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New range of combiner transmitters available from IRT Electronics

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article image MMM-4680 and MMX-4680 combiner transmitters

MMM-4680 and MMX-4680 4 ASI to G.703 (STM-1) Combiner / DeCombiner 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-4680 4 ASI to G.703 (STM-1) Combiner up to four ASI and one RS232 data signal can be combined together and converted into a 155Mb/s G.703 (STM-1) electrical signal.

The sum of the ASI input payload rates can be anything up to 148 Mb/s. Inputs may be 188 or 204 byte packet length, burst or continuous, and may have energy dispersal scrambling, interleaving and/or Reed Solomon bytes included. An individual input may be up to 148Mb/s if the other inputs are unused.

The MMX-4680 4 ASI to G.703 (STM-1) deCombiner separates the 155 Mb/s G.703 signal back into the original four ASI signals (at their original rates) and the RS232 data signal. The ASI outputs are suitable for Single Frequency Network use, in that there is no data rate conversion or PCR restamping of the ASI streams.

Inputs are automatically equalised for lengths of up to 250m of Belden 8281 or equivalent cable. RS232 uni-directional data may also be sent on the same link. It can pass rates up to 38kb/s with any combination of start/stop and parity bits. The data rate does not affect the payload available for the ASI streams.

Front panel indication and relay alarm on the MMM-4680 4 ASI to G.703 (STM-1) Combiner transmitter shows if there is an input data rate violation. Corresponding alarm on the MMX-46804 ASI to G.703 (STM-1) DeCombiner receiver shows a loss of STM-1 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 for the 4 ASI to G.703 (STM-1) Combiner / DeCombiner.

The MMM-4680 and MMX-4680 4 ASI to G.703 (STM-1) Combiner / DeCombiner are designed to fit IRT Electronics ' 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.

Features:

  • Up to 4 ASI and 1 Data stream on one 155 Mb/s (STM-1) G.703 link
  • Automatic Input equalisation up to 250m
  • Suitable for Single Frequency Network (SFN) use
  • Maintains original ASI rate, packet size and coding (energy dispersal scrambling, interleaving or Reed Solomon bytes)

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