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Introduction
1.6.1 Supported Time Synchronization Sources
1.6.1
Supported Time Synchronization Sources
The following time synchronization sources are supported by the RUGGEDCOM
RS416PF, with or without the PTP card:
NTP
NTP (Network Time Protocol) is the standard for synchronizing the clocks of
computer systems throughout the Internet and is suitable for systems that require
accuracies in the order of 1 ms.
IRIG-B PWM
IRIG-B time synchronization is an even older, established, inter-device time
synchronization mechanism providing accuracy in sub-milliseconds.
IEEE 1588
IEEE 1588 is designed to provide networked, packet-based time synchronization
between different networking nodes (PTP devices). The RUGGEDCOM RS416PF
supports PTP v2, which is defined in the IEEE 1588-2008 standard. IEEE 1588
is designed to fill a niche not well served by either of the two older, dominant
protocols, NTP and IRIG-B. IEEE 1588 is also designed for applications that cannot
bear the cost of a GPS receiver at each node or for which GPS signals are inaccessible.
The RUGGEDCOM RS416PF only supports ordinary clock mode. An ordinary clock can
be configured as either a Grandmaster Clock (GM) or a Slave Clock (SC) within the
master-slave hierarchy.
Every Ethernet port on the RUGGEDCOM RS416PF supports IEEE 1588. For more
information, refer to
1.6.2
TTL Outputs
The PTP card provides a TTL (Transistor-Transistor Logic) output.
The TTL OUT port supports the IRIG-B PWM and PPS signal formats. Enabling/
disabling the output port and selecting the signal format is controlled through the
RUGGEDCOM RS416PF operating system.
The number of devices that can be connected to the TTL Out port is dependent on
the cabling type and length, as well as the input impedances of the devices. The
following simplified circuit schematic shows the interface between an IRIG-B source
and connected devices.
6
Synchronization Source
NTP
IEEE 1588 v2
IRIG-B PWM
"IEEE 1588 Support (Page
Without PTP Card
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Installation Manual, 04/2021, C79000-G8976-1355-04
With PTP Card
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RUGGEDCOM RS416PF
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