When you connect the L-Band Optical Link chassis, please consider the following:
J1 DC-Power Interface is a standard 9-pin SUB-D socket-connector. This connector contains
the alarm contacts of the internal failure open collecttor transistor, the signal monitor and the
DC-Power Supply Input. To meet mentioned EMC standards, use double shielded twisted
pair CAT7 S/FTP Network cable, e.g. DRAKA UC900 SS27 Cat.7 PUR. Take care, that cable
shielding is connected properly.
RF-In/ Out RF-Interface The input and output RF-connectors are all SMA/50Ohm female.
Use double shielded coaxial cables, e.g. RG223, only.
Optic TX/ RX Optic-Interface The fibre optic connectors are FC/APC types. It is essentially to
use single mode cables with 8° angled polish for proper function.
The Alarm and data connectors of the sat-nms LFTRX chassis are located at the front side of the
enclosure up right. The figure below illustrates the location of the connectors and the pin out.
To meet mentioned EMC standards, use double shielded twisted pair CAT7 S/FTP Network cable,
e.g. DRAKA UC900 SS27 Cat.7 PUR, for connecting network, serial and alarm interfaces. Ensure
that the shield is connected properly.
DC Power Supply
The unit needs 9..24V DC at the corresponding pins of this interface. The LED PS shows the
presence of the power supply.
Alarm
Open collector contacts represent a fault state of the unit. With solder jumper SJ1 and SJ2 the
polarity of the alarm interface can be chosen (NC or NO at Alarm). The LED LD shows the status
of the Laser Diode Alarm (green light means current is in the current limt range (10 to 45.5mA).
The LED PD shows the status of the PIN Diode Alarm (green light means the optical level is above
220uW).
Monitoring
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www.satnms.com
LFTRX-UM-2107 Page 7/12