Circuitry and method for detection of network node aging in communication networks
First Claim
1. A data communication network comprising a network node that includes:
- a crystal oscillator that provides a local time reference derived from a clock signal produced by the crystal oscillator;
a reset circuit that resets the network node in response to a first bus reset pulse received through the network;
a controller that issues a second bus reset pulse of a predetermined length substantially greater than a clock period of the clock signal of the crystal oscillator; and
a bus reset detector that determines a length of the first bus reset pulse based on the local time reference and that adjusts the local time reference based on the determined length of the first bus reset pulse.
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Accused Products
Abstract
The network node includes a local crystal oscillator for providing a time reference derived from the clock signal produced by the local crystal oscillator, a reset stage for resetting the network node in response to a bus reset pulse received through the network and a control means for issuing a bus reset pulse of a predetermined length substantially greater than a clock period of the clock signal of the local crystal oscillator. Further the network node includes a bus reset detector for determining a length of the received bus reset pulse based on the local time reference. The bus reset detector in the network node is also adapted to adjust the local time reference based on the determined length of the received bus reset pulse.
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Citations
10 Claims
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1. A data communication network comprising a network node that includes:
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a crystal oscillator that provides a local time reference derived from a clock signal produced by the crystal oscillator; a reset circuit that resets the network node in response to a first bus reset pulse received through the network; a controller that issues a second bus reset pulse of a predetermined length substantially greater than a clock period of the clock signal of the crystal oscillator; and a bus reset detector that determines a length of the first bus reset pulse based on the local time reference and that adjusts the local time reference based on the determined length of the first bus reset pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification