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)