30Technetix Group LimitedRev.1.0.1_0217
5.3 Upstream connection
The DBTX-A-1 is a dual module and has 2 upstream laser board slots. In the case of a DBD or DBE you can use the
2nd 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, this 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.
DBLB testpoint (dBmV) DBLB testpoint (dBµV) OMI (%)
20 80 10
19 79 8.9
18 78 7.9
17 77 7.1
16 76 6.3
15 75 5.6
14 74 5.0
13 73 4.5
12 72 4.0
11 71 3.5
10 70 3.2
9 69 2.8
8 68 2.5
7 67 2.2
6 66 2.0
5 65 1.8
4 64 1.6
3 63 1.4
2 62 1.3
1 61 1.1
0 60 1
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