Back to results
US 2019/0379475 A1Published application
Synchronizing Update of Time of Day Counters Using Time Stamp Exchange Over A Control Plane
AssigneeSkyworks Solutions, Inc.
InventorSrisai Rao Seethamraju
Life of this patent
Estimating the term…
Abstract
A control plane, available to all of the line cards in a system, is used to exchange time stamps to align the Time of Day counters in the master line cards. The master line cards are locked to a system clock distributed over the backplane by a timing card. The timing card is locked to timing of a slave line card that is synchronized with the grand master. Each master line card synchronizes updating its Time of Day counter based on a time stamp exchange and a local clock locked to the system clock and without the use of a 1 pulse per second signal.
Claims20
A method comprising:
- distributing a clock signal from a timing card to a first line card and to a second line card over a backplane;
- performing a time stamp exchange between the first line card and the second line card using a control plane coupled to the first and second line cards;
- and
- synchronizing a second time of day counter on the second line card to a first time of day counter on the first line card based on the time stamp exchange and the clock signal.
1 more element
An apparatus comprising:
- a first line card having a first time of data counter;
- a second line card having a second time of day counter;
- a timing card configured to provide a clock signal to the first and second line cards;
- a control plane communicatively coupling the first and second line cards;
- wherein the first and second line cards are configured to perform a time stamp exchange;
- and
- wherein the second line card is configured to synchronize the second time of day counter to the first time of day counter based on the time stamp exchange.
4 more elements
A method comprising:
- a slave line card synchronizing timing with a grand master;
- a timing card synchronizing a system clock signal with timing of the slave line card;
- the timing card distributing the system clock signal to a plurality of line cards including master line cards and the slave line card;
- the slave line card and one of the master line cards performing a time stamp exchange;
- and
- the one of the master line cards synchronizing update of a second time of day counter in the one of the master line cards to a first time of day counter in the slave line card based on the time stamp exchange.
3 more elements
Dependencies are inferred from the claim text.