Time Synchronization; Irig-B Ports - Siemens RUGGEDCOM RS416 Installation Manual

RUGGEDCOM RS416
Installation Guide
Section 3.5

Time Synchronization

The RS416 is able to derive and provide time synchronization via Ethernet using the Precision Time Protocol
(PTP) and NTP (Network Time Protocol). With the IRIG-B module is installed, the RS416 is also able to
synchronize to received IRIG-B time signal and to distribute it via BNC and via serial ports equipped with IRIG-B
signals. Please refer to the data sheet for ordering options.
The following are the time synchronization sources supported by the RS416 for time synchronization.
Synchronization Source
NTP
IEEE 1588 v2
IRIG-B PWM
The following are the time synchronization services supported by the RS416.
Synchronization Service
NTP
IEEE 1588 v2
IRIG-B PWM
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 on the order of 1 ms.
IRIG-B (Inter Range Instrumentation Group, mod B) time synchronization is an established, inter-device time
synchronization mechanism which provides accuracy on the order of 1ms to 1μs.
IEEE 1588 is designed to fill a niche not well served by either NTP or IRIG-B. IEEE1588 is designed for local
systems requiring accuracies on the order of 100 nanoseconds. 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. Every Ethernet
port on the RS416 supports IEEE1588.
Section 3.5.1

IRIG-B Ports

The IRIG-B output ports described in sections 3.3 and 3.5 derive their time from the IRIG-B module, which
occupies one slot in lieu of a two-port Ethernet module. The IRIGB module has one dedicated input and one
dedicated output. These ports operate in IRIG-B PWM mode (IRIG-B006 or IRIG-B007) only.
The following figure shows the layout of the BNC connectors on the IRIG-B I/O board. The LED in the center
of the board, indicated by the mark, reflects the status of the received IRIG-B signal, and is described in the
following table.
Time Synchronization
Without IRIG Module
Yes
Yes
No
Without IRIG Module
Yes
Yes
No
Communication Ports
With IRIG Module
Yes
Yes
Yes
With IRIG Module
Yes
Yes
Yes
Chapter 3
23