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IRT Electronics

Adapters - MMM-4680 and MMX-4680 4 ASI to STM-1 from IRT Electronics

By IRT Electronics
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Tel: 02 9439 3744
Fax: 02 9439 7439
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MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter
MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter
MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter
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MMM-4680 and MMX-4680 4 ASI to STM-1 Adapter from IRT Electronics

Data Transcoder Adapters for Video Distribution
The MMM-4680 and MMX-4680 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.
General Advantages of IRT Combiner / Decombiners 
With the MMM-4680 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 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.

Other Adapter Features
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 & 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 transmitter shows if there is an input data rate violation. Corresponding alarm on the MMX 4680 receiver shows a loss of STM-1 input.

The MMM-4680 and MMX-4680 are designed to fit IRT’s standard Eurocard frames and may be used alongside any other of IRT’s analogue or digital Eurocards.
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IRT Electronics
Tel: 02 9439 3744
Fax: 02 9439 7439
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