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Main / Optical interfaces / PORC-3229
| PORC-3229 AA/AE/EE series SDIembedded optical receiver with synchronization, external audio and RS-232 support |
PORC-3229 optical receivers convert an optical signal into electrical, support SDIembedded synchronization to the REF. PORC-3229 module occupies two slots in the PROLFEX 1U/3U racks. The following modifications are available:
Model |
Analog audio channels |
AES/EBU audio channels |
Rack slots occupied |
| PORC-3229AA |
4 |
- |
2 |
| PORC-3229AE |
2 |
1 |
2 |
| PORC-3229EE |
- |
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
- up to four external audio channels embeddable
- 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
- RS-232 data up to 150 kbps
- WDM/CWDM optical systems compatibility
- 24-bit audio ADC
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 |
- Analog audio inputs
| Connector type |
DB-15 |
| Input impedance |
>10 kOhm |
| Input type |
balanced |
| 0dB FS input headroom |
+18dB |
| Dynamic range |
100dB |
| Distortions and noise |
less than 0.006% |
| ADC |
24 bits , 20 MSB embeddable |
| Sampling rate |
48kHz |
| Gain controls |
±6dB with 0.1dB steps |
- AES/EBU audio inputs
| Connector type |
DB-15 |
| Input type |
transformer balanced |
| Amplitude and input impedance |
0.2~4V, 110 Ohm |
| Input cable maximum length |
up to 100 meters of twisted pair |
- 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 |
- RS-232 data 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-3229 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. Optionally, an external audio may be embedded. The monitor video output provides the PAL picture with the audio level meter OSD.
PORC-3229 rear panel:
Controls and indicators
PORC-3229 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). |
