Introduction
1.6.2 TTL Outputs
Every Ethernet port on the RUGGEDCOM RS416 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 RS416 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.
V
S
R
S
R
C
R
L
/N
3
2
1
1
Source
2
Cabling
3
Device
Figure 1.3
IRIG-B Simplified Circuit Schematic
The maximum number of devices (N) that can be connected to the source is
determined by checking if the source current (IS) required to drive the connected
devices is less than the maximum drive current the source can provide, and verifying
that the load voltage (VL) the connected devices see is greater than the minimum
required voltage.
1.6.3
IEEE 1588 Support
RUGGEDCOM RS416 supports various IEEE 1588 time synchronization capabilities
and provides synchronization in 2-step mode. This mode supports the following clock
types:
• End-to-End Slave Clock
• End-to-End Master Clock
RUGGEDCOM RS416
Installation Manual, 04/2021, C79000-G8976-1018-10
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