Experience in the Development and Implementation of Time-Frequency Synchronization Systems on Telecommunications

Time synchronization systems in telecommunications must be connected to the reference time scale of the UTC Laboratory or national time and frequency standard. GNSS receivers are most often used for this. However, possible violations of the reception of these signals, as well as cases of their substitution (spoofing) force us to look for alternative options for obtaining the time scale via terrestrial communication channels. One of the solutions is the use of special equipment for the distribution of time signals (ARSV) complete with a time server that receives, stores and transmits time signals to the consumer in any format - NTP, PTP, 1PPS + ToD, etc. The purpose of this article is to present the experience of implementing time-frequency systems using terrestrial communication channels with UTC time scale sources.