Allen-Bradley armorstratix 5700, Руководство пользователя, Страница: 88 / 458

88 Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
Chapter 3 Configure Switch Features
Clock Quality Displays a summary of the quality of the Grandmaster clock:
• Class—Time and frequency traceability of the Grandmaster clock.
• Accuracy—Expected accuracy of the Grandmaster clock when the Best Master Clock algorithm is in use.
• Offset (log variance)— Offset between the local clock and an ideal reference clock.
Steps Removed Displays the number of hops from the local clock to the Grandmaster clock.
Local clock time Displays the time stamp of the local clock.
PTP Time Property
Current UTC offset valid Indicates whether the current Coordinated Universal Time (UTC) offset is valid.
Current UTC offset Displays the offset between the International Atomic Time (TAI) and UTC in seconds.
Time Source Displays the time source used by the Grandmaster clock.
Time Property Persistence Displays the number of seconds that time properties are preserved after a primary Grandmaster clock fails and a secondary Grandmaster clock
takes over.
Device Clock Details
Device Time Source Displays the time source used by the switch.
Device Clock Time Displays the time on the switch, obtained from the time source.
Per Port Settings
Port Name Displays the port type and port number:
• Fa—Fast Ethernet
• Gi—Gigabit Ethernet
• Te—10 Gigabit Ethernet
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.
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.
When at least one switch port is PTP-enabled, the End to End Transparent mode is selected by default.
Delay Request Interval The logarithmic mean interval in seconds
Type the recommended to connected devices to send delay request messages when the switch port is in the master state.
Valid values:
• -1—half second
• 0—1 second
• 1—2 seconds
• 2—4 seconds
• 3—8 seconds
• 4—16 seconds
• 5—32 seconds
• 6—64 seconds
Default: 5 (32 seconds)
Announce Timeout Type the number of announce intervals, specified as the logarithmic mean in seconds, that must pass without receipt of an announce message
from the parent or Grandmaster clock before the switch selects a new parent or Grandmaster clock.
Valid values: 2…10
Default: 3 (8 seconds)
Table 28 - Boundary Mode Fields (Continued)
Field Description