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RollCall Control Panel
Time Sync Configuration
Time Sync Configuration
The Time Sync Configuration page allows selection of the source to be used for synchronizing
flows, and configuration of any properties associated with the relevant source.
Time Sync Configuration page
The following facilities are available from this page:
Option Description
Time Sync Mode Click a radio button to select the required mode. PTP options
require a grandmaster clock to be present in the system.
Note: Mixing modes within a system is not advisable. For
example, PTP uses atomic time (TAI), whereas NTP is UTC,
which is leap-second corrected. So, the two systems will not
give identical results.
Options are:
• PTP Multicast - this uses multicast for both sync and
follow-up messages.
• PTP Unicast - this uses multicast for the sync messages
and unicast for the follow-up messages.
• NTP - uses NTP for local clock correction. NTP can usually
maintain time to an accuracy of around 1-10ms, but this
value could rise to something on the order of >100ms,
depending on network congestion, asymmetry, etc. This
potentially means that 1-5 frames of misalignment of the
local device clocks may be seen across the network.
• Freerun - the local device clock is left to free run, that is it
is not corrected with respect to the world clock. This will
drift over time.
Select as required.
NTP Configuration To add an NTP server, enter the server’s IP address in to the
New field.
PTP Network Interface Click check boxes to select the network interfaces to be used.
If an interface fails, the next interface on the list will be
switched to automatically. Select the interface to be used as a
default from the Preference list; this will be used unless it has
been disabled or has failed.
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