NTP Network Time Server Utilizing GPS, MSF, DCF-77 Reference Clocks
TimeTools SR7110 NTP Network Time Server can utilize a number of different hardware reference clocks to provide a high degree of accuracy. The GPS system is a global satellite based positioning and navigation system that can also be used a source of very accurate time. GPS signals can be received anywhere on the surface of the planet. All that is generally required is to install a GPS antenna with a reasonably good view of the sky. Ideally, a GPS antenna should be located on a rooftop with a full 360-degree view of the sky. However, often an antenna will work located on the side of a building or in a window. In many cases even an indoor located antenna will provide an adequate signal lock.
The MSF radio signal can be received with a tuned 60KHz radio antenna throughout most of the UK and North-Western Europe. The signal is broadcast from a single transmitter located in Anthorne in Cumbria. Generally, the MSF signal can be received with an indoor located antenna. Timing down to a few milliseconds can be achieved with the MSF time code signal.
The DCF-77 radio signal can be received with a tuned 77.5 KHz radio antenna throughout Germany and most of Central and Northern Europe. The signal is broadcast from a dual transmitter array located near Frankfurt. Generally the DCF radio signal can be received with an indoor located antenna. Timing down to a few milliseconds can be achieved with the DCF time code signal.
TimeTools SR7110 NTP Time Server
TimeTools SR7110 is a a stratum-1 NTP server which can receive accurate timing information from GPS, DCF-77 or MSF reference clocks. It provides a small corporate network with a highly accurate and secure source of time.
A reduced Linux kernel, stored in flash memory, provides the operating system required to run the standard NTP daemon.
The appliance has a very low power consumption, runs cool and is thus very reliable.
All models accept a standard 5 volt GPS antenna utilizing coax cable with TNC type connectors.
The device can be easily configured using a web browser, such as Google Chrome or Internet Explorer.
Multiple devices can be peered together to share time and to provide a high degree of redundancy.
The SR series can accept a list of external or internet based NTP time servers to provide stratum 2 operation. Stratum 2 operation can also be used a fall-back from GPS stratum 1 operation if GPS lock is lost.
All models are both NTP (Network Time Protocol) and SNTP (Simple Network Time Protocol) compliant.
All models have universal 100-250VAC 50-60Hz power supplies. They are also available with 9-36 VDC and 85-250 VDC IN options.
The appliances are supplied in an attractive, but hard-wearing, 1U-high 19-inch rack-mountable aluminium enclosure
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