from the Domain Number, the Port Identity (Clock Identity + Port Number) of
the transmitter. When the Master Clock is set in Multicast mode, this module will
deny the requests from the Slaves Clocks to run in Unicast mode. When the
Master Clock is set in Unicast mode, it doesn’t transmit any PTP messages until a
Slave has been granted to run in Unicast mode.
• Unicast Mode: This is a Point-to-Point transmission mode between two PTP
Clocks by means of the unique IP address assigned to each PTP Clock.
• Hybrid Mode: [default] This mode uses Multicast messages for Sync, Follow-
Up, and Announce packets from the Master. Slaves are expected to send Delay
Request messages to the Master in Unicast, and the Master responds in Unicast.
No Unicast Negotiation grants are necessary.
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The Unicast mode is activated at the initiative of the Slaves. Each Slave, which
wants to run in Unicast mode, shall first negotiate Unicast contracts with the
Master.
Mode: Master Only or Slave Only.
Unicast Contact Duration: [10 to 1000 s] Unicast communication mode
only. Duration of the Unicast contract, in seconds.
Sync Rate: The rate at which Sync messages are sent, in packets per
second.
Announce Rate: [see Sync Rate above] The rate at which Announce mes-
sages are sent, in packets per second.
Delay Req Rate: (Request-Response Delay Mechanism Only). Interval
between request messages sent by the slave to the master, in packets per
second.
Peer Delay Req Rate: (Peer Delay Mechanism Only). Interval between
request messages sent between peers, in packets per second.
Best Master Clock Algorithm: [On or OFF] Only available with Multicast
and Hybrid modes. When set to ON, the Master will listen for traffic from
other Masters and become passive if another master on the network has
better credentials according to the Best Master Clock Algorithm (Section
9.3 of IEEE 1588-2008). A passive master will not transmit any protocol
messages as long as another Master is active as the Best Master on the net-
work. If the unit is synchronized but the oscillator is not yet locked to the
primary reference, then the BMCA will transition to slave until the end of
that condition.
When set to OFF, the Master will act as an active master no matter whether
2.8 Configuring Network Settings
CHAPTER 2 • VersaSync User Manual Rev. 12
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