ATX QFMN Installation & Operation Manual - Page 13

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CHAPTER 5: OPERATIONAL SET-UP

OPERATIONAL SET-UP

5.
Operational Set-up
After attaching power and securely mounting the QFMN device, connect the forward optical input (labelled FORWARD
OPTICAL INPUT) ensuring that the optical connectors are kept free of contaminants. If applicable, connect the return path
optical connector (labelled RETURN LASER).
If installing a QFMN Node with an integrated WDM for bidirectional communications, only the FORWARD OPTICAL INPUT
connection will be utilized for both forward and return transmission.
Connect the forward RF output (labelled FWD. OUTPUT) using a 75 Ohm F-style connector.
The optical input range of the QFMN device is -4 dBm to +4 dBm. The recommended operating range of the QFMN device
is -2 dBm to +2dBm. Optimum performance of the QFMN device is specified with 1mW (0 dBm) of optical input power to
achieve the stated specifications. Optical inputs which are less than -2 dBm or above +2 dBm will result in slightly decreased
RF performance of the QFMN device.
As shown in Figure 1 below, a 10-bar LED located inside the unit provides a quick indication of forward optical input power.
When the LED lights GREEN, you are within the recommended operating range of the node (-2 dBm to +2 dBm) as shown
in the figure below. When the LED lights either YELLOW or RED you are outside of the recommended operating range and
should decrease or increase optical input power as needed until the LED displays GREEN.
-2 dBm to +2 dBm
q
q
q
Figure #1: Forward Optical Input LED Bar Graph
After connection of the forward and return optical connections into the QFMN device and verifying the correct optical input
power, RF tilt and gain adjustments can be made to help achieve the required output slope and output RF levels. The locations
for the tilt and gain controls are shown below on the logical schematic labelled Figure 2.
Utilize the -20 dB test point to measure the FWD path gain and slope.
A -20 dB TX test point, located on the side of the unit can be utilized for setting up the return path.
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