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The DDA-4006 270 Mb/s serial digital video
distribution amplifier provides the user with a single
standard module to cover a wide range of distribution
and monitoring functions for ASI or SDI signals.
The DDA-4006 supersedes the DVA-3006 and
provides all of its predecessor's functions together
with the added option of a Simple Network
Management Protocol (SNMP) monitoring module
for use with IRT's SNMP system frame.
Due to the fact that standard loop through techniques
used in the analogue domain are unsuitable to the
digital domain most digital equipment comes with no
facility to route the input signal to other locations. As
a result a DA is required at almost every point in the
digital chain.
Serial digital signals also suffer severe deterioration
over relatively short cable distances. The DDA-4006
provides a means of extending the working distances
that can be achieved by equalising and retransmitting
the data mid route.
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The DDA-4006 may also be used to provide input
equalisation for devices not having this feature, as
most unequalised inputs will only support cable
lengths of less than 20 metres.
Frequent re-clocking of serial digital signals can lead
to serious increases in jitter with resultant data errors.
The DDA-4006 does not include re-clocking so as to
minimise these errors, leaving re-clocking to be done
by the receiving device. For applications requiring
reclocking the DDA-4007 should be used.
An optional rear assembly, ZDA-4006RL (sold
separately), provides a bypass relay to switch the
Input (SK1) to Output 1 (SK2) in the event of a
power failure. When this bypass rear assembly is
used, number of outputs is reduced to 6.
The DDA-4006 is designed to fit IRT's Standard
Eurocard frame as well as IRT's 4000 series frame
for use with IRT's SNMP system and may be used
alongside any other of IRT's analogue or digital
Eurocards.
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