© Siqura 2017
Version 090902-1g
TETRA42x0TX&RX (MW10)
1. General description
TETRA 42x0 (4210 for multimode, and 4250 for single-
mode) digital-optical multiplexer/demultiplexer systems
can transmit signals through four unidirectional,
independent composite video channels and one bi-
directional data channel using one optical fiber per
system. Video and data/audio input signals are sampled
and digitised with 10-bit accuracy.
TETRA 42x0 TX unit receives input via the four BNC
connectors. It then converts and combines the four
channels of composite video with the data channel into
one digital data stream. This, in turn, is converted into an
optical signal, with a wavelength of 1310 nm. The
TETRA 42x0 TX also converts and decodes an incoming
1550 nm digital optical signal from the mating RX unit
that includes the data in the opposite (return) direction.
The TETRA 42x0 RX receives, converts and decodes
the video and data signals arriving through the optical
fiber via a 1310 nm optical carrier. It also converts and
serializes the incoming data signal and transmits this
information optically in the opposite direction towards
the complementary TX, using an optical wavelength of
1550 nm.
The composite video channels are digitally clamped after
being AC coupled at the inputs. The digital clamp is
compatible with NTSC and PAL sync timing. The video
channels are not compatible with non-video (NTSC and
PAL) signals.
The data channel I/O compatibility (RS-232, RS-422,
RS-485-4W,
and
RS-485-2W)
and
termination
configuration is selectable via an on board 10 position
dip-switch
. See Data Configuration.
Front panel status LEDs indicate DC power OK, video
signal presence, local and remote link synchronisation.
TETRA 42x0 units are single-width (7TE) Eurocard-
sized modules and should be used in combination with
MC 11 or similar power supply cabinets.
Stand-alone models (/SA option, see supplementary
/SA-2 manual) need separate 12 Vdc power supplies.
A TKH Security PSA 12 DC-25 would be suitable.
Figure 1. Tetra 42x0 RX Front Panel. TX panels look similar,
with video inputs instead of outputs. See Table
1.
TETRA 42x0
Four Channel Digital Video Multiplexer with Two-Way Data
USER MANUAL
