Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 113)

Rockwell Automation Publication 1783-UM003I-EN-P - March 2014 113
Manage the Switch via the Device Manager Web Interface Chapter 4
State (Boundary mode only.) The synchronization state on the switch port with the parent or Grandmaster clock:
• Listening—The switch port is waiting while a parent or Grandmaster clock is selected.
• Pre-master—The switch port is transitioning to change to Master state.
• Master—The switch is acting as a parent clock to the devices connected to that switch port.
• Passive—The switch has detected a redundant path to a parent or Grandmaster clock. For example, two different
switch ports claim the same parent or Grandmaster clock. To prevent a loop in the network, one of the ports changes
to Passive state.
• Uncalibrated—The switch port cannot synchronize with the parent or Grandmaster clock.
• Slave—The switch port is connected to and synchronizing with the parent or Grandmaster clock.
• Faulty—PTP is not operating properly on that switch port.
• Disabled—PTP is not enabled on the switch port.
Enable By default, PTP is enabled on all the Fast Ethernet and Gigabit Ethernet ports on the base switch module. Only the ports
on the base switch module are PTP-capable. The switch expansion modules do not support PTP.
When at least one switch port is PTP-enabled, the Forward mode is selected by default.
You can enable or disable PTP on a per-port basis.
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).
Announce Timeout 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.
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).
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 Fault Limit The maximum clock offset before PTP attempts to reacquire synchronization.
The value can be from 50…500,000,000 ns. The default is 50,000 ns.
We recommend against setting the sync limit below the default (50,000 ns).
Use values below 50,000 ns only in networks with a very-high-precision Grandmaster clock. These networks have a
critical need to keep very sensitive devices synchronized.
Table 13 - PTP Fields (continued)
Field Description