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Precision GPS/GNSS based NTP Network Time Servers

Brandywine Commnications Site

ENTA II - Enhanced Network Time Appliance

The ENTA-II Enhanced Network Time Appliance is NENA Compliant GPS & IRIG referenced Master Clock that provides a clear UTC or local time display along with a broad suite of precision programmable time outputs.

The ENTA-II Enhanced Network Time Appliance is a full function NENA Compliant GPS & IRIG referenced Master Clock that provides a clear UTC or local time display along with a broad suite of precision time outputs that include : NTP v3, IRIG B, IRIG E, Have Quick, 1PPS and 10MHz.

The ENTA includes both a built in GPS receiver and an IRIG B decoder, accommodating multiple time reference inputs for high availability.  This is supplemented by a built in disciplined oven controlled crystal oscillator that provides continuous holdover timekeeping accuracy in the event that GPS or IRIG reference signals are lost.

A built in SNTP web-server provides a secure user friendly interface for configuring the unit while internal signal level monitors, continually check all outputs to enable rapid fault detection and isolation.

These units are typically specified for secure high integrity installations and are readily integrated as fully dual redundant systems using standard signal distribution units.  The standard ENTA-II is NENA compliant and is available both as a standard commercial product or as a qualified product in some military applications.


   •  Dual time reference inputs - GPS and IRIG-B

   •  Multiple Time Code Outputs, IRIG B, IRIG E, Have Quick

   •  Dual port NTP Network Interface 10/100BaseT  (NTPv3 [RFC 1305]

   •  High stability disciplined OCXO as standard

   •  Automatic signal fault monitoring and detection with relay contact and SNTP Traps

   •  Compact 1U Rack Mount

   •  Holdover accuracy < 1µs / hour

   •  10MHz & 1PPS

   •  AC or DC power options

Output Options

•  1 x 1PPS + 1 x 10 MHz

•  2 x NTP Network ports

•  1 x IRIG B + 1 x IRIG B / IRIG E + 2 x RS-232 & 2 x RS-422 user definable serial time codes

Typical Applications

The ENTA-II is commonly specified where high reliability, long holdover and cyber security are key considerations in the network application.  

These high integrity units are common place and thoroughly proven worldwide in network timing applications where traceable, precision time stamping and time distribution is required. The unique oscillator design provides high accuracy over long periods of holdover.

The robust design and unrivalled build quality delivers exceptional performance and trouble free product field longevity.  Commonly specified in air traffic control systems, security systems, and communications networks.

ENTA-II : GPS & IRIG B Referenced Multi-port NTP Time Server

ENTA-II datasheet