Note ! The NTS-dialup userc can skip this chapter unless they purchased extra GPS receiver.

The std. GPS satellite time receiver has been designed to provide extremely precise time (aprox. 50nS). The NTS-xxxx can be also equipped with L1/L2 double frequency GPS receiver (20nS). High precision time is available 24 hours a day around the whole world. The Global Positioning System (GPS) is a satellite-based radio-positioning, navigation, and time-transfer system. The source of time is based on cesium atomic clocks. Time is represented as UTC.

The GPS satellites are not stationary but circle round the globe in a period of approx. about 12 hours. They can only be received if there is no building in the line of sight from the antenna to the satellite, so the antenna unit must be installed in a location from which as much of the sky as possible can be seen.

The hardware of the GPS antenna contains in one box. In a box are placed GPS receiver, frequency converter and basic over-voltage protection. Box is water resistant (IP67) therefore it should stay over water level during rain.

The metal handler should be mounted on top of building and grouded. Please select location of GPS antenna on way it work will be not disturbed by any other radio-transmitter or antennas. We advice to keep min. distance of 5m from other electronic devices as GSM/UMTS trans-receivers, radars, telecoms equipment, air conditions etc. Your GPS box antenna should be mounted solid to avoid strong winds and other bad weather conditions. Water, salt and snow conditions are acceptable under condition the box remind over water level (IP67).

For surge and over voltage protection please refer to NTS-protect*** /available separately/. This module includes special lightning protectors preventing NTS-4000 server from direct and indirect effects of atmospheric discharges and related over voltage defects. The construction of NTS-protect is based upon the rule of voltage compensation in accordance with PN – IEC 61024-1 standard regulations. It stipulates upholding safe levels of over voltage that will not damage the insulation in all protected electrical circuits of the NTS-xxxx server

For connecting antenna (GPS or GPS+DCF77) box we recommend usage of UTP or STP cat. 5 cables (for external environment. use) with standard RJ-45 connector termination (both sides) with standard T568B conductors assignment. Cable should be leaded into antenna box through cable gland. Please use standard Ethernet cramping tooling (not included to NTS-xxxx set) to mount antenna cable connection.

#PIN (RJ45)    Antenna signal      UTC/STP Cat 5 cable

     1                  PPS+                White/Orange

     2                  PPS-                Orange

     3                  TR+                 White/Green

     4                  DCF77-             Blue

     5                  DCF77+            White/Blue

     6                  TR-                  Green

     7                  +VCC               White/Brown

     8                  -0V                  Brown

   GND                GROUND           Not used