Multiple time source system of NTS–xxxx already improves safety because it protects situation when a single source could fail. But it is also possible to use several NTS–xxxx units simultaneously to improve stability of the time synchronization. In this case all NTS–xxxx units would work independently and fully redundant or in a pool mode. If one server fails another are still working and NTP swaps to the new existing source automatically.

There is actually one more possibility of NTS–4000. You can define up to 3 NTP backup servers for single NTS–4000 unit. In this mode NTS–4000 reminds Stratum 1 as long as one of time sources works fine. But in case of no time source availability NTS–4000 checks backup servers list. If NTP accepts any of them, the NTS–4000 reduces its stratum to N-1 (where N is a Stratum of approved server taken out of the backup list). We advice to specify only Stratum 1 servers on NTS–4000 backup list. This does not let reduce NTS–4000 Stratum below 2.

A true novelty is an option to create cascade NTS servers where one can simulate an antenna for the other. This functionality enables time synchronization of secured LANs with official time from NTP servers available publicly on line in Internet (Public NTP Servers).

NTS-xxxx time server can be used as a support for another NTS-xxxx server, delivering time into a secured LAN isolated from the Internet. This solution requires 2x NTS-xxxx servers working together. In the latter instance, first NTS-xxxx works as an antenna emulator (STRATUM-0) for another NTS-xxxx, enabling safe time synchronization (no TCP IP communication) between.