VBS 2020 TX
and
VBS 2050 TX
Stand-alone optical video transmitters
USER MANUAL
1. General Description
An optical video baseband transmitter VBS 2020 or
2050 TX will convert an electrical composite video
signal into an optical, intensity modulated
equivalent, using AM techniques. The VBS 2020
TX uses an optical wavelength of 850 nm and
needs a multimode optical fibre connection, while
the VBS 2050 TX transmits at 1300 nm and will
work with single-mode or multimode fibre. In the
latter case, at least 10 dB link attenuation is
required.
VBS 2020 TX and 2050 TX stand-alone trans-
mitters are designed for use in combination with
Optelecom-NKF optical receiver modules from the
VBS 2000 series, i.e. the VBS 2010/2020 and VBS
2040/2050 single and triple receivers, respectively.
The units may be powered with Optelecom-NKF's
PSA 12 DC power supply; for applications in harsh
environments, a PSU 12 DC is recommended.
Other technical specifications are listed in section 4.
2. Indicators and connectors
Figure 1 shows the signal connection facilities and
the indicator on the signal I/O side of a VBS stand-
alone transmitter. The green LED (2) signals
POWER ON. The optical output has an ST
connector (1), while a 75
Ω
BNC connector (3) is
used for input.
The other side of the unit carries a DC power
connector (4, see figure 2). The negative terminal is
tied to the housing.
3. Installation and maintenance
In some cases, the unit can be fitted inside a camera
housing. Please use the correct power supply
voltage (see section 4, Technical Specifications).
In order to maintain reliable operation of the
module, please observe the following:
- Prevent dust from collecting on the unit
- Protect the module against moisture.
If the output from an optical connection fed by this
module is too low, please check the optical link
first.
Safety and EMC information will be found in the
final section of this document.
2
1
3
Figure 2.
Stand-alone transmitter VBS 2020 or 2050 TX, with
DC power connector. Please note that the negative
terminal is tied to the housing
Figure 1.
Stand-alone transmitter VBS 2020 or 2050 TX,
perspective view. See section 2 for explanation.
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