Network Tab - Spectracom VersaSync User Manual

2.7 Configuring Network Settings
Sync Rate : The rate at which Sync messages are sent, in packets per second. [1 =
1 packet/sec.; 2 = 2 packets/sec.; 0.5 = 1 packet/2 sec.]
Announce Rate : [see Sync Rate above] The rate at which Announce messages are sent, in
packets per second.
Delay Req Rate : Interval between request messages sent by the slave to the master.
Best Master Clock Algorithm : [On or OFF] When set to ON, the Master will listen for
traffic from other Masters and become passive if another master on the network has bet-
ter 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 network.
When set to OFF, the Master will act as an active master no matter whether or not other
masters are present. This may be required for certain PTP profiles.
Clock Priority 1 : [0 to 255] (0 is highest priority. Default is 128 for both priority values.
This is usually the priority value that a Slave is set to.) See IEEE 1588-2008, Section
8.10.1, 8.10.2.
Clock Priority 2 : [0 to 255] (same as above).
Current UTC Offset : to convert to civil time.
Network Transport : [Ethernet, IPv4/UDP] Selects the transport protocol used for PTP pack-
ets.
Management Mechanism tab
Request Peer Information : [ON/OFF] Enable/disable management requests.
Request Peer Information Rate : [0.2 = one request every five seconds] Request rate in
seconds for PTP Management messages.
Respond to Peer Information Requests : [ON/OFF] Enable/disable management responses.

Network tab

Multicast Ttl : [1 through 255] Time-to-live (packet lifespan) — Sets the TTL field for PTP
packets except for Peer-to-Peer packets for which TTL is forced to 1 as specified in IEEE
Std 1588-2008 Annex D.3.
108
• 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.
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