Miscellaneous Projects » Ericsson RBS 6xxx

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h1. GPS 02 01 / GPS 03 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]]

The GPS 02 is also called _NCD 901 41/1_, while the GPS 03 is also called _NCD 901 56/1_

We're not aware of the exact differences between GPS 02 and GPS 03

{{thumbnail(gps02.jpg)}}

{{thumbnail(gps02_side.jpg)}}

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)

h2. 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":http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf

h3. GPS 02

<pre>

$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

</pre>

h3. GPS 03

looks mostly the same, just with a longer sequence of '1' in @$PERC,GPsts@ and with Glonass satellites in addition to GPS?

<pre>

$PERC,GPppr,000465,02048,00050,00,3,0*42

$PERC,GPsts,0,0,0,111111*7B

...

$PERC,GPver,GPS 03 01,NCD 901 56/1,R1B,TU8KBU9552.1544*11

$PERC,GPreh,00:00:00 00/00/0000,Other*24

$PERC,GPppr,000485,02048,00050,00,3,0*4C

$PERC,GPsts,0,0,0,111111*7B

...

$GPGGA,182300.00,5225.38450,N,01327.16970,E,1,16,0.65,37.6,M,44.7,M,,*61

$PERC,GPppr,325399,02225,00050,16,0,0*4F

$PERC,GPsts,1,0,0,111111*7A

$GNGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*15

$GPGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*0B

$GNGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*18

$GLGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*1A

$GPGSV,3,1,10,30,62,073,48,13,64,292,50,05,50,241,48,14,53,138,48*77

$GPGSV,3,2,10,07,29,070,45,20,27,200,45,15,31,297,39,08,15,044,38*70

$GPGSV,3,3,10,18,13,309,28,27,04,010,24,,,,,,,,*75

$GLGSV,2,1,08,75,85,141,47,76,29,214,44,82,11,329,29,72,24,143,26*63

$GLGSV,2,2,08,65,76,164,41,66,40,317,45,74,32,042,43,83,13,012,00*60

</pre>

h2. Circuit board pictures

h3. GPS 03

{{thumbnail(gps03_internal_top.jpg)}}

{{thumbnail(gps03_internal_bot.jpg)}}

h2. Further reading

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