A domain consists of one or more PTP devices communicating with each other. By default, PTP aware
devices are configured with domain '0'. Changing the domain will cause only devices with the specified domain
to communicate using the PTP protocol. The input range is 0 to 127.
6.
Configure Delay Asymmetry
Modify the 'PRIMARY ETH PORT DELAY ASYMMETRY ' setting if the delay asymmetry in the network link is
known, otherwise it is recommended that the setting is left as its default value of '0'.
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 a calculation consisting of 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 asymmetry delay 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.
Configure Peer Delay Request Interval
The Peer Delay Request interval specifies the time interval between successive Peer Delay Request
messages being sent to other PTP devices on the network. This option only appears when a profile that
uses the Peer-to-Peer delay mechanism is selected.
By default this is set to 0 in 2
^n
seconds, or 1 second. The supported range is 0-5 in 2
^n
seconds, or 1-32
seconds.
8.
Configure Announce Interval
The ANNOUNCE INTERVAL specifies the time interval between successive Announce messages being sent
to other PTP devices on the network.
By default this is set to 1 in 2
^n
seconds, or 2 seconds. The supported range is 0-4 in 2
^n
seconds, or 1-16
seconds.
9.
Announce Receipt Timeout
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.
10.
Configure Sync Interval
Provisioning
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2022 Microchip Technology Inc.
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Manual
DS00004572A-page 102