GPS 02 » History » Revision 4
Revision 3 (laforge, 07/06/2020 12:10 PM) → Revision 4/15 (laforge, 07/06/2020 12:15 PM)
h1. GPS 02 01 This is the Ericsson original GPS receiver that can be used to provide a clock reference to equipment like [[DUG 20]] or [[DUL 20]] or also the [[SIU 02]] It is also called "NCD 901 41/1" h2. Connections h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU The unit has two RJ45 sockets. They appear to have identical functionality. The pin-out is as follows: |_.Pin|_.Name|_.Comment| |1|1PPS-|RS-422 1PPS GPS -> DUx| |2|1PPS+|RS-422 1PPS GPS -> DUx| |3|RxD|RS-422 in direction DUx -> GPS| |4|TxD+|RS-422 NMEA in direction GPS -> DUx| |5|TxD-|RS-422 NMEA in direction GPS -> DUx| |6|RxD|RS-422 in direction DUx -> GPS| |7|12V|supply voltage from DUx -> GPS| |8|GND|supply voltage from DUx -> GPS| The supply voltage pins on a [[DUL 20]] only provide 3.1V until the GPS receiver is detected by means of a 1kOums resistor between 12V and GND. At that point, the DUL sources the full 12V. The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix. h3. SMA for connection to GPS antenna This includes a 5V DC phantom voltage supply for the active antenna. h2. LED There is a single green LED. * after power up, it takes some dozens of seconds until it first becomes active * slow green blinking light indicates powered up but no GPS fix * steady green light indicates powered up and GPS fix (1PPS output active)
