Min Announce Interval: The minimum value of the Announce interval granted by
the Master Clock. In packets per second. [128 Per Second
Max Announce Duration: The maximum value of the Announce interval granted by
the Master Clock. In seconds. [10000]
Min Delay_Req Interval: In packets per second. [128 Per Second]
Max Delay_Req Duration: In seconds. [10000]
Max Slaves: The maximum number of slaves the card will serve. [4000]
Advanced tab settings
A b o u t … P T P T r a n s m i s s i o n M o d e s
The PTP Card is able to transmit the PTP packets in three transmission modes:
• Multicast Mode: PTP packets are transmitted to all PTP Clocks by means of 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 Number, the Port Identity (Clock Identity +
Port Number) of the transmitter, the packet identifier (Sequenced). 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 mes-
sages until a Slave has been granted to run in Unicast mode.
• Unicast Mode: This mode is enabled by default. This is a Point-to-Point transmission mode
between two PTP Clocks by means of the unique IP address assigned to each PTP Clock.
---------------------------------------------
N O T E: The Unicast mode is only implemented for the following PTP packets:
Announce, Sync and Follow-Up, Delay_Req and Delay_Resp.
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.
_______________
• Minicast/Hybrid Mode: The Minicast/Hybrid mode is a method to minimize the PTP
packets payload on the network, where: The transmissions initiated by the Master (Announce,
Sync/Follow-Up) run in Multicast mode.
The transmissions initiated by the Slaves (Delay_Req/Delay_Resp) run in Unicast mode.
466 SecureSync 2400 User Manual
APPENDIX
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