As with reception of SD-SDI, transmission of the slow 270 Mb/s SD-SDI bit rate is not directly supported by the GTX TX. To transmit the SD-SDI signal, the GTX TX is configured for a line rate of 2.97 Gb/s (one of the 3G-SDI line rates). The UHD-SDI core replicates each bit to be transmitted 11 times so that the data out of the SDI core and into the txdata port of the GTX TX contains 11 consecutive copies of each bit. The resulting signal output by the GTX TX is a valid 270 Mb/s SD-SDI signal.