2.
Network Protocol
By default, the 'NETWORK PROTOCOL' is set to Layer 2 (Ethernet), which will send packets via the Ethernet
data layer
3.
Select Operating Mode
Select the operating mode for the PTP network from the 'OPERATING MODE' dropdown.
Operating mode is a network wide parameter. The configurable options are 'One Step' or 'Two Step'.
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.
Priority #1 and Priority #2
By default, both Priority #1 and Priority #2 are set to 128 and cannot be changed.
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.
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 determined by 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.
Provisioning
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 114
