ATM-based distributed virtual tandem switching system
First Claim
1. An Asynchronous Transfer Mode (ATM) based distributed virtual tandem switching system, comprising:
- an ATM switching network;
a plurality of trunk interworking function (T-IWF) devices that receive end office voice trunks from TDM channels and convert the trunks to ATM cells, and receive ATM cells and convert the ATM cells to trunks for end offices; and
a centralized control and signaling interworking function (CS-IWF) device centrally serving the plurality of T-IWF devices, the CS-IWF device performing call control functions, providing a single connection between a narrowband signaling network and the ATM switching network, and interfacing narrowband and broadband signaling for call processing and control within the ATM switching network.
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Abstract
An Asynchronous Transfer Mode (ATM)-based distributed virtual tandem switching system is provided in which a network of ATM-based devices is combined to create a distributed virtual tandem switch. The system includes an ATM switching network that dynamically sets up individual switched virtual connections. The system also includes a trunk interworking function (T-IWF) device and a centralized control and signaling interworking function (CS-IWF) device. The trunk interworking function device converts end office voice trunks from TDM channels to ATM cells by employing a structured circuit emulation service. The centralized control and signaling interworking function device performs call control functions and interfaces narrowband signaling and broadband signaling for call processing and control within the ATM switching network. Consequently, the ATM based distributed virtual tandem switching system replaces a standard tandem switch in the PSTN.
86 Citations
49 Claims
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1. An Asynchronous Transfer Mode (ATM) based distributed virtual tandem switching system, comprising:
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an ATM switching network;
a plurality of trunk interworking function (T-IWF) devices that receive end office voice trunks from TDM channels and convert the trunks to ATM cells, and receive ATM cells and convert the ATM cells to trunks for end offices; and
a centralized control and signaling interworking function (CS-IWF) device centrally serving the plurality of T-IWF devices, the CS-IWF device performing call control functions, providing a single connection between a narrowband signaling network and the ATM switching network, and interfacing narrowband and broadband signaling for call processing and control within the ATM switching network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A call processing and control signal embodied on a carrier wave, the signal setting up a virtual connection across an ATM switching network for voice transport, the signal comprising:
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a narrowband format, transmitted from an end office via a signaling transfer point to a central CS-IWF device; and
a broadband format, derived from the narrowband format, transmitted from the CS-IWF device to an originating T-IWF device and to a destination T-IWF device via the ATM switching network.
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14. A method for transporting voice from an originating location to a destination across an Asynchronous Transfer Mode (ATM) network via an originating trunk interworking function (T-IWF) device and a terminating T-IWF device, the method comprising:
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transmitting the voice from the originating location to an originating trunk that leaves an end office switch;
converting the originating trunk to ATM cells;
interfacing between narrowband and broadband signaling at a central location for call processing and control within the ATM network;
transmitting the voice within the ATM cells across the ATM network utilizing the broadband signaling;
converting the ATM cells to a destination trunk; and
transmitting the voice from the destination trunk to the destination. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An Asynchronous Transfer Mode (ATM) based distributed virtual tandem switching system in which a network of ATM-based devices is combined to create a distributed virtual tandem switch, the system comprising:
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an ATM switching network that dynamically sets up individual switched virtual connections;
a trunk interworking function (T-IWF) device that converts end office voice trunks from TDM channels to ATM cells by employing a circuit emulation service; and
a centralized control and signaling interworking function (CS-IWF) device that performs call control functions and interfaces narrowband signaling and broadband signaling for call processing and control within the ATM switching network;
wherein the ATM based distributed virtual tandem switching system is adapted to comprise a virtual switch in a PSTN.
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26. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switch comprising:
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a centralized control and signaling inter-working function (CS-IWF) device that performs call control functions and converts between narrowband and broadband signaling for call processing and control within an ATM switching network;
a first trunk inter-working function (T-IWF) device that converts trunks from end office switches to ATM cells; and
a second trunk inter-working function (T-IWF) device that converts ATM cells to trunks for end office switches;
wherein telephone calls originating and terminating within an advanced intelligent network are transmitted through the ATM switching network. - View Dependent Claims (27, 28)
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29. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switch comprising:
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a centralized control and signaling inter-working function (CS-IWF) device that performs call control functions and converts between narrowband and broadband signaling for call processing and control within an ATM switching network;
wherein telephone calls originating and terminating within an advanced intelligent network are transmitted through the ATM switching network and are controlled, within the ATM switching network, by the CS-IWF device. - View Dependent Claims (30, 31, 32)
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33. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switching system comprising:
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an ATM switching network;
a first trunk inter-working function (T-IWF) device that converts trunks from end office switches to ATM cells;
a second trunk inter-working function (T-IWF) device that converts ATM cells to trunks for end office switches; and
a centralized control and signaling inter working function (CS-IWF) device that performs call control functions and converts between narrowband and broadband signaling for call processing and control within the ATM switching network, wherein the ATM distributed virtual tandem system functions like a standard tandem switch. - View Dependent Claims (34, 35)
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36. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switching system comprising:
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an ATM switching network;
a first trunk inter-working function (T-IWF) device that converts trunks from end office switches to ATM cells;
a second trunk inter-working function (T-IWF) device that converts ATM cells to trunks for end office switches;
an originating end office that originates a telephone call; and
a terminating end office that is the destination of the telephone call;
wherein telephone calls are transmitted from the originating end office to the terminating end office. Through the ATM switching network, within ATM cells. - View Dependent Claims (37)
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38. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switching system comprising:
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an originating end office that originates a telephone call and forward appropriate narrowband signaling for call processing and control within an advanced intelligent network;
a signaling transfer point that receives and forwards narrowband signaling for call processing and control within the advanced intelligent network; and
a centralized control and signaling interworking function (CS-IWF) device that performs call control functions and converts between narrowband and broadband signaling for call processing and control within an ATM switching network;
wherein the CS-IWF device receives narrowband signaling from the signaling transfer point and processes and controls the telephone call within the ATM switching network using broadband signaling based upon the received narrowband signaling. - View Dependent Claims (39, 40, 41)
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42. An Asynchronous Transfer Mode (ATM) distributed virtual tandem switching system comprising:
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an ATM switching network;
an originating end office that originates a telephone call;
a terminating end office that is the destination of the telephone call;
a first trunk inter-working function (T-IWF) device that converts trunks from end office switches to ATM cells;
a second trunk inter-working function (T-IWF) device that converts ATM cells to trunks for end office switches;
a signaling transfer point that receives and forwards narrowband signaling for call processing and control within an advanced intelligent network; and
a centralized control and signaling inter working function (CS-IWF) device that performs call control functions and converts between narrowband and broadband signaling for call processing and control within the ATM switching network;
wherein the ATM distributed virtual tandem system functions like a standard tandem switch. - View Dependent Claims (43, 44, 45)
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46. A method for converting voice traffic formats and setting up voice transmission across an Asynchronous Transfer Mode (ATM) network, the method comprising:
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converting an originating trunk ATM cells;
converting between narrowband signaling and broadband signaling for call processing and control within the ATM network; and
converting the ATM cells into a destination trunk. - View Dependent Claims (47)
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48. A method for transporting voice across an Asynchronous Transfer Mode (ATM) network, the method comprising:
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transmitting the voice from an originating location to an ATM network;
transmitting narrowband signaling to a centralized control and signaling interworking function (CS-IWF) device;
converting between narrowband and signaling and broadband signaling for call processing and control within the ATM network; and
forwarded the broadband signaling from the CS-IWF device to the ATM network. - View Dependent Claims (49)
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Specification