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04/2019 - EN/V9
Technetix Group Limited
Product user manual
DBE-1200S
5.3 Upstream connection
The DBTX-A-1 is a dual module with two upstream laser board slots. In the case of a DBD or DBE you can use the second slot
for a secondary laser or you can use a combining board (DBLB-CB-1) to combine the RF from the secondary upstream 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 can be used to set the 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 the uplink performance. The upstream RF level can be measured by
using an MCX Connector. Technetix part number 19011201 is an MCX to F-connector adapter.
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
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