82 Rockwell Automation Publication 1783-UM003G-EN-P - December 2012
Chapter 3 Manage the Switch via the Device Manager Web Interface
5. Click Submit.
PTP Timing Message Settings
Setting Description
Interface The number of the switch port, including port type (such as Fa for Fast Ethernet and Gi for Gigabit
Ethernet), the base switch number (1), and the specific port number. For example: Fa1/1 is Fast
Ethernet port 1 on the base switch.
Announce Interval The time interval for sending announce messages:
•0 means 1 second
•1 means 2 seconds
•2 means 4 seconds
•3 means 8 seconds
•4 means 16 seconds
The default is 1 (2 seconds).
Announce Receipt Timeout Interval The number of announce intervals that must pass without receipt of an announce message from the
Grandmaster clock before the switch selects a new Grandmaster clock. The number can be from
2…10. The default is 3.
Delay Request Interval The time interval recommended to connected devices to send delay request messages when the
switch port is in the master state:
•-1 means half second
•0 means 1 second
•1 means 2 seconds
•2 means 4 seconds
•3 means 8 seconds
•4 means 16 seconds
•5 means 32 seconds
•6 means 64 seconds
The default is 5 (32 seconds).
Sync Interval The time interval for sending synchronization messages:
•-1 means half second
•0 means 1 second
•1 means 2 seconds
The default is 0 (1 second).
Sync Limit The maximum clock offset before PTP attempts to reacquire synchronization. The value can be from
50…500,000,000 nanoseconds. The default is 50,000 nanoseconds.
We recommend against setting the sync limit below the default (50,000 nanoseconds).
Use values below 50,000 nanoseconds only in networks with a very high-precision Grandmaster
clock. These networks would have a critical need to keep very sensitive devices synchronized.
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