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Fibre Optic Audio Multiplexer System Interface Unit

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Offering a wide range of Fibre Optic Audio Multiplexer System Interface Unit. These are made from high quality raw material. The aim of the configuration is to interface 2 wire high signal low impedance termination for a 4 wire conversion, and vice versa. The unit feeds 2 wire audio to the 8 channel communication network wired with copper cable medium.


  • Outstanding quality
  • Smooth functioning
  • Easy operations


  • An LED blinker indicates the activity of 4 Wire Tx and Rx port upon selection available.
  • An LED glows when 4 Wire Rx (hybrid) leakage exceeds a set value of 100mvpp.
  • Probe monitoring provision for 4 Wire Rx level is available on the front panel. The interface chassis has one module / channel totaling 8 modules supporting 8 channels. I/P & O/P connections are made through BNC connectors.

4 Wire Tx:

  • Variable audio signal (2 – 16 Vpp level) is fed to the hybrid circuit of 2 wire voice line of impedance 100 - 300Ω
  • Half the level of the input signal is obtained at the 4 wire Tx terminals of the hybrid network. This goes through an amplifier stage and an AGC circuit
  • The AGC output is fed to a mute logic circuit to mute the 4 wire receiver amplifier input so that the leakage of the transmitter output into the receiver circuit is kept to the minimum.

4 Wire Rx:

  • The output of the fibre optic converter is fed to the 4 wire Rx terminals through a coupling transformer.
  • The output of the transformer is fed to the buffer stage and then to an amplifier stage.
  • The output of the amplifier stage is fed to a coupling transformer to the 4 wire Rx of the hybrid network.
  • Additionally the buffered output of 4 Wire Rx is fed to the AGC circuit and the output of AGC circuit is fed to the comparator and this output is used for muting of 4 Wire Tx output when it is present.


  • Number of channels to support: 8 (with required slot provision),
  • Dual Power supply with: 230VAC 10%, 50 Hz input fed from main 1 and main 2.
  • No. of wire input: 4
  • Impedance: 100 - 300Ω


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