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IEEE 1588 OVERVIEW |
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IEEE 1588 Unplugged – An introduction to IEEE 1588 |
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SYNOPSIS |
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Synchronization becomes a necessity when devices working at a distance from each other must also work in conjunction. In such scenarios, a local clock, or Master Clock, synchronizes with the device clocks networked within the same system. Due to this need for synchronization, IEEE 1588 was released as a standard of protocol in 2002.
However, if two clocks are set at the same rate, there is no guarantee that they will stay in synchronization. This is why the process of synchronization is continuous. Several factors can cause two identical clocks to lose synchronization. Causes such as differences in temperature, the age of the clocks themselves, and the rate of frequency can all affect the quality of synchronization. It is because of these factors that a need for clock synchronization arose. |
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SYNCHRONIZATION |
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IEEE 1588 provides fault tolerant synchronization for different clocks along the same network. There is very little bandwidth consumption, processing power, and setup. IEEE 1588 accomplishes all of this by using the precision time protocol, or PTP. The time protocol synchronizes all clocks within a network by adjusting clocks to the highest quality clock. IEEE 1588 defines value ranges for the standard set of clock characteristics. The Best Master Clock (BMC) algorithm determines which clock is the highest quality clock within the network. The BMC (grandmaster clock) then synchronizes all other clocks (slave clocks) in the network. If the BMC is removed from the network or is determined by the BMC algorithm to no longer be the highest quality clock, the algorithm then redefines what the new BMC is and adjusts all other clocks accordingly. No administrator input is needed for this readjustment because the algorithm provides a fault tolerant. |
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