Time Server TOP Time Server Pro. Time Server Time Display Download FAQ Distributors Time Server TS-2560 High-End Model with Power Redundancy Holdover accuracy: +/-10ms/day Time source: GNSS TS-2220 Feature-Rich Standard Time Server Holdover accuracy: +/-100ms/day Time source: GNSS TS-2335 Multipurpose NTP Time Server Holdover accuracy: +/-10ms/day Time source: GPS