Safran SecureSync 2400 User Manual page 168

2.16 Configuring PTP
152
Delay Mechanism: [Request-Response or Peer] Set for propagation delay
measurements.
Domain: [0 through 127] Sets the current PTP Domain Number, as defined
in IEEE Std 1588-2008 Section 7.1
Communication Mode: Select multicast, hybrid, or unicast mode.
A b o u t ... P T P
The PTP Card is able to transmit the PTP packets in three transmission modes:
• Multicast Mode
Multicast IP addresses dedicated to the PTP protocol (224.0.1.129, 224.0.0.107).
PTP packets received by the PTP Clocks are then filtered from the Domain Num-
ber, 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.
T r a n s m i s s i o n
: PTP packets are transmitted to all PTP Clocks by means of
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2 SecureSync 2400 User Manual Rev. 5.2