Systems and methods for the synchronization of a real-time scheduled packet network using relative timing
First Claim
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1. A method of synchronizing at least one node in a real-time scheduled packet network, comprising:
- transmitting first heartbeat packets at a predetermined frequency to the at least one node;
receiving the first heartbeat packets at the at least one node;
synchronizing an internal frequency reference in each of the at least one node according to at least two of the received first heartbeat packets; and
calculating a link phase of a link over which the heartbeat packets are received by the at least one node by subtracting a time at which the node transmitted a second heartbeat packet from a time at which the node received a first heartbeat packet.
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Abstract
A node of a real-time scheduled packet network synchronizes an internal frequency reference to a master node by receiving first heartbeat packets that are transmitted by the master node at a predetermined frequency. The node calculates a link phase of a link over which the first heartbeat packets are received by subtracting a time at which the node transmitted a second heartbeat packet to another node from a time at which the node received a first heartbeat packet.
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2 Claims
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1. A method of synchronizing at least one node in a real-time scheduled packet network, comprising:
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transmitting first heartbeat packets at a predetermined frequency to the at least one node;
receiving the first heartbeat packets at the at least one node;
synchronizing an internal frequency reference in each of the at least one node according to at least two of the received first heartbeat packets; and
calculating a link phase of a link over which the heartbeat packets are received by the at least one node by subtracting a time at which the node transmitted a second heartbeat packet from a time at which the node received a first heartbeat packet.
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2. A system for synchronizing a real-time scheduled packet network, comprising:
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a master node;
at least one synchronized node; and
a respective link between the master node and each of the at least one synchronized node;
wherein;
the master node is configured to transmit first heartbeat packets via the respective link to the at least one synchronized node at a predetermined frequency; and
the at least one synchronized node is configured to;
receive the first heartbeat packets;
synchronize an internal frequency reference according to at least two of the received first heartbeat packets; and
calculate a link phase of the respective link by subtracting a time at which the synchronized node transmitted a second heartbeat packets to another node from a time at which the synchronized node received a first heartbeat packets from the master node.
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Specification