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Main / Optical interfaces / PORC-3231

PORC-3231 series SDIembedded optical receiver with synchronization, auxiliary audio output and bidirectional RS-232/RS-422 support

PORC-3231 optical receivers convert an optical signal into electrical, support SDIembedded synchronization to the REF, auxiliary audio output. PORC-3231 supports the bidirectional RS-232/RS-422 communication over an optical link. PORC-3231 module occupies two slots in the PROLFEX 1U/3U racks.

Model
Analog audio outputs
AES/EBU audio outputs
Rack slots occupied
PORC-3231AA
4
-
2
PORC-3231AE
2
1
2
PORC-3231EE
-
2
2

Features

  • signal loss indication
  • embedded audio present indication
  • SDI synchronization to the REF (black burst)
  • built-in 1kHz test-tone generator
  • up to four audio channels deemdebbable
  • audio group selection for embedding and deembedding
  • audio gain controls ±6dB with 0.2dB steps
  • audio delay follows video
  • adjustable (±32 frames) audio delay
  • analog or AES/EBU audio output
  • EDH (min/hour) indication
  • PAL MON video output with the bar-graph audio level meters (quasi-peak and VU) OSD
  • bidirectional RS-232/RS-422 data up to 150 kbps
  • WDM/CWDM optical systems compatibility
  • 24-bit audio DAC

Technical specifications

  • Inputs
    • Optical input
      Number of inputs 1
      Photodiode InGaAs/InP PIN diode
      Optical sensitivity band 1100~1650nm
      Optical sensor diameter 120µm
      Optical connector type FC/PC
      Maximum input optical power 0dBm
      Optical dynamic band -25 ~ -3dBm
    • REF video input
      Input AC-coupled
      Connector type BNC
      Composite SYNC amplitude 300±100mV
      Input impedance >10kOhm
  • Outputs
    • SDI video output
      Number of outputs 3, with reclocking
      Compatibility ITU-R BT.656 (embedded audio)
      Connector type , output impedance BNC, 75 Ohm
      Return loss better than 18dB at Ft
      Amplitude 800mV±10%
      Audio gain controls ±6dB with 0.1dB steps
    • PAL monitor output
      Connector type BNC
      Amplitude 1000±20mV at 75 Ohm
      DAC 10 bits
      Frequency response <3dB up to 5.5MHz
    • Analog audio outputs
      Connector type DB-15 female
      Output impedance <50 Ohm
      Output type balanced
      0dB FS output headroom +18dB
      Dynamic range 100dB
      Distortions and noise less than 0.006%
      DAC 24 bits
      Sampling rate 48kHz
      Gain controls ±6dB with 0.1dB steps
    • AES/EBU audio outputs
      Connector type DB-15 female
      Output type transformer balanced
      Amplitude 3V at 110 Ohm
      Gain controls ±6dB with 0.1dB steps
    • Optical output (RS-232/RS-422 data return channel)
      Optical system (model index)
      WDM (PORC-3231)
      PORC-3231D
      CWDM (PORC-3231DCW##)
      Laser diode type FP FP DFB
      Laser wavelength RX 1310±20nm, TX 1550±20nm 1310±20nm (1550±20nm by request) 1270~1610nm in 20nm steps
      Optical output power -3dBm -3dBm 0dBm
      Optical connector type FC/PC FC/PC FC/PC
      Number of optical fibers 1 2 2
    • RS-232/RS-422 data input/output
      Connector type DB-15
      Standard compliance RS-232
      Data rate up to 150 kbps

Frame/Line synchronization of SDI to REF:

  • ±127 TV lines advance/delay within one TV frame
  • ±32µs advance/delay within one TV line with 37ns steps

PORC-3231 general description

Simplified schematics

Optical signal is amplified and demodulated. The resulting SDI is decoded into the 10-bits 4:2:2 stream which is processed to recover video and audio. Video stream is buffered and synchronized to the REF signal. The deembedded audio is buffered and a user-controllable delay is applied. The resulting audio stream is reembedded into an output SDI, also an analog or digital format is available at an audio output. RS-232/RS-422 data is deembedded from an input optical signal, the return RS-232/RS-422 channel is embedded into the output optical signal. The monitor video output provides the PAL picture with the audio level meter OSD.

PORC-3231 rear panel:

Controls and indicators

PORC-3231 frontal panel:

The operation mode is selected by toggling the MODE button, the editing is done by pressing the UP and DOWN buttons. Pressing the UP and DOWN buttons simultaneously resets a parameter to a default value. The FREEZE button controls the "frame freeze" function.

The editable modes are:

  • INP GROUP SEL – to select an audio group number for deembedding
  • OUT GROUP SEL - to select an audio group number for reembedding
  • VU METR – an audio bar-graph OSD placement and scale controls
  • TON – 1kHz test-tone generator ON/OFF in a selected audio channel
  • GAIN 1/2 - gain controls in the first stereo pair
  • GAIN 3/4 - gain controls in the second stereo pair
  • TIMING H - SDI to REF synchronization within a TV line
  • TIMING V - SDI to REF synchronization within a TV frame
  • TIMING AUD DELAY - audio delay in TV line increments
  • FREEZE - the "frame freeze" mode ON/OFF

The indicators:

  • REF – lit if there is a valid REF video signal
  • INP - lit if there is a valid input video signal
  • AUD DET – lit when an input signal contains valid audio packets
  • EDH MIN/HOUR – lit if an EDH error was detected whithin the last minute/hour interval
  • ADVANCE - displays the current value of delay/advance of SDI signal relative to the REF

The remote control and management from a PC

All the “PROFLEX” modules are remote controllable from a PC. This facility is available if a rack is fitted with a CPU module (ordered separately).


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