04/2019 - AE/V1.16
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Technetix Group Limited
4.3 Upstream connection
The DBTX-A-1 is a dual module and has two upstream laser board slots� In the case of a DBD
or DBE you can use the second slot for a secondary laser or, when configured as a hybrid mixture, you
can use a combining board (DBLB-CB-1) to combine the RF from the secondary downstream feed
over a single laser�
Connect the upstream laser to the pigtail or WDM module�
Remove the cover from the transmitter module so that the slots are visible�
A test point is located on all laser boards, which will align your Optical Modulation Index (OMI) to a
satisfactory level� Depending on the number of upstream channels, you can theoretically divide the
100% OMI available over the respective channels� The higher the OMI percentage, the better your
uplink� The upstream RF level can be measured by using an MCX to F-female adapter (DBLB-TP-CON)
connected to a spectrum analyzer�
