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• Delay Mechanism: Specifies the delay measurement mechanism:
o End-to-End – slaves determine the delay between them and the master over whole network path (end
to end).
o Peer-to-Peer – each device (master, slaves, switches) only determine the delay to their nearest
neighbor. Peer-to-Peer delay measurement mechanism is best in an engineered network, where all
switches (and routers if there are any) can be guaranteed to be 1588 capable.
• Domain: Specifies PTP clock domain number. Participating devices (master clock, slaves, switches) should be in
the same domain. Domain range is 0 – 127.
• Clock Quality: A set of parameters describing local clock quality. Best Master Clock Algorithm compares clock
quality of all mater capable devices and determines which device in the network is the active master. Clock
quality consist of:
o Class – describes clock class. Allowable value depends of current PTP Mode. Master/Slave: 128-254,
Slave only: 255, Master only: 0-127.
o Accuracy – configures clock accuracy to UTC. Allowable values are: 25ns, 100ns, 250ns, 1us, 2.5us, 10us,
25us, 10us, 250us, 1ms, 2.5ms, 10ms, 25ms, 100ms, 250ms, 1s, 10s, >10s, Unknown
o Priority 1 – configures clock priority 1. Range is 0 – 248 (0 is the highest).
o Priority 2 – configures clock priority 2. Range is 0 – 248 (0 is the highest).
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