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Interface:Ethernet:Time Sync:Offset From Master

Last Modified: December 6, 2019

Provides the positive or negative offset in time between this clock and the grandmaster.

Offset From Master can be used to determine when this XNET interface is sufficiently synchronized to the grandmaster in order to continue.

Data type: datatype_icon

Long Name: Interface:Ethernet:Time Sync:Offset from Master

Class: XNET Session

Permissions: Read

The time synchronization protocol specifies that this offset is received by a slave port, and that offset is used to compute the offset that transmits on a master port to the next clock in the network. Technically, the offset is relative to the previous master port (i.e., nearest neighbor); but practically, the offset is relative to the grandmaster. This offset does not account for clock inaccuracies in the communication path from grandmaster to slave (e.g., switches).

When Port State is Master, this XNET interface acts as grandmaster, and therefore this property returns 0.0.

For the Protocol of IEEE Std 802.1AS-2011, this property corresponds to the offsetFromMaster parameter as described in 14.3.2 of IEEE Std 802.1AS-2011.

Where This Property Is Available:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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