Network switching system with asynchronous and isochronous interface
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Abstract
To provide a switching system with telephone switching function mainly on the basis of hardware processing by using isochronous channel which is a real time communication channel. The switching system comprises a gateway node connected with ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network), and one or more extension nodes, and a serial bus such as IEEE 1394 bus. The gateway node transforms data rate of outside line into data rate of extension node, and the other way around, and secure a seamless communication channel. Concretely, the gateway node secures an isochronous channel, according to a request from the extension nodes or the outside line, and executes switching such as transfer or reservation. A resource manager holds a table for managing the gateway node and extension node.
15 Citations
23 Claims
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1-9. -9. (canceled)
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10. A system comprising:
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an extension node configured to receive and transmit voice signals; and
a gateway connected to the extension node via a serial bus and configured to;
receive a call for the extension node from a device via an outside network, secure a bidirectional isochronous channel in response to receiving the call, and send a channel number corresponding to the secured isochronous channel to the extension node via the serial bus to establish the call between the extension node and the device. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An information terminal comprising:
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a telephone interface configured to transmit and receive a telephone signal through a serial bus;
a television set interface configured to receive a television signal through the serial bus; and
a bus manager configured to control the serial bus, the bus manager including a first asynchronous interface and a first isochronous interface for the telephone signal and a second asynchronous interface and a second isochronous interface for the television signal.
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18. A gateway comprising:
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a telephone gateway configured to;
transfer telephone signals from a telephone network to at least one telephone terminal via a serial bus, and transfer telephone signals from the serial bus to the telephone network;
a television gateway configured to;
receive a television signal from an external television line, and cause the television signal to be transferred via the serial bus; and
a bus manager connected to the telephone gateway, the television gateway, and the serial bus, the bus manager including a first asynchronous interface and a first isochronous interface for transferring the telephone signal and a second asynchronous interface and a second isochronous interface for transferring the television signal.
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19. A call-in signal processing method in a system that includes a gateway and a plurality of extension nodes, the gateway and the plurality of extension nodes being connected via a serial bus, the method comprising:
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selecting, at the gateway, one of an automatic transfer by a number display, a global call-in, or a manual call-in on the basis of setup data;
calling, via the gateway, one or more extension nodes of the plurality of extension nodes;
securing, via the gateway, one or more isochronous channels based on responses from the one or more extension nodes;
allowing the one or more extension nodes to start exchanging data; and
sending, via the gateway, a call status of an extension node of the one or more extension nodes of which call status is changed to the plurality of extension nodes connected to the serial bus. - View Dependent Claims (20)
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21. A call-out signal processing method in a system that includes a gateway and a plurality of extension nodes, the gateway and the plurality of extension nodes being connected via a serial bus, the method comprising:
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receiving, at the gateway, a call from a first extension node of the plurality of extension nodes to a second extension node of the plurality of extension nodes;
confirming, at the gateway, a call status of the second extension node;
securing an isochronous channel for transmission;
sending the call status to at least one other extension node of the plurality of extension nodes connected to the serial bus;
securing an isochronous channel for reception; and
allowing the first extension node and the second extension node to start exchanging data. - View Dependent Claims (22, 23)
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Specification