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IRT-6630-DTR: 3G/HD/SD-SDI/ASI Fibre Optic Transceiver

IRT-6630-DTR Home Page, PDF Brochure

The IRT-6630-DTR is a 3G/HD/SD-SDI/ASI optical fibre transceiver with either separate transmit and receive fibre ports, or fitted with an optional WDM fibre mux for combined use on a common single mode fibre.


  • Transports 3G-SDI, HD-SDI, SD-SDI or ASI signal rates.
  • Single or bi-directional operation possible with independent transmit and receive functions on the one card.
  • Path lengths up to 30 dB1 optical path loss using 9/125μm single mode fibre.
  • Automatic changeover switching of input for signal redundancy on Tx.
  • Optional on-board WDM2,3 optical combiner for use on a single common fibre.
  • DashBoard software monitoring and control.

IRT-6630-DDT Block Diagram

The IRT-6630-DTR is a transmit/receive (transceiver) module 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-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 transmitter section features automatic input cable equalisation. A “keep link alive” signal is available to maintain optical link operation when no electrical input is present.

Two inputs are provided with automatic changeover to input 2 on loss of input 1 for input signal redundancy.

The receiver section uses an APD detector with signal conditioning and reclocking circuits. The data rate is automatically set to match the 3G-SDI, HD-SDI or SD-SDI/ASI rates dependent on the actual input data rate to the transmitter.

The IRT-6630-DTR can be used as an independent transmitter and receiver at the same time allowing bi directional operation over two single mode fibres. Being independent from each other, the transmit and receive signals can be of mixed signal types.

Optionally a 1310/1550nm WDM2,3 optical combiner can be fitted to allow for combined use on a single fibre.

The IRT-6630-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.

The DashBoard control software is available as a free download.

NOTE: 1 – 27dB path loss at 3G. Typically >30dB at HD and SD. Fitted with APD detector.
NOTE: 2 – With WDM option fitted for combined use on a single fibre, optical path loss is reduced by approximately 2dB.
NOTE: 3 – With WDM option fitted, when operating as a pair, one IRT-6630-DTR must be fitted with a 1310nm laser and the other a 1550nm laser.

Product by:

IRT Communications IRT specialises in the design, development and manufacture of Digital and Analogue Video / Audio Broadcast and communications products including MPEG, ASI, DVB, AES/EBU, G.703, Distribution Amplifiers (DAs), HDTV and Fibre (Fiber) Optic devices used in telecommunication (ITU) and broadcast centres. Visit irtcommunications.com…