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WAYS OF FORMING A PRECISION TIME SCALE OF THE NATIONAL COMMUNICATION NETWORK
Anatoliy V. Ryzhkov, Moscow Technical University of communications and Informatics (MTUCI), Moscow, Russia,
ryjkov.anatoly@yandex.ru
Mikhail L. Schwartz, Moscow Technical University of communications and Informatics (MTUCI), Moscow, Russia,
Mschwartz@smsync.ru
Abstract
Over the past two decades, in world practice, much attention has been paid to the distribution of signals of a universal and accurate time, formed by state (national) standards of frequency and time. Herewith the transmission of signals through fiber-optic communication lines (FOCL) is considered with the addition of signals from satellite radio navigation systems (SRNS). The article summarizes the experience of comparing and reproducing the time scale of telecommunication networks master clocks with the national scale (UTC (SU) in Russia) both through the SRNS (GLONASS/GPS) system and through the fiber optic link with direct connection to the State (national) standards of time and frequency. Two main directions of reducing the error in the reproduction and storage of frequency and time units in the consumer are considered:
• creation of new technical means (frequency and time standards and equipment for external comparisons);
• o introduction of precision distribution media and equipment for comparisons of slave clocks.
The analysis of the improvement of the reference sources of frequency and time used on communication networks is carried out based on the ITU-T Recommendations of the G.81xx and G.82xx series.
The possibilities of fiber optic link for the delivery and distribution of timing signals are evaluated, an univocal conclusion is made on the priority of their use where possible. The article presents a multilevel system for distributing and delivering timing signals to a consumer via FOCL, the appearance of a modern (promising) the coherent primary reference time clock (cn-PRTC), and a structural diagram of a time-frequency provision of a public communication network for creating a coherent time scale system.
Keywords: time scale, network synchronization, network time protocols (NTP, PTP), methods of comparison and distribution of time scales, backbone and mobile communication networks, coherent network.
References
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Information about authors:
Anatoliy V. Ryzhkov, DPhil, Scientific-research part, Moscow Technical University of communications and Informatics (MTUCI), Moscow, Russia
Mikhail L. Schwartz, PhD, Scientific-research part, Moscow Technical University of communications and Informatics (MTUCI), Moscow, Russia