|
Main / Optical interfaces / PORC-3234-4
| PORC-3234-4 series 4-ch AUDIO and RS-232 data optical receiver |
PORC-3234-4 optical receivers convert an optical signal into electrical, deembed up to four audio channels and one RS-232.
PORC-3234-4 module occupies one slot in the PROLFEX 1U/3U racks so that up to four receivers fit into a 1U rack and up to fifteen into a 3U rack.
PORC -3234-4 optical receiver is designed to pair with a POTM-3214-4 optical transmitter.
The output audio signal may be in any standard, independent from the standard on a transmitting side: an analog, AES or combination of both. The following modifications are available:
Model |
Analog audio channels |
AES/EBU audio channels |
Number of rack slots occupied |
PORC-3234(CW)-4 AA |
4 |
- |
1 |
PORC-3234(CW)-4 AE |
2 |
1 |
1 |
PORC-3234(CW)-4 EE |
- |
2 |
1 |
PORC-3234-4 rear panel:
PORC-3234-4 front panel: controls and indicators.
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
- ASSIGN A, B – channel mapping (assignment of any deembedded audio group to any output stereo pair);
- TON A, B – 1kHz test-tone generator ON/OFF in a selected audio channel;
- GAIN A, B - gain controls in channels A/B
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;
- AUD DET – lit when an input signal contains an embedded audio group(s)
PORC-3234-4 simplified schematics
An input optical signal is applied to the photodiode, converted into electrical form and an audio data is deembedded. Audio level (VU/quasi-peak) bar-graph OSD is available on the PAL monitoring output.
PORC-3234 features the PAL-monitor output with the OSD of the bar-graph audio level meters (quasi-peak and VU).
The 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 band with the 20nm steps (CW ## model index denotes a wavelength).
PORC-3234 is sensitive to any wavelength in the 1100..1650nm band.
PORC-3234-4 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
- 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
- Input
- Optical input
Number of inputs |
1 |
Photodiode type |
InGaAs / InP PIN diode |
Optical sensitivity band |
1100~1650nm |
Optical sensor diameter |
120µm |
Optical connector type |
FC / PC
|
Maximum input optical power |
0 dBm |
Optical dynamic range |
-3...-25 dBm |
- Output
- PAL MON output
Connector type |
BNC |
Amplitude |
1000±20 mV at 75 Ohm |
DAC |
10 bits |
Frequency response |
<3 dB up to 5,5MHz |
- Analog audio output
Connector type |
DB-15 |
Output type |
balanced |
Gain control range |
+/-6 dB |
Dynamic range |
100 dB |
Distortions and noise |
less than 0,006%
|
DAC |
24 bits |
Sampling rate |
48 kHz |
- Digital audio output
Output type
|
transformer balanced |
Connector type |
DB-15 |
Amplitude |
3000 mV at 110 Ohm |
Gain controls |
+/-6 dB |
|
