Methods of synchronization of frequency and time in multiservice macronetworks
DOI №________________
Abstract
The article shows the architecture of the multiservice macro network of the mobile operator and the network synchronization scheme. The current trend in the development of the primary network of a multiservice macro network is an increase in the role of network synchronization and this trend will continue in the near future. Moreover, synchronization problems are not limited only to the primary network, but are of great importance in the construction of access networks with the calculation of different technologies and protocols implemented in a multiservice macro network. The topical issues of network synchronization in a multiservice macro network are noted, namely: - synchronization tasks; - a set of normalized parameters and methods for measuring them; - the amount of control of the synchronization parameters. The need to provide accurate time signals for a multiservice macro network is considered. The main methods for providing network synchronization are given, which include: Sync-E mechanism, functioning at the physical level, independent of the network load and allowing the synchronization signal to be transmitted through the transit devices; PTP channel protocol that provides both frequency and time synchronization, but the stability of the propagated signal depends on the network utilization level, as well as on the distance between network nodes and the number of transitions; NTP protocol that works at the application layer and is widely used, as a rule, for time synchronization in packet networks. The results of measurements of the stability parameters on the sections using Sync-E, the protocol of precision time, and also the network time protocol are shown.
Keywords: multiservice macro network, network synchronization, time-accurate signals, precision time protocol, network time protocol.
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