The laser diode (tx) monitoring point shows the actual laser diode current. 100mV relates to
10mA laser current against GND. The pin diode (rx) monitoring point shows the actual optical
receive level. 100mV relates to 100uW optical input power against GND.
DC interface pin out
Pin
Alarm contacts (DSUB-9 male)
Description
1
NC
not connected
2
NC
not connected
3
NC
not connected
4
+9..24V / 260mA@12V
Power Supply Input. te .ts 5
7
TX Alarm
Open Collector max. 24VDC/50mA
8
RX Optical Monitor
100uW = 100mV
9
RX Alarm
Open Collector max. 24VDC/50mA
On the front side the in-/ out RF-connectors are placed.
In the standard configuration all RF-connectors are SMA/ 50Ohm female connectors.
ATTENTION: Optical Radiation!
If connected to a power supply, the sat-nms LFTRX provides invisible laser radiation. The source
is class 3R Laser diode as defined in DIN EN 60825-1:2001-11. P0=2mW, Lambda=1310nm.
Never look into fibre-optical components like connectors or fibres. Use an infrared viewer, optical
power meter or fluorescent screen for optical output verification.
FC/APC FOL-connectors are used. They are placed on the back side of the enclosure. Pay
attention to the type of the connectors, only use single mode APC fibres with 8° angled polish.
Otherwise the connectors or the fibres might be damaged.
Do not allow any dirt or foreign material to get into the optical connector bulkheads. This may
cause damage to the polished optical connector end faces.
Before lining up the optical links, you have to take care that the input signals do not exceed the
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www.satnms.com
LFTRX-UM-2107 Page 8/12