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Main / Optical interfaces / PORC-3235(CW)-4
| PORC-3235-4 audio optical receivers with bidirectional RS-232/RS-422 data support |
PORC-3235-4 optical receivers convert an optical signal into electrical, deembed up to four audio channels and support one bidirectional RS-232/RS-422. PORC-3235-4 module occupies two slots in the PROLFEX 1U/3U racks. PORC-3235-4 are intended to pair with the POTM-3215-4 optical transmitters. The following modifications are available:
Model |
Analog audio channels |
AES/EBU audio channels |
Rack slots occupied |
| PORC-3235-4AA |
4 |
- |
2 |
| PORC-3235-4AE |
2 |
1 |
2 |
| PORC-3235-4EE |
- |
2 |
2 |
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-3235 features the PAL-monitor output with the OSD of the bar-graph audio level meters (quasi-peak and VU). RS-232/RS-422 data transmission speed – up to 150 kBit/s. PORC-3235 receiver and it's intended counterpart - POTM-3215 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-3235 is sensitive to any wavelength in the 1100..1650nm band.
According to one's application needs, the following transmitter/receiver combinations are advised for unidirectional transmission of audio/video and bidirectional RS-232/RS-422 data communication:
Model |
number of optical fibers |
TX power |
RX sensitivity |
Note |
POTM-3215-4AA/AE/EE
PORC-3235-4AA/AE/EE |
1 |
-3dBm |
-19dBm |
RX 1310nm, TX 1550nm, WDM |
POTM-3215D-4AA/AE/EE
PORC-3235D-4AA/AE/EE |
2 |
-3dBm |
-25dBm |
RX and TX 1310nm |
POTM-3215DCW##--4AA/AE/EE
PORC-3235DCW##--4AA/AE/EE |
2 |
0dBm |
-25dBm |
any CWDM wavelength (RX and TX wavelengths are different) with an external optical MUX/DEMUX |
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/RS-422 data up to 150 kbps
- WDM/CWDM optical systems compatibility
- 24-bit audio DAC
- output audio standard independent from a standard at a transmitting side
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 range |
-25/-19~-3dBm |
- Outputs
- PAL monitor output
| Connector type |
BNC |
| Amplitude |
1000±20mV at 75 Ohm |
| DAC |
10 bits |
| Frequency response |
<3dB up to 5.5MHz |
- Analog audio output
| Connector |
DB-15 |
| Output impedance |
<50 Ohm |
| Output type |
balanced |
| Gain controls |
±6dB |
| 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 |
DB-15 |
| Amplitude |
3V at 110 Ohm |
| Gain controls |
±6dB |
- Data I/O
| Connector type |
DB-9 (female) |
| Standard |
RS-232 or RS-422 user-selectable |
| Data speed |
up to 150kbps |
General description
PORC-3235-4 simplified schematics
PORC-3234 features the PAL-monitor output with the OSD of the bar-graph audio level meters (quasi-peak and VU).
PORC-3235-4 single-fiber and dual-fiber modifications rear panels:
Controls and indicators
PORC3235-4 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/DATA – to select an audio group number for deembedding or data embedding
- VU METR – an audio bar-graph OSD placement and scale controls
- ASSIGN A , B – audio channel mapping
- TON A/B – 1kHz test-tone generator ON/OFF in a selected audio channel
- GAIN A/B - 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
- AUD DET – lit when an input signal contains valid audio streams
- 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). |
