Available from IRT Electronics , the IRT DDT-4620 and DDR-4620 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. 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.
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 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.
Two serial digital outputs are provided. LED indicators are provided for digital signal presence, signal type, optical loss and power.
Relay contact outputs are also provided for external use of alarm signals on both modules.
An optional SNMP (Simple Network Management Protocol) plug-in module is available, for each unit, for remote monitoring when used in conjunction with an IRT frame fitted with SNMP capability.
Both the DDT-4620 and DDR-4620 are Eurocard modules designed to fit IRT’s current range of 1RU 1000 series and 3RU 4000 series Eurocard frames.
- One type covers 2.97 Gb/s 3G-SDI, 1.485 Gb/s HD-SDI or 270 Mb/s SD-SDI & ASI signals
- Path lengths up to 27 dB optical path loss using 9/125μm single mode fibre
- LED indicators and external alarm contacts
- Fibre, video and alarm connections at rear
- Optional plug-in SNMP monitoring module