Miscellaneous Projects » Ericsson RBS 6xxx

h1. NCD 901 60/1 GPS Receiver

The NCD 901 60/1 is a GPS receiver for clock reference purpose, sold as accessory to the [[RBS6402]] eNodeB.

h2. Major internal parts

It consists of the following major parts:

* "Trimble RES 360 SMT GNSS receiver module":https://timing.trimble.com/products/gnss-receivers/res-smt-360-multi-gnss-timing-module/

* "STM32F105 Cortex-M3 Microcontroller":https://www.st.com/en/microcontrollers-microprocessors/stm32f105-107.html

* "MuRata NXE1S0305MC":https://www.murata.com/products/productdetail?partno=NXE1S0305MC isolated DC/DC conveter for phantom power to GNSS antenna

{{thumbnail(ncd90160_pcba.jpg)}}

h2. External interfaces

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h3. RJ45 conenctor to RBS6402

pin-out and signals are yet TBD, but judging from other Ericsson GPS receivers, it is safe to assume 12V supply and RS485 for NMEA.

h3. SMA connector to GNSS antenna

The SMA connector features a 5V/1W isolated phantom power DC supply

h3. LED

The green LED blinks, when the receiver is powered and goes to constant green when the GPS signal is locked. This could also be checked with issuing:

   show ManagedElement=foo,Transport=1,Synchronization=1,RadioEquipmentClock=1,clockState

from the CLI.

When the receiver is locked, the output is:

    clockState=LOCKED

while it is 

   clockState=HOLDOVER

when there is no GPS receiver connected or the device is not locked.

h2. Part Numbers

|_.Part Number|_.Description|

|NCD 901 60/1|GPS Receiver Unit (with RJ45 and SMA)|

|RPM 5132372/2900|RBS6402 GPS Cable (RJ45 + proprietary connector)|

|TSR 432 151/3000|DUS GPS Cable (RJ45 to RJ45)|

|NTB 801 0070/1|Kit consisting of three items above|