Description ONLY available for purchase in USA & Canada. The TimeMachines® TM3000A GNSS NTP/PTP Network Time Server represents a complete re-design of our current technology. It supplies accurate time for computers and time keeping devices on the network. Supporting both Precision Time Protocol (PTP) and Network Time Protocol (NTP), a Stratum 1 time source is available on a local network with no need for an internet connection. It uses an active multi-constellation GNSS antenna to maintain the current time as broadcast by worldwide satellites including GPS, GLONASS, Galileo and BeiDou. In addition, a highly stable OCXO reference clock is included allowing it to serve time if GNSS lock is lost for periods of time. Actual Product Size: 6½” x 1¼” x 6⅜” Included with each TM3000A purchase: 12V Power Supply •  GNSS Patch Antenna •  Quick Setup Guide •  Rubber Grips Additional TM3000A Documentation and Information: TM3000A Manual TM3000A Brochure TM3000A 10MHz Allan Deviation Plot TimeMachines Time Server Accuracy Paper Outdoor Antenna Products Configuration Guide Network Time Server Comparison FeaturesTM1000ATM2000BTM2500CTM3000A Source of Time ServedUS GPS SatellitesUS GPS SatellitesUS GPS SatellitesGNSS - US, RU, CN, EU Stratum LevelStratum 1 (GPS)Stratum 1 (GPS)Stratum 1 (GPS)Stratum 1 (GNSS) NTP requests per second