PTP automatically calculates the propagation delay between a server and client, but this calculation assumes
the delay in each direction of transmission is the same. PTP cannot measure and compensate for delay
asymmetry, which means that the presence of delay asymmetry reduces PTP time accuracy.
Delay asymmetry is calculated from the server to client path delay minus the client to server path delay. A
client uses the delay asymmetry value to compensate for the error caused by delay in asymmetry in the PTP
delay calculation mechanism.
If the delay asymmetry is known, entering it manually will allow it to be compensated for, and improve time
accuracy. The input range is 3.2768e+14 ns×2
^16
to −3.2768e+14 ns×2
^16
(-5 to 5 seconds).
7.
Peer Delay Request Interval
By default, the 'PEER DELAY REQUEST INTERVAL' is set to 1 second
8.
Announce Interval
By default, the 'ANNOUNCE INTERVAL' is set to 1 second.
9.
Announce Receipt Timeout
10. By default the 'ANNOUNCE RECEIPT TIMEOUT' is set to 3. This means that after 3 announce intervals, if
the device has not recieved an announce message it will trigger an announce receipt timeout event, which will
move the port into a listening state.
11.
BMCA
By default, the 'BMCA' operations will be set to 'BASIC' and will operate as defined in IEEE 1588v2-2008
12.
Clock Class Rules
By default, the 'CLOCK CLASS RULES' operations will be set to '61850' and will operate as defined in IEC
61850-9-3.
13.
Save Settings
Click the 'SAVE' button to write the settings to the GridTime 3000.
A 'Saved!' notification will appear in the bottom right corner of the page indicating that the settings have
successfully been written to the GridTime 3000.
9.5.7.6
G.8275.1 Telecom Profile
This section describes how to provision a GridTime 3000 with the G.8275.1 Telecom Profile.
1.
Select G.8275.1 Telecom Profile Profile
Select 'G.8275.1 Telecom Profile' from the 'PTP PROFILE' dropdown.
Provisioning
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 135
