Transfer direction turnaround in network data communications
First Claim
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1. A system for communicating data, comprising:
- a first device for transmitting and receiving data;
a second device for transmitting and receiving data; and
a communications network coupled to said first and second devices for transmitting data therebetween;
wherein said first device creates a communications link over said communications network and transmits data to said second device and wherein, after such transmission, said second device transmits, using the same communications link, a data direction turnaround message for signalling to said first device that said second device is preparing to send data to said first device, followed by transmitting data from said second device to said first device.
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Abstract
In a network communications system, data is transferred from a first node to a second node. When requested, the second node can transmit a data direction turnaround message to the first node, followed by transferring data to the first node. Data transfer in both directions is made during a single communications link within the network. The turnaround message can function as an acknowledgement of successful transfer to the data transferred from the first node to the second node.
22 Citations
12 Claims
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1. A system for communicating data, comprising:
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a first device for transmitting and receiving data; a second device for transmitting and receiving data; and a communications network coupled to said first and second devices for transmitting data therebetween; wherein said first device creates a communications link over said communications network and transmits data to said second device and wherein, after such transmission, said second device transmits, using the same communications link, a data direction turnaround message for signalling to said first device that said second device is preparing to send data to said first device, followed by transmitting data from said second device to said first device. - View Dependent Claims (2, 3)
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4. A system for communicating data, comprising:
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a first device for transmitting and receiving data; a second device for transmitting and receiving data; and a communications network coupled to said first and second devices for transmitting data therebetween in frames; wherein said first device creates a communications link over said network, wherein said second device transmits to said first device information describing an operating environment of said second device, followed by transmission of data from said first device to said second device, wherein, after such data transmission, said second device transmits, using the same communications link, a data direction turnaround message to said first device, followed by said first device transmitting to said second device information describing an operating environment of said first device, followed in turn by said second device transmitting data to said first device, and wherein said first device and said second device, after they receive each frame, transmit to the other device an acknowledge message to indicate receipt of a data frame. - View Dependent Claims (5)
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6. A method for communicating data between a first device and a second device over a communications network, comprising the steps of:
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(a) transmitting data from the first device to the second device, using a communications link, on the communications network; (b) transmitting a data direction turnaround message from the second device to the first device using the communications link, said turnaround message indicating that the second device is preparing to send data to the first device; and (c) transmitting data from the second device to the first device using the communications link. - View Dependent Claims (7, 8, 9, 10)
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11. A method for communicating data between a first device and a second device over a communications network, comprising the steps of:
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(a) transmitting from the second device to the first device, using a communications link on the network, information describing an operating environment of the second device; (b) transmitting data from the first device to the second device, using the communications link; (c) transmitting a data direction turnaround message from the second device to the first device using the communications link; (d) transmitting from the first device to the second device information describing an operating environment of the first device; and (e) transmitting data from the second device to the first device using the communications link. - View Dependent Claims (12)
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Specification