VDS 2200 TX, VDS 2210 TX and VDS 2240 TX
1. General description
A VDS 22x0 TX unit converts a composite video
signal into an optical equivalent to be transmitted
over optical fibre. Additionally, it will optically
receive and transmit data signals, converting these
into respectively from the electrical equivalents.
Optical data transmission does not depend on the
presence of a video signal. All signal transmission
is transparent; video signal levels are held in check
by video clamping.
The VDS 2200 TX, working with an optical
wavelength of 850 nm over multimode optical
fibre, and the VDS 2240 TX, which works with
1300 nm over single-mode fibre, use separate fibres
for video/data transmission and data reception
respectively.
One multimode optical fibre only is used by the
VDS 2210 TX. This unit transmits video-optical
and data signals at 850 nm and receives data-optical
signals at 1300 nm.
Electrical data I/O is full-duplex RS-485 (RS-422,
current loop/TTY and biphase compatible) using
four wires, or half-duplex using two; tri-state
detection is automatic. Apart from setting up and
wiring for one of these connection types, no
adjustments need be made on installation.
A status LED indicates the operational status of the
optical data input.
These stand-alone units need a PSA 12 DC; for
harsh environments a PSU 12 DC is recommended.
Optical Video Transmitters/Data Transceivers
USER MANUAL
2. Indications and connectors
VDS 22x0 TX indications (on top of the housings)
and connectors, distributed over a 'front' and a 'rear'
panel (see also figure 1) are listed in table 1.
o
VDS 2200, 2240 TX front
→
(ST connector)
o
←
(ST connector)
2-pin mini-Combicon connector DC power supply
o
VDS 2210 TX front
↔
(ST connector)
o
Rear panel, all models:
←
VIDEO
BNC connector) Composite video output
(
o
→
DATA (Combicon
conn.)
o
←
(Combicon
conn.)
Status indicator LEDs:
*DC (green)
*DR (green)
Table 1. VDS 22x0 TX indicators and connectors
Figure 1, top to bottom:.
VDS TX front (2-fibres), rear, and plan (2-fibres). One-fibre
units do not have the outer optical connector.
Optical video/data output
Optical data input
Optical video out & data I/O
RS-4xx out
RS-4xx in
Power supply OK
Data received (optical)
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