Allen-Bradley armorstratix 5700, Руководство пользователя, Страница: 95 / 458

Rockwell Automation Publication 1783-UM007I-EN-P - December 2017 95
Configure Switch Features Chapter 3
Figure 5 - Boundary Mode
Table 32 - Boundary Mode
Field Description
Clock Identity Displays a unique identifier for the clock.
Grandmaster Selection Priority1 Type a value to override the default criteria (clock quality, clock class, and so on) for the best master clock selection. A lower value takes
precedence.
Valid values: 0…255
Default: 128
Grandmaster Selection Priority 2 Type a value to use as a tie-breaker between two devices that are otherwise equally matched in the default criteria. For example, you can give
a specific switch priority over other identical switches. A lower value takes precedence.
Valid values: 0…255
Default: 128
Offset from Master Displays the time offset in nanoseconds between the slave and master clocks.
Port Displays the port type and port number:
• Fa—Fast Ethernet
• Gi—Gigabit Ethernet
• Te—10 Gigabit Ethernet
Enable Check the checkbox for each port on which to enable PTP. You can enable one or more switch ports.
By default, PTP is enabled on all the Fast Ethernet and Gigabit Ethernet ports.
For Stratix 8000/8300 switches, only the ports on the base switch module are PTP-capable. The switch expansion modules do not support PTP.
State Displays the synchronization state of the switch port with the parent or Grandmaster clock:
• Initializing—The switch port is waiting while a parent or Grandmaster clock is selected.
• 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 help 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—Either PTP is not operating properly on the switch port or nothing is connected to the port.
• Disabled—PTP is not enabled on the switch port.