With hardware time stamps, individual frames can be time-stamped with high precision. However, to assure that the time stamps in frames from different accelerators in the same, or even different, appliances are comparable, the clocks driving the time stamp engines must be synchronized. Napatech has advanced HW time synchronization between accelerators.
There are various mechanisms to provide time synchronization, including synchronization with the operating system clock, known as OS time synchronization. However, for the best accuracy, a hardware-based time synchronization solution based on an industry standard time synchronization protocol should be used. For many applications that rely on accurate time stamps to understand when an event occurred or accurately measure delay across high-speed networks, nanosecond accuracy is essential.
Napatech accelerators provide flexible support for a range of standard time synchronization mechanisms. Dedicated time synchronization connectors enable direct time signal input from an external time source and retransmission of time synchronization signals to other accelerators. In this way, multiple accelerators in the same host or in different hosts will operate in lockstep in a large synchronous installation.
Napatech accelerators are designed to accommodate the time synchronization mechanisms available during deployment. With dedicated ports that can accommodate multiple time synchronization protocols, Napatech provides a flexible solution that does not need to sacrifice ports which are normally used for capture and transmission.
The following list contains some of the time synchronization mechanisms supported:
• IEEE 1588-2008 /PTPv2 Time Synchronization
• PPS Time Synchronization
• GPS and CDMA Time Synchronization over PPS and Server Serial Port
• OS Time Synchronization