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Synchronous Ethernet clocks, based on ITU-T G.813 clocks, are defined in terms of accuracy, noise transfer, holdover performance, noise tolerance and noise generation. These clocks are referred as Ethernet Equipment Slave clocks. While the IEEE 802.3 standard specifies Ethernet clocks to be within ±100 ppm. EECs accuracy must be within ±4.6 ppm.
An ordinary clock is a device with a single network connection that is either the source of or the destination for a synchronization reference. A source is called a leader, a.k.a. master, and a destination is called a follower, a.k.a. slave. A boundary clock has multiple network connections and synchronizes one network segment to another. A ...
Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift , caused by clocks counting time at slightly different rates.
The Time-Triggered Ethernet (SAE AS6802) (also known as TTEthernet or TTE) standard defines a fault-tolerant synchronization strategy for building and maintaining synchronized time in Ethernet networks, and outlines mechanisms required for synchronous time-triggered packet switching for critical integrated applications and integrated modular avionics (IMA) architectures.
IEEE 1588 Clock and 10/100/1000 Mbit/s Packet Timestamper from Microsemi Corporation [104] IEEE 1588 PTP Synchronization of Network Communications Equipment from Integrated Device Technology [105] BroadPTP in network equipment using Broadcom silicon. [106]
In contrast to standard Ethernet according to IEEE 802.3 and Ethernet bridging according to IEEE 802.1Q, time is very important in TSN networks.For real-time communication with hard, non-negotiable time boundaries for end-to-end transmission latencies, all devices in this network need to have a common time reference and therefore, need to synchronize their clocks among each other.