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The MMM-4230 and MMX-4230 are part of a family
of data transcoders for converting between the
commonly used MPEG2 Transport Stream formats
for video distribution in the broadcast industry.
With the MMM-4230 up to four ASI and one RS422
data signals can be multiplexed together and
converted into an framed or unframed DS3 signal for
transmission down a single 45 Mb/s G.703 line.
The MMX-4230 converts and demultiplexes the
45 Mb/s G.703 signal back into the original four ASI
signals (at their original rates) and the RS422 data
signal.
An on board switch on the MMM-4230 sets the
maximum data rates for each ASI input allowing the
efficient use of the available bandwidth and for
protection against overuse of the bandwidth by the
other channels. Total maximum data rate up to
43.5 Mb/s is allowed. Temporary packet stuffing is
used to automatically bring the rate up to 45 Mb/s.
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Inputs are automatically equalised for lengths of up
to 300m of Belden 8281 or equivalent cable.
RS422 9600 Baud uni-directional data may also be
sent on the same link.
Front panel indication and relay alarm on the MMM-
4230 transmitter shows if there is an input data rate
violation. Corresponding alarm on the MMX-4230
receiver shows a loss of G.703 input.
An optional Simple Network Management Protocol
(SNMP) plug-in module is available for remote
monitoring of input and output status, control and
alarm states.
The MMM-4230 and MMX-4230 are designed to fit
IRT's standard Eurocard frames 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.
Note: Also available in a 34Mb/s G.703 version.
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