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MUX and DeMUX data transcoders available from IRT Electronics

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article image MUX and DeMUX data transcoders

MMM-4230 and MMX-4230 4 ASI to G.703 MUX and DeMUX 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 4 ASI to G.703 MUX 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 DeMUX 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 4 ASI to G.703 MUX 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.

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 4 ASI to G.703 MUX 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 of the MMM-4230 & MMX-4230 4 ASI to G.703 MUX & DeMUX

The MMM-4230 and MMX-4230 4 ASI to G.703 MUX and DeMUX 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 45 Mb/s G.703 link
  • Input rate stuffing to 45 Mb/s G.703 rate
  • Selectable input maximum data rates
  • Automatic Input equalisation up to 300m
  • Suitable for Single Frequency Network (SFN) use
  • Optional SNMP plug-in monitoring and control module Eurocard format

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