Method and system for compensated time stamping for time-sensitive network communications
Aspects of a method and system for compensated time stamping for time-sensitive network communications are provided. In this regard, one or more timestamps generated in an OSI layer above the physical layer may be adjusted based on parameters associated with an amount of time in which data traverses a PHY of the network device. Communications of the network device may be managed based on the adjusted one or more timestamps. The parameters may comprise one or more of: average ingress PHY traversal time, average egress PHY traversal time, variance of ingress PHY traversal time, and variance of egress PHY traversal time. One or more network links coupled to the network device may be characterized based on the one or more adjusted timestamps. The parameters may be stored in one or more registers within a PHY of the network device.
1. A method for networking, the method comprising:
performing by one or more circuits in a network device, one or more functions comprising:
storing, in one or more registers within a physical layer device of said network device, determined parameters associated with a traversal time of data in a single direction between a first end of said physical layer device associated with a first interface of said physical layer device with a higher layer and a second end of said physical layer device associated with a second interface of said physical layer device physical media; and
adjusting one or more timestamps generated in a layer above said physical layer device based on said stored determined parameters that are retrieved from said one or more registers within said physical layer device of said network device, said adjusting accounting for said traversal time of data in said single direction through said physical layer device due to operation of said physical layer device in an energy saving mode.
2. The method according to claim 1 , further comprising determining said parameters using one or more counters in said physical layer device.
3. The method according to claim 1 , further comprising determining said parameters using one or more counters in a testing system that is coupled to said physical layer device.
4. The method according to claim 1 , further comprising determining said parameters using a network device that exchanges test data with said physical layer device and receives count values from one or more counters in said physical layer device.
5. The method according to claim 1 , further comprising determining said parameters based on a size of a block of data that traverses said physical layer device.
6. The method according to claim 1 , further comprising accessing said one or more registers via a management data input/output (MDIO) bus.
7. The method according to claim 1 , wherein said timestamps are used as part of an IEEE 1588 protocol.
8. The method according to claim 1 , wherein said timestamps are used as part of an audio/video bridging protocol.
9. The method according to claim 1 , wherein said parameters include an average ingress physical layer device traversal time or an average egress physical layer device traversal time.
10. The method according to claim 1 , wherein said parameters include variance in ingress physical layer device traversal time or variance in egress physical layer device traversal time.
11. The method according to claim 1 , further comprising transmitting a packet having an adjusted timestamp.
12. A system for networking, the system comprising:
one or more circuits for use in a network device, said one or more circuits operable to:
store, in one or more registers within a physical layer device of said network device, determined parameters associated with a traversal time of data in a single direction between a first end of said physical layer device associated with a first interface of said physical layer device with a higher layer and a second end of said physical layer device associated with a second interface of said physical layer device with physical media; and
adjust one or more timestamps generated in a layer above said physical layer device based on said stored determined parameters that are retrieved from said one or more registers within said physical layer device of said network device, said adjusting accounting for said traversal time of data in said single direction through said physical layer device due to operation of said physical layer device in an energy saving mode.
13. The system according to claim 12 , wherein said one or more circuits are further operable to determine said parameters using one or more counters in said physical layer device.
14. The system according to claim 12 , wherein said one or more circuits are further operable to determine said parameters based on a size of a block of data that traverses said physical layer device.
15. The system according to claim 12 , wherein said one or more circuits are further operable to access said one or more registers via a management data input/output (MDIO) bus.
16. The system according to claim 12 , wherein said timestamps are used as part of an IEEE 1588 protocol.
17. The system according to claim 12 , wherein said timestamps are used as part of an audio/video bridging protocol.
18. The system according to claim 12 , wherein said parameters include an average ingress physical layer device traversal time or an average egress physical layer device traversal time.
19. The system according to claim 12 , wherein said parameters include variance in ingress physical layer device traversal time or variance in egress physical layer device traversal time.
20. The system according to claim 12 , wherein said one or more circuits are further operable to transmit a packet having an adjusted timestamp.