The IRT DDT-4624 and DDR-4624 are transmit and receive modules designed principally for use as a serial data fibre optic transmission link for 3G-SDI, HD-SDI or SD-SDI applications conforming to SMPTE standards 424M, 292M and 259M using 9/125 μm single mode fibre. They are available from IRT Electronics .
This enables the use of space saving fibre optic cable for reliable transmission of digital video signals over lengths greater than can be achieved with coaxial cable. The transmit / receive system specifications apply to all signal conditions, including SMPTE pathological test sequences.
In addition, the link may be used for ASI transport streams for use with MPEG compressed video streams or other 270 Mb/s type data. The transmitter features automatic input cable equalisation. The unit can be configured with lasers of various wavelengths. LED indicators are provided for digital signal presence, DC power and LASER output power out of range.
The DDR-4620 receiver uses a choice of either a PIN photodiode or APD detector with signal conditioning and reclocking circuits. The data rate is automatically set to match the 3G-SDI, HD-SDI or SD-SDI rates dependent on the actual input data rate to the transmitter.
Features of DDT-4624 and DDR-4624 transmit and receive modules:
- One type covers 2.97 Gb/s 3G-SDI, 1.485 Gb/s HD-SDI or 270 Mb/s SD-SDI & ASI signals
- LED indicators and external alarm contacts
- Passes SMPTE 424M/292M/259M 3G/HD/SD-SDI pathological test sequence
- Fibre, video and alarm connections at rear
- SNMP monitoring
- Path lengths up to 27 dB optical path loss using 9/125μm single mode fibre