Nevion LB-OE Rev.E - Manual (Page 8)

LB-OE Rev. E
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4 Connections
The Flashlink LB-OE has a dedicated connector module: LB-EO-C1. This module is
mounted at the rear of the sub-rack. The module is shown in the figure below.
Monitor Fiber optical
output
RF input
LNB power supply GPI
Figure 3: Connector module for L-band.
In typical use, an LB-EO / LB-OE module at each end will be used. An LNB is
connected to the F-connector of the LB-EO, and a satellite tuner is connected to the F-
connector of the LB-OE. The voltage/22kHz output from the satellite tuner, cannot be
transferred on the fiber between LB-EO and LB-OE, because this signal goes the other
way. The LB-OE can nevertheless detect voltage and/or tone, and put them to the GPI
output on the LB-OE. Using a separate communication line (two digital signals using
D422MG or similar), these signals can be transferred to the LB-EO. Another alternative
is controlling the LB-EO directly using either Gyda or GPI inputs.
The LB-OE will always detect the voltage/tone from the satellite tuner or other
equipment, and set the GPI according to the detected tone and voltage. A 22 kHz tone
on top of the LNB power supply indicates high band (11.7-12.75 GHz) and no tone is
for low band (10.7-11.7 GHz).
Vertical polarization is chosen with a voltage less than 15 volts, typically 13 volts. Most
LNBs will set vertical polarization within a voltage window (for instance from 11.5 to
14.2 volts dependant of the LNB). Accordingly the horizontal polarisation is voltage
greater than 15 volts, typically 18 volts (for instance from 15.8 to 19.0 volts). If the
voltage is near 15 (for instance between 14.2 and 15.8), the polarization will be
uncertain. The example voltages are LNB manufacturer dependant; please check the
user manual for the LNB voltage thresholds.
4.1 Mounting the connector module
The details of how the connector module is mounted, is found in the user manual for
the sub-rack frame FR-2RU-10-2.
This manual is also available from our web site: http://www.nevion.com/