Note:
Select Two Step operation if the Operating Mode is unknown.
4.
Delay Mechanism
By default the 'DELAY MECHANISM' will be set to P2P, which will set the delay mechanism to peer to peer as
defined in IEEE 1588v2-2008.
5.
Configure Priority 1 and Priority 2 Fields
Modify the 'PRIORITY #1' and 'PRIORITY #2' fields if required, otherwise it is recommended that these are left
as their default values.
These parameters modify the automatic selection of server clocks in PTP networks. Lower values mean that
the unit will be preferred against other server capable clocks during the selection process. The priority 1 value
overrides all other selection criteria including clock accuracy, so should be modified carefully. The priority 2
value is treated as the least important criteria, providing greater selection control between otherwise-equal
clocks.
For both priority fields, the input range is 0 to 255, where 0 is the highest priority. The default setting is 128.
6.
Configure Default Domain
Modify the 'DEFAULT DOMAIN
'
number if required, otherwise it is recommended that it is left as its default
value of '0'.
A domain consists of one or more PTP devices communicating with each other. By default, PTP aware
devices are configured with a domain of '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 and 254.
7.
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 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).
Provisioning
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 130
