Pico Second Timing for High Energy Facilities
In this note, we present the timing system architecture currently under development by Safran for the distribution of synchronized triggers.
Software-defined Timing: Embedded Timing for Next-generation Communication Systems
Explore HATI (High Accuracy Timing IP) core, utilizing Field-Programming Gate Array: an integrated circuit designed to be configured by a customer or a designer after manufacturing – hence the term field-programmable. See also resources alone, implementing IEEE-1588-2019 protocol for sub-nanosecond timing over Ethernet.
White Rabbit PTP License Activation
Can a WR device keep working with a single operating power supply module?
The short answer to this question is yes, a WR device can keep working with only one power supply.
The reason why these devices typically have two power supplies is due to redundancy purposes. Hence, the device is designed to keep working with only one of them in case the other fails.
When a PSU (Power Supply Unit) fails, a blinking red light can be seen. When this situation happens, it is necessary to remove carefully the affected power supply until the red light stops blinking. Then, press the start button on the device. This action should not be affected by any booting issue related to hardware changes due to the PSU.
It is highly relevant to restore the damaged power supply as soon as possible, because with a single PSU, the device depends completely on it and, in case it fails, the service will be stopped.
Why is a PTP license needed in a WRZ device and how can I upload it?
How is the leap second file updated in WR devices?
Leap seconds are reviewed every 6 months. Download the latest leap second file from https://www.ietf.org/timezones/data/leap-seconds.list and save it as “leap-second.list”.
Through the web page:
1. Go to “Timing/Misc/Configuration”. Then drag and drop the file into the box, or press “Browse” and select the file.
2. Press “Save”.
3. Reboot the device.
1. Remove the file /media/data/usr/local/etc/leap-seconds.list if it exists:
2. If the device has internet access, run the following command:
wget -O /media/data/usr/local/etc/custom-leap-seconds.list https://www.ietf.org/timezones/data/leap-seconds.list
3. Otherwise, transfer the file from the local computer to the device through SCP in the same folder.
How can I retrieve the logdump file from a WR-Z device?
The log files can be retrieved through different procedures.
Firstly, you need to introduce the following command on your PC:
ssh user@IP “source /etc/profile; wrz_logdump -o /tmp/”
Wait 30 seconds.
Finally, introduce the next command:
Note that user and IP are the typical WR-Z device credentials.
Otherwise, if what you want is the logdump file generated after reboot, the steps are almost the same. However, the file is stored within the following directory:
In case you want to check if this file is the one generated in your last reboot, you should introduce the next commands:
Using the web page:
Management -> Maintenance -> Dump Log
Can I use NTP as an active reference to discipline the internal oscillator of a WR device?
No. Due to its poor performance, NTP, or Network Time Protocol, is a widely used networking protocol that enables computers and devices to synchronize their system clocks with a reference time source. It ensures accurate timekeeping in computer networks by allowing devices to obtain precise time information from NTP servers, which are typically synchronized to highly accurate atomic clocks. NTP is essential for various applications and services that rely on synchronized time, such as network security, authentication, and data logging. is always in survey mode, and, thus, it cannot actively discipline the local clock.