IRT-6642-DTR:   Dual 12G/6G/3G/HD/SD-SDI/ASI Fibre Optic Transceiver



User Manual  

Transports 12G-SDI, 6G-SDI, 3G-SDI, HD SDI, SD-SDI or ASI signal rates.
Suitable for 4K/UHD video.
Dual Single or dual bi-directional operation possible with independent transmit and receive functions on the one card.
Path lengths up to 16 dB1 optical path loss using 9/125 µm single mode fibre.
DashBoard™ software monitoring and control.


With the advent of 4K/UHD television, distribution of higher data rate video signals up to 11.88 Gb/s (12G-SDI) has become necessary which can't always be achieved via coaxial cable.

The IRT-6642-DTR is a dual transmit/receive (transceiver) module designed principally for use as a serial data fibre optic transmission link for 12G-SDI, 6G-SDI, 3G-SDI, HD-SDI or SD-SDI applications conforming to SMPTE standards 2082-1, 2081-1, 424M, 292M and 259M-C 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 IRT-6642-DTR can be used as independent transmitters and receivers at the same time allowing dual bi directional operation over a single mode fibre. Transmit and receive functions are combined via a CWDM optical combiner2.

Being independent from each other, the transmit and receive signals can be of mixed signal types.

The receivers use PIN detectors with a signal conditioning and reclocking circuit. The data rates is automatically set to match the 12G-SDI, 6G-SDI, 3G-SDI, HD-SDI or SD SDI/ASI rates dependent on the actual input data rates to the transmitters.

The IRT-6642-DTR is designed to fit the openGear® standard 2RU frames which allow a mixture of cards from various manufacturers to be mounted within the same frame.

Remote monitoring is possible via openGear's DashBoard™ control software, which is available as a free download.

16 dB path loss at HD/SD, 15 dB at 3G and 12 dB at 12G/6G. Fitted with PIN detector.
When operating as a pair, one IRT-6642-DTR must be fitted with a 1510nm/1550nm transceiver pair and the other with a 1530nm/1570nm transceiver pair.


Input serial data signal
11.88 Gb/s (12G-SDI) to SMPTE 2082-1;
5.94 Gb/s (6G-SDI) to SMPTE 2081-1;
2.97 Gb/s (3G-SDI) to SMPTE 424M;
1.485 Gb/s (HD-SDI) to SMPTE 292M;
270 Mb/s (SD-SDI) to SMPTE 259M-C and DVB-ASI.
Input Impedance
75 Ω.
Input Return Loss
> 15 dB 5 MHz to 1.5 GHz;
> 10 dB 1.5 GHz to 2.97 GHz.
Automatic Cable Compensation
> 50m at 11.88 Gb/s (12G-SDI) with RG6/U;
> 100m at 5.94 Gb/s (6G-SDI) with RG6/U;
> 150 m at 2.97 Gb/s (3G-SDI) with Belden 1694A;
> 150 m at 1.485 Gb/s (HD-SDI) with Belden 1694A;
> 300 m at 270 Mb/s (SD-SDI/ASI) with Belden 8281.
Input Connector
2 x BNC on rear assembly.

Number of Outputs
2 data reclocked, AC coupled.
Output Level
800 mV ± 10%.
Output Impedance
75 Ω.
Output Return Loss
> 15 dB 5 MHz to 1.5 GHz;
> 10 dB 1.5 GHz to 2.97 GHz.
Output Rise and Fall Time
< 135 ps at 2.97 Gb/s and 1.485 Gb/s;
> 0.4 ns and < 1.5 ns at 270 Mb/s.
Intrinsic Jitter
< 0.3 UI at 2.97 Gb/s reclocked;
< 0.2 UI at 1.485 Gb/s reclocked;
< 0.1 UI at 270 Mb/s reclocked.
Output Connector
2 x BNC on rear assembly.

Optical Output
2 x 0 dBm +5/-0 dB CWDM DFB lasers, optically combined.
Optical Input
PIN detectors, (0 dBm to) -12 dBm at 12G/6G-SDI,
-15 dBm at 3G-SDI and -16 dBm at HD/SD-SDI.
Available Wavelengths
CWDM DFB transceiver pairs - 1510nm/1550nm & 1530nm/1570nm (standard).
Optical Path Loss
0 to 12 dB at 12G/6G-SDI, 15 dB at 3G-SDI and 16 dB at HD/SD-SDI.
(Optical path loss = Laser O/P power - Detector I/P power)
Optical Fibre
Designed for use with 9/125 µm single mode fibre.
Optical Connector
1 x SC/PC (standard) on rear - direct connection to main card.
(Optical outputs and optical inputs combined via on-board CWDM).

Power Requirements:
+ 12 Vdc.
Power consumption
< 5VA.

Temperature range
0 - 50°C ambient.
Suitable for mounting in an openGear® 2RU rack chassis.
Dimensions (openGear® standard)
33.6 mm x 2U x 325 mm.

Supplied accessories
Rear connector assembly.

IRT-6642-DTR fitted with 1510nm/PIN & 1550nm/PIN transceiver pairs, programmed with DashBoard™ control.
IRT-6642-DTR fitted with 1530nm/PIN & 1570nm/PIN transceiver pairs, programmed with DashBoard™ control.


Due to our policy of continuing development, these specifications are subject to change without notice.