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Main / Optical interfaces / PORC-3227
| PORC-3227 series SDIembedded optical receiver with synchronization |
PORC-3227 optical receivers convert an optical signal into electrical, suport SDIembedded synchronization to the REF. The PORC-3227RS modification deembeds the RS-232. PORC-3227 module occupies one slot in the PROLFEX 1U/3U racks.
Features
- signal loss indication
- embedded audio present indication
- SDI synchronization to the REF (black burst)
- built-in 1kHz test-tone generator
- audio group selection for embedding and deembedding
- audio gain controls ±6dB with 0.2dB steps
- audio delay follows video
- adjustable (±32 frames) audio delay
- EDH (min/hour) indication
- PAL MON video output with the bar-graph audio level meters (quasi-peak and VU) OSD
- 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 |
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-3227 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. The monitor output provides the PAL picture with the audio level meter OSD.
PORC-3227 rear panel:
Controls and indicators
PORC-3227 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
PORC-3227 modifications:
PORC-3227RS - with unidirectional RS-232 data support.
Data deembedding and RS-232 line driving, up to 150kbps.
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). |
