Concentrator and reset control method therefor
First Claim
1. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
- determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and
generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied,wherein the reset condition includes an occurrence of a collision between the network devices, and a change of a link on state indicative of a communication availability between the concentrator and the network device into an off state.
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Accused Products
Abstract
There is provided a concentrator and a reset control method therefor that may easily and reliably secure early restoration from an outage of network communications. A concentrator to which a plurality of network devices are connectible includes a communication control part for controlling a transfer process of information among the network devices, a condition determination part for determining whether information obtained from the communication control part satisfies a reset condition, and a reset control part for controlling a reset signal used to reset the communication control part based on a determination by the condition determination part.
9 Citations
18 Claims
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1. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied, wherein the reset condition includes an occurrence of a collision between the network devices, and a change of a link on state indicative of a communication availability between the concentrator and the network device into an off state.
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2. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied, wherein the reset condition includes a start of a communication active state indicating that a packet is being received through one pod connected to the network device, and a lack of update of a number of packets received at the port within a certain period.
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3. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied. wherein the reset condition includes a start of a communication active state indicating that a packet is being transmitted through one port connected to the network device, and a lack of update of a number of packets transmitted at the port within a certain period.
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4. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied, wherein the reset condition includes a start of a communication active state indicating that a packet is being transmitted through one port connected to the network device, an update of a number of packets received at the port within a certain period, and a lack of update of the number of packets transmitted at the port within a certain period.
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5. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied, wherein the reset condition includes a transmission of a pause packet signal longer than a prescribed period from one port connected to the network device, the pause packet signal requesting a stop of sending the packet.
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6. A method for controlling resetting of a concentrator to which a plurality of network device are connectible, said method comprising the steps of:
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determining whether at least one of a communication control part and a timer has generated a signal that satisfies a predetermined reset condition, the communication control part controlling a transfer process of information among the network devices; and generating a signal for resetting the communication control part when said determining step determines the reset condition has been satisfied, wherein the reset condition includes an update of a number of packets within a certain period received at one port connected to the network device, and a lack of release or allocation of a buffer for temporarily storing the packet, within a certain period.
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7. A concentrator for use with a local area network, the concentrator including a plurality of ports, and serving to monitor a communication status, the concentrator comprising:
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specific reset activating means for activating a specific reset function different from a reset at the time of power-on, and for determining whether the specific reset function activates when a specific trigger condition is met; means for designating and varying one or more various specific trigger conditions; and a non-volatile memory for storing a designated status of a controller when the specific reset function activates, wherein the non-volatile memory maintains memory contents during an action of the specific reset function and the reset at the time of power-on, providing the concentrator with an automatic restoration function at the time of obstructions. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification