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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"

Connections

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.

SMA for connection to GPS antenna

This includes a 5V DC phantom voltage supply for the active antenna.

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)

NMEA

Ericsson uses some extensions to the typical standard NMEA sentences. For more information, see This scientific thesis about emulating an Ericsson GPS receiver twoards a RBS

$PERC,GPppr,246398,01024,00050,00,3,0*4E
$PERC,GPsts,0,0,0,1111*7B
...
$PERC,GPppr,246409,02113,00050,00,3,0*47
$PERC,GPsts,1,0,0,1111*7A
...
$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64
$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01
$PERC,GPppr,246435,02113,00050,06,0,0*4D
$GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C
$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79
...
$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54
...
$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64
$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01
$PERC,GPppr,246435,02113,00050,06,0,0*4D
$GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C
$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79
...
$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54

Further reading

http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf

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