Hi there, Community friends!
This time, I will share with you IEEE 1588v2. Hope you like!
The IEEE 1588 standard, which is generally called the precision time protocol (PTP), is a precision clock synchronization protocol for networked measurement and control systems. The equipment that complies with IEEE 1588 meets the requirement for the time synchronization precision at the microsecond level.
IEEE 1588v2 time synchronization is a technical revolution and innovation for carrier-class IP network transformation. It meets time requirements of NodeBs, eNodeBs, and RNCs.
To realize time synchronization, IEEE reviewed and approved the IEEE 1588 standard in 2002. The IEEE 1588 standard is available in two versions, namely, IEEE 1588 V1 and IEEE 1588v2. Currently, the IEEE 1588v2 protocol is used.
The objective of this standard is to specify a protocol to synchronize independent clocks running on separate nodes of a distributed measurement and control system to a high degree of accuracy and precision. The clocks communicate with each other over a communication network. The IEEE 1588v2 protocol forms the network into a tree topology according to the clock priority levels to facilitate the management. The protocol generates a master/slave relationship among the clocks in the system. Each node on the subnet has a clock. Within a given subnet of a network, there will be a single master clock. All clocks ultimately derive their time from a clock known as the grandmaster clock (GMC). The majority of the clocks that are distributed in the PTP system are boundary clocks (BCs) and ordinary clocks (OCs). The OC is a clock with only one PTP port for time synchronization or clock synchronization. The BC is a clock with more than one PTP port, each of which provides access to a separate PTP communication path and can be use to transfer the time information.
IEEE 1588v2 Time synchronization
Synchronization means that the frequencies or phases of two or more signals maintain a certain relation. To be more specific, within a valid instance, the phase difference or frequency difference between two or more signals remains in the permitted range. Time synchronization refers to the frequency and phase synchronization.
In Figure 1, in the applications on transmission networks, the IEEE 1588v2 standard provides an approach to 1588v2 time synchronization on a network basis, with a synchronization accuracy in the microsecond range; as well, the IEEE 1588v2 standard helps in transparent transmission of 1588v2 time signals. As such, the IEEE 1588v2 standard, as an alternative to the global positioning system (GPS) or other complex timing systems, can be used to provide 1588v2 time for NodeBs or eNodeBs. PTP nodes support selection and protection switching of clock sources. This ensures that PTP nodes can obtain time synchronization information even after PTP links are faulty.
Figure 1 Time synchronization of NodeBs implemented by the IEEE 1588v2 standard
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