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Main / Optical interfaces / POTM-3215-4
| POTM-3215-4 series optical 4-ch AUDIO transmitters and RS-232/RS-422 data transceivers |
PROFLEX™ POTM-3215 optical transmitters accept up to four audio channels with an independent gain controls and one RS-232 bidirectional data signal to send over the single-mode optical fiber.
The POTM-3215 module occupies two slots in the PROLFEX 1U/3U racks so that up to two transmitters fit into a 1U rack and up to eight into a 3U rack.
A POTM-3215 transmitter is intended to pair with PORC-3235 series receivers which are WDM/CWDM/single-signal compatible.
Available modifications:
Model |
No. of analog AUDIO channels |
No. of AES/EBU channels |
rack slots occupied |
| POTM-3215-4 AA |
4 |
- |
2 |
| POTM-3215-4 AE |
2 |
1 |
2 |
| POTM-3215-4 EE |
- |
2 |
2 |
The POTM-3215 accepts an analog and/or AES/EBU audio signal in any combination of inputs. At a receiving side the output standard may be chosen arbitrarily.
According to one's application demands the following combinations are sugested:
Model |
No. of fibers |
TX optical power |
RX sensitivity |
Notes |
POTM-3215-4 AA/AE/EE
PORC-3235-4 AA/AE/EE |
1 |
-3dBm |
-19dBm |
|
POTM-3215D-4 AA/AE/EE
PORC-3235D-4 AA/AE/EE |
2 |
-3dBm |
-25dBm |
|
POTM-3215DCW##-4 AA/AE/EE
PORC-3235DCW##-4 AA/AE/EE |
2 |
0dBm |
-25dBm |
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POTM-3215 optical transmitter (and PORC-3235 optical receiver) is featuring the PAL monitor output: the black-burst with the bargraph audio level (quasi-peak and VU) meters OSD.
POTM-3215-4 features:
- an SRC on every AES/EBU input
- independent gain controls on all channels (analog and digital)
- a built-in 1kHz tone generator
- a group select for audio embedding
- a bargraph audio level meter OSD at the PAL-monitor output
- RS-232/RS-422 data transmission support (up to 150 kbps)
- CWDM/WDM/single-signal optical systems compatibility
- any combination of standards on audio inputs
- 24-bits audio ADC
POTM-3215-4 simplified schematic diagram:
Technical specifications
- Input
- Analog audio input
| Input type |
balanced |
| Input impedance |
> 10kOhm |
| Connector type |
DB -15 |
| 0dB Fs input signal level |
+18dB (+24dB jumper setting) |
| Dynamic range |
> 100dB |
| Harmonic distortion + noise |
< 0,006% |
| Sampling |
24bits/48kHz (20 MSB embedded) |
| Gain control |
±6dB |
- AES/EBU input
| Input type |
transformer-balanced |
| Connector type |
DB -15 |
| Amplitude |
0,2~4,0V |
| Input impedance |
110 Ohm |
| Maximum input cable length |
up to 100m of twisted pair |
| Gain control |
±6dB |
| Input sampling rate |
32..48kHz |
| Output sampling rate |
48kHz (SRC on every AES/EBU input) |
- Optical input
Number of inputs |
one |
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 |
- Data input/output
| Connector |
DB -9F |
| Standard |
user-selectable RS-232/RS-422 |
| Max bitrate |
up to 150kbps |
- Output
- Optical output
| System |
Single-signal |
WDM |
CWDM |
Laser diode type |
FP |
FP |
DFB |
Wavelength |
1310±20nm (1550±20nm by request) |
1310±20nm and 1550±20nm |
1270~1370nm, 1430~1610nm with 20nm steps
|
Output optical power |
–3dBm |
–3dBm |
0dBm |
Optical connector type |
FC/PC |
FC/PC |
FC/PC |
- PAL monitor output with audio level bargraph OSD
| Connector type |
BNC |
| Amplitude |
1000±20mV/75Ohm |
| DAC |
10bits |
| Frequency response |
<3dB at 5,5MHz |
Controls and indicators
POTM-3215-4 frontal panel:
The operation mode is selected from a list by toggling by the MODE button, the UP and DOWN buttons change the settings of the selected mode.
Modes of operation:
- GROUP – an audio group selection for the embedding
- TON – the 1kHz test-tone ON/OFF
- VU METR – the VU-meter type, it's OSD position, enable/disable
- GAIN – an audio gain controls for each channel or stereo pair
- LOSS AES 1, AES 2 – AES-loss indication (AE and EE modifications only)
POTM-3215-4 rear panel:
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