Brandywine NFS-221 OCXO Network Frequency Standard • GPS 1PPS Generator • NTP Server


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  • The NFS-221 is a precision time and frequency standard that uses the Global Positioning System (GPS).  It is designed for use in WI-FI, Wi-Max, satellite communications, telecommunications and military communication applications.
  • The NFS-221 utilizes a high performance 16 channel GPS receiver. An automatic position-averaging feature enables the best use of GPS when operating in a fixed location.
  • The NFS-221 is fitted with an internal back up oscillator that is continuously calibrated to GPS using an advanced algorithm, providing optimal frequency control of the oscillator. This ensures that the highest time and frequency accuracy is maintained if no satellites can be tracked, and ensures an ultra stable, low noise frequency reference.
  • The NFS-221 includes a precision OCXO internal frequency standard.
  • The NFS-221 provides “at a glance” status indication via front panel LED’s and can be integrated with other management systems using Ethernet and serial ports.
  • The NFS-221 generates 1PPS signals compatible with ICD-GPS-060.
  • The integrated Ethernet interface provides Network Time Protocol (NTP) synchronization to other connected computers. In addition to NTP, the NFS-221 Ethernet interface contains a built-in web server that allows the NFS-221 to be controlled using a standard web browser such as Internet Explorer. Simple Network Management Protocol (SNMP) allows easy integration of the NFS-221 with industry standard network management systems.
  • The NFS-221 provides eleven 1PPS time mark outputs. A unique feature allows precise controlled delays to be inserted into these outputs to compensate for cable- and other propagation delays.
  • Compensation delay is independent for each output and has <1ns resolution.
  • Serial time code outputs are provided to allow time synchronization to be distributed to computers, displays, and other equipment requiring precision time.
  • All outputs are provided with activity detectors. Loss of any output is indicated by means of an individual front panel alarm LED as well as through the network interface or a discrete alarm output.


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