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Main / Optical interfaces / PORC-3234-8/16

PORC-3234-8/16 optical receivers convert an optical signal into electrical, deembed up to eight or sixteen audio channels and one RS-232. PORC-3234-8 module occupies one slot in the PROLFEX 1U/3U racks, PORC-3234-16 occupies two slots. PORC-3234-8/16 are intended to pair with the POTM-3214-8/16 optical transmitters. The following modifications are available:

The output audio signal may be in any standard, independent from the standard on a transmitting side: an analog, AES or combination of both. PORC-3234 features the PAL-monitor output with the OSD of the bar-graph audio level meters (quasi-peak and VU). RS-232 data transmission speed – up to 150 kBit/s. PORC-3234 receiver and it's intended counterpart - POTM-3214 transmitter support the single-, dual- and multi-signal optical systems. The transmitter's laser wavelengths are:

• single-signal system: 1310±20nm or 1550±20nm by request
• WDM system: 1310±20nm and 1550±20nm
• CWDM system: any in the 1270~1610nm with 20nm (CW## model index denotes a wavelength)

PORC-3234 is sensitive to any wavelength in the 1100..1650nm band.

PORC-3234 features:

• signal loss indication
• embedded audio present indication
• built-in 1kHz test-tone generator
• audio group selection for deembedding
• indepemdent gain controls for all audio pairs with 0.2dB steps
• audio channel mapping
• output audio format is independent from the input on a transmitting side
• EDH (min/hour) indication
• PAL MON video output with the bar-graph audio level meters (quasi-peak and VU) OSD
• RS-232 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 photodiode
    Optical sensitivity band	1100~1650nm
    Optical sensor diameter	120µm
    Optical connector type	FC/PC
    Maximum input optical power	-3dB
    Optical dynamic range	-25~ -3dB

• Outputs
  • Analog audio output
    

    Connector type	DHS-26F
    Output impedance	less than 50 Ohm
    Output type	balanced
    Gain controls	+/-6dB with 0.2dB steps
    Dynamic range	100dB
    Distortions and noise	less than 0.006%
    DAC	24 bits
    Sampling rate	48kHz

  • Digital audio output
    

    Output type	transformer balanced
    Connector type	DHS-26F
    Amplitude	3V at 110 Ohm
    Gain controls	+/-6dB with 0.2dB steps

  • PAL monitor output with the audio level meter OSD
    

    Connector type	BNC
    Amplitude	1000±20mV at 75 Ohm
    DAC	10 bits
    Frequency response	<3dB up to 5.5MHz

PORC-3234-8 simplified schematic diagram:

PORC-3234-8 rear panel:

The sixteen-channels modification, PORC-3234-16, is the couple of PORC-3234-8 internally cascaded one after another. The first module in the pair provides the optical input deembedding the audio channels 1~8, the second module deembeds audio channels 9~16.

PORC-3234-16 simplified schematics:

PORC-3234-16 rear panel:

 Controls and indicators

All the controls and indicators are located on the frontal side of a module.

PORC-3234-8 frontal panel:

PORC-3234-16 frontal panel:

The operation mode is selected by toggling the MODE button, the editing is done by pressing the UP and DOWN buttons.

The editable modes are:

• GROUP SEL – to select an audio group number for deembedding
• VU METR – an audio bar-graph OSD placement and scale controls
• TON – 1kHz test-tone generator ON/OFF in a selected audio channel
• GAIN 01, 02, 03, 04 (05, 06, 07 08) - gain controls in a selected channel

The indicators:

• LOSS – lit if there is no input signal
• EDH DET – lit when an input signal contains valid EDH packets
• EDH MIN/HOUR – lit if an EDH error was detected whithin the last minute/hour interval

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).