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Main / Optical interfaces / POTM-3251SFP
| POTM-3251SFP series 4-channel TimeDivisionMultiplexed SDI/ASI optical transmitters |
POTM-3251SFP optical transmitters provide the Time Division Multiplexing of up to four SDI or DVB-ASI electrical streams to transmit over a single optical wavelength signal. The hot-swappable SFP optical module allows for the laser replacement (for example - to change the wavelength) without depowering the POTM-3251 optical transmitter. POTM-3251SFP module occupies one slot in the PROLFEX 1U/3U racks so that up to four transmitters fit into a 1U rack and up to fifteen into a 3U rack.
Features
- up to four electrically multiplexed SDI/ASI streams over single optical fiber
- single optical signal in the WDM/CWDM band
- automatic cable equaliser
- up to eight channels transmitted using two optical MUX in WDM band
- up to sixty four channels transmitted using sixteen optical MUX in CWDM band
- signal loss indication
- fault tolerant transmission - loss of any electrical input signals does not affect the remaining
- hot-swappable SFP module with DDMI capability
Laser wavelengths and POTM-3251SFP modifications:
- POTM-3251SFP – 1310nm FP laser diode
- POTM-3251SFP/1550 – 1550nm FP laser diode
- POTM-3251SFPCW## – CWDM DFB laser, 1270~1610nm with 20nm steps (## denotes a wavelength)
Technical specifications
- Electrical input
| Standard compliance |
SMPTE259M A,B,C,D; DVB/ASI |
| Number of inputs |
4, reclocked |
| Input impedance |
75 Ohm |
| Return loss |
better than 18dB up to 270MHz |
| Connector type |
BNC |
| Cable equalisation |
up to 300m of Belden1694A cable or similar |
- Optical output
| Number of outputs |
1 |
| Connector type |
LC/UPC (SFP module), single-mode fiber |
| Laser wavelengths |
1310±20nm FP laser (1550±20nm DFB laser by request) |
| Laser wavelengths CWDM systems |
1270~1370nm, 1430~1610nm with 20nm, DFB laser |
| Optical power |
0~3dBm |
| Datastream throughput |
1600Mbps |
- monitoring output (electrical)
| Number of outputs |
one |
| standard compliance |
as per input signal |
| Return loss |
better than 18dB at 270MHz |
| signal amplitude |
800mV |
| connector type |
BNC |
| Signal rise/fall time |
700ps |
| signal jitter |
less than 0.2UI |
General description
POTM-3251SFP simplified schematics:
An input SDI or DVB/ASI signals are serialized by means of the TDM (TimeDivision Multiplexing). The serialized data is converted into an optical signal of a single wavelength which is available at the optical output.
POTM-3251SFP rear panel:
Controls and indicators
POTM-3251SFP frontal panel:
The MODE button toggles through all the modes, the UP and DOWN buttons edit them.
- MON - lit when an input channel number is being assigned for monitor output (with the UP/DOWN buttons)
- CHANNEL TEST SEL 1...4 - lit when a channel number is being assigned for test signal insertion
- λ, nm - lit when lasers' wavelength is being shown at the mail display
- TxPw - lit when lasers' output optical power is being shown at the mail display (in dBm)
The indicators:
- LOCK 1...4 – lit if there is a valid SDI or DVB-ASI input signal on a channel
- TEST 1...4 – lit when a test signal is being inserted in a channel
Configuring the POTM-3251SFP transmitter
Test signal selection
Toggling the MODE button select the CHANNEL TEST SEL 1...4 mode. Pressing the UP and DOWN buttons select a test signal or disable it.
- OF – a test signal is OFF
- bR - color bar signal is being inserted
- bL - black field is being inserted
- Lt - white field is being inserted
- Pt - pathological pattern is being inserted
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). |
