Systems and methods for synchronizing network nodes
AssigneeCisco Technology, Inc.
InventorsMike A. Sluyski, Glen W. Miller, Jim Duda, Markus Weber
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Abstract
In one embodiment, the disclosure includes a network node synchronization system. The system may include a first node. The first node may include a first host card comprising a first (TOD) time of day counter, a first digital signal processor (DSP) comprising a first DSP counter; and a first optical communication device comprising a first DSP communication channel, wherein the first DSP communication channel transports DSP frames. In various embodiments, the DSP is a coherent DSP.
Claims19
A network node synchronization system comprising:
- a first node comprising
- a first host card comprising a first host time of day (TOD) counter and a first embedded Pulse Per Second (ePPS) counter,
- a first digital signal processor (DSP) comprising a first DSP counter, wherein the first DSP is a coherent DSP;
- and
- a first optical communication device comprising a first DSP communication channel, wherein the first DSP communication channel transports DSP frames, wherein the first ePPS counter is in communication with both the first host TOD counter and the first DSP counter, wherein a phase of the first ePPS counter is locked with a phase of the first DSP counter using a phase locked loop (PLL).
A method to synchronize a first network node and a second network node, the method comprising:
- providing the first network node comprising a first host TOD counter in communication with a first coherent DSP in the first network node running a first DSP TOD counter;
- providing the second network node comprising a second host TOD counter in communication with a second coherent DSP in the second node running a second network DSP TOD counter;
- synchronizing the first DSP TOD counter with the first host TOD counter;
- and transmitting a first DSP message from the first coherent DSP to the second coherent DSP via a communication channel, wherein the first DSP message comprises a non-zero status value, wherein synchronizing the first DSP TOD counter with the first host TOD counter further comprises:
- providing a first embedded Pulse Per Second (ePPS) counter in the first network node in communication with both the first host TOD counter and the first DSP TOD counter;
- and
- locking a phase of the first ePPS counter with a phase of the first DSP TOD counter using a phase lock loop (PLL).
A method to synchronize
- a first network node and a second network node, the method comprising:
- providing the first network node comprising a first host TOD counter in communication with a first coherent DSP in the first network node running a first DSP TOD counter;
- providing the second network node comprising a second host TOD counter in communication with a second coherent DSP in the second network node running a second DSP TOD counter;
- synchronizing the first DSP TOD counter with the first host TOD counter;
- transmitting a first DSP message from the first coherent DSP to the second coherent DSP via a communication channel, wherein the first DSP message comprises a non-zero status value;
- providing a second embedded Pulse Per Second (ePPS) counter in the second network node in communication with both the second host TOD counter and the second DSP TOD counter;
- locking a phase of the second ePPS counter with a phase of the second DSP TOD counter;
- and
- locking the phase of the second host TOD counter with the phase of the second ePPS counter.
Dependencies are inferred from the claim text.