections to said first terminal and to said selected interconnecting link;

transmitting a data message including a connect command from said second exchange to said second device defining connections to said second terminal and said interconnecting link; and

establishing an interconnecting path between said first terminal and said selected interconnecting link in said first device and establishing an interconnecting path between said selected interconnecting link and said second terminal in said second device responsive to said data messages.

12. The method in accordance with claim 11 wherein said step of selecting includes executing in said first exchange the step of choosing a first link from a plurality of interconnecting links between said first and said second devices and the step of determining the availability of the first chosen link and choosing an alternate link if the first chosen link is not available.

14. The method in accordance with claim 11 wherein the method, before the step of receiving a connection request, includes the step of transmitting from said first terminal to said first exchange a connection request message including information identifying said second terminal and said second exchange, and wherein said step of selecting comprises selecting an interconnecting link on the basis of said information identifying said second exchange and said step of transmitting information from said first to said second exchange includes transmitting a message via an interexchange signaling network wherein the address associated with the message corresponds to said information identifying said second exchange.

15. The method in accordance with claim 11 wherein said step of transmitting a connect command from said first exchange to said first device is executed prior to the step of transmitting the information from said first to said second exchange and further includes the step of transmitting a response message from said first device to said first exchange and repeating the step of selecting an interconnecting link if the response message indicates that a previously selected link is unavailable.

13. In a telecommunication system comprising a plurality of telephone exchanges and a plurality of broadband interconnection devices interconnected by a plurality of broadband transmission links, and each of said devices connected to at least one of said exchanges, a method of completing a connection between broadband terminals connected to said devices comprising the steps of:

storing in said exchange data defining the availability of interconnecting links from said first device to said second device;

receiving a connection request at a first one of said exchanges from a first terminal connected to a first one of said devices, representing a request for interconnection of said one terminal;

transmitting information identifying said second terminal and said selected link from said first to said second exchange;

transmitting a connect command from said first exchange to said first device defining connections to said first terminal and to said selected interconnecting link;

transmitting a connect command from said second exchange to said second device defining connections to said second terminal and said interconnecting link; and

establishing an interconnecting path between said first terminal and said selected interconnecting link in said first device and establishing an interconnecting path between said selected interconnecting link and said second terminal in said second device, and a second terminal defined in said request and connected to a second one of said devices;

in response to said connection request, selecting in said first exchange an interconnecting link interconnecting said first and second devices, said selecting step including executing in said first exchange the step of choosing a first link from a plurality of interconnecting links between said first and second devices and determining the availability of the first chosen link and choosing an alternate link if the first chosen link is not available by reading said table to determine availability of individual links of said plurality of interconnecting links; and

updating said table each time a link is selected.

16. A telecommunication exchange comprising:

control signal receiving means for receiving a connection request from a broadband terminal;

control signal transmission means for transmitting a connection command to at least one broadband interconnection device, said interconnection device for interconnecting broadband transmission links;

signaling means for connection to other exchanges;

memory means for storing data defining relations between broadband terminal identifications codes and codes defining broadband terminal connections to a broadband interconnection device and for storing data defining broadband interconnecting links interconnecting a plurality of broadband interconnection devices;

control means responsive to a connection request received on said control signal receiving means from one broadband terminal connected to said at least one broadband interconnection device and defining a code signifying a request for broadband services and a code specifying a directory number for another broadband terminal, including an exchange code designating a telecommunication exchange associated with said other broadband terminal, for selecting an interconnecting link between said at least one interconnection device and an interconnection device associated with said other broadband terminal, based on said data defining said relations and interconnecting links, and for transmitting said directory number and information identifying said selected interconnecting link to said exchange associated with said other broadband terminal via said signaling means;

said control means further responsive to said connection request to transmit to said at least one interconnection device, via said control signal transmission means, a connection command identifying said one terminal and said selected link and instructing said at least one interconnection device to interconnect said one terminal and said selected link.