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1588 Synchronization Drifts Away with Time when using a 10 Mbps Router with the PXI-6682

Primary Software: Driver Software>>NI-Sync
Primary Software Version: 3.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: PXI/CompactPCI>>Platform Modules>>PXI-6682

Problem:
I'm doing 1588 synchronization with the PXI-6682, but I've noticed that synchronization gets worse with time (the slave continues to drift away from the master). Looking at the "offset from master" property for the slave, the value will look normal (under 100ns) most of the time, but there will be sudden jumps to a very large number of seconds for one iteration and then go back to normal for a few seconds, only to repeat the process.

Solution:
This problem happens when using a 10 Mbps router, but can be resolved by setting the external PHY of the PXI-6682 network adapter to 10 Mbps Full Duplex. The following steps walk you through how to change these settings.

  1. Determine the name of network adapter device for the PXI-6682, open Measurement and Automation Explorer and open the Test Panel for the PXI-6682. The network adapter is listed under the 1588 tab.



  2. Open Network Connections from Control Panel and select the correct Network Adapter using the name you found in step one.

  3. Right-click the Network Adapter and select Properties

  4. From the Properties window click on Configure



  5. From the Configuration window, select the Advanced tab and make sure the External PHY property is selected. Change the value to 10Mbps Full Duplex.

Your system should now work properly when using a 10Mbps router.

Related Links:
Developer Zone Tutorial: Introduction to Distributed Clock Synchronization and the IEEE 1588 Precision Time Protocol

Attachments:
6682TestPanel.JPG
Properties.JPG
Config.JPG
NetConnection.JPG

Report Date: 10/10/2007
Last Updated: 06/01/2009
Document ID: 4E9BS88P

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