Prospects of using NTP protocol in modern communications networks

DOI №______

Abstract

In article the NTP protocol (Network Time Protokol) which is widely used on communication networks for providing the equipment with tags of the exact time is considered. Possibilities of the network NTP protocol which is possible for applying as well to synchronization of the equipment are given. Planning of subnets on the basis of the NTP protocol is considered. System planning of subnets of NTP is not even more difficult for big networks, than design of services on the basis of other subnets (mail or service of domain names), but in distribution of time there are some specific features. There are several design criteria, as a rule, of contradictory: ensuring the set accuracy, the steady account of time in the conditions of improbable refusals and overloads, minimization of dependence on parameters and placement of servers, simplicity and convenience of configuration of clients. Also methods of monitoring of quality of basic signals of synchronization are presented. The original scheme consisting of three PTP servers, which does not contain the most unreliable element — the mechanism for switching to the reserve proposed in the article. The proposed scheme is the most optimal for building synchronization networks for 4G technology. Maximum efficiency of using PTP servers achieved in this scheme. Each of the servers is not just in «hot standby», but is active and it contributes directly to the stability of the reference signals. The method of mutual monitoring of the distributed primary devices of synchronization with the purpose of their effective use on condition of the combined use of the built-in and allocated networks of synchronization is developed.

Keywords: NTP (Network Time Protokol); synchronization; packet networks; measurement of stability parameters; PDV (Packet Delay Variation); monitoring system.

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