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The APCM-404A is used to encode data in an IRIG-106 Chapter 4 (Ch.4) PCM stream.

Parameters from any ADAU module in the chassis can be placed in the Ch.4 PCM stream. Parameters from other system chassis or Ethernet sources can also be placed in the Ch.4 PCM stream.

Ethernet frames are input to the ADAU chassis via the controller and passed to the APCM-404A across the backplane.

Multiple APCM-404A modules can be included in an ADAU system and parameters can be sent to some or all encoders. The APCM-404A has differential-ended RS-422 outputs for data and clock along with buffered TTL outputs for NRZ-L, DATA, DCLK, word, minor-frame and major-frame pulses.

The APCM-404A also has a programmable premodulation filtered analog output, which is suitable for use with a linear FM transmitter for telemetry. The cut-off frequency and amplitude can be changed to suit the bit-rate and transmitters deviation sensitivity.

All physical outputs transmit the same payload data using independent line encoding (PCM codes) configurations.

Key Features

  • IRIG-106 Chapter 4 PCM
  • Dual RS-422 outputs up to 40 Mbps; 10 PCM codes; separate PCM codes per output
  • NRZL TTL output up to 16 Mbps
  • PMF output up to 8 Mbps
  • PCM encoding of any system parameter without the need for separate Ethernet bus monitor


  • RF transmission of PCM IRIG-106 Ch.4 streams
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