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About PresenTense Time Server
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PresenTense Time Server - Advantages at a glance

· Accurate and reliable ( microsecond accuracy, 24/7 availability )      
· Easy to install and maintain ( most users up and running in less than a minute )      
· Versatile ( able to use almost any reference time source including GPS and internet time servers )      
· Low total cost of ownership ( support included meaning no yearly support fees )  

PresenTense Time Server is a multi protocol time server designed for PresenTense time clients. PresenTense Server incorporates both client as well as server components. This means you can use PresenTense Server to synchronize your PC to a primary time source such as an atomic clock on the internet and offer time services to clients on your local area network. PresenTense server also allows synchronization to GPS receivers via RS-232 and the NMEA 0183 protocol.

PresenTense Server operates three server components concurrently on the ports shown below :

1. Port 123 UDP ( SNTP - RFC 2030 )  
2. Port 37 UDP ( TIME - RFC 868 )     
3. Port 37 TCP ( TIME - RFC 868 )  
4. Port 123 UDP ( NTP3 / NTP4 - RFC 1305 ) Free Plug-In  

This feature enables you to operate time clients on your network using different time protocols simultaneously depending on your requirements for accuracy. To obtain the latest version of our NTP4 plug-in for PresenTense Server free of charge at any time, kindly email us at

PresenTense Server features include :

·Multi Protocol Support  

When operating as a secondary time server, PresenTense Server can synchronize to primary, network time servers of the following protocol families :

2. Network Time UDP  
3. Network Time TCP  

·GPS Receiver Support  

When operating as a primary time server, PresenTense Server can synchronize to GPS receivers via the PC's serial port and the NMEA 0183 protocol. In order to be compatible with PresenTense Server, GPS receivers must emit the GPRMC NMEA sentence (recommended minimum coordinates) at one or two second intervals. Special support is included for the Garmin GPS 2 Plus and the Garmin 38 hand held GPS receivers. You may use either PresenTense Server's native GPS support or the GPS support furnished by the NTP4 plug-in's reference clock support.


An automatic fail-over mechanism switches to a redundant network time source if the primary time source becomes unavailable (only available when synchronizing to a primary network time server).

·Email Alarm Action  

PresenTense Server can notify you by email if the time source becomes unavailable or critical errors are encountered during operation (SMTP only) .

·NT Service  

PresenTense Server operates as an NT service - invisibly in the background. Configuration changes are made via the PresenTense Server applet in the system control panel.

·Highly Customizable  

PresenTense Server features advanced configuration options, including the ability to evaluate the accuracy of its time source to within milliseconds.


Initial setup and later configuration via the control panel require administrator privileges. This minimizes the risk of tampering with system parameters by unauthorized users.

·Remote Monitoring and Administration  

PresenTense Server may be administered fully by remote and monitored over the network to ensure accurate time keeping. Please check for availability of monitoring software.

Please note that while PresenTense Server should work with other time clients that comply with the relevant RFCs, the software has only been tested with PresenTense time clients, and no support is available for the operation of PresenTense Server with non PresenTense time clients.


Microsoft Windows and Windows NT, Windows 2000 and Windows XP are either registered trademarks or trademarks of Microsoft Corporation. No associations are implied. Garmin 38 and Garmin GPS 2 Plus are registered trademarks or trademarks of Garmin Corporation.

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