This standard is called a 3 Gb/s interface, but the actual bit rates are 2.97 Gb/s and 2.97/1.001 Gb/s. The SMPTE UHD-SDI core fully supports both of these bit rates. 3G-SDI supports several different mapping levels, described in the SMPTE ST 425-1 standard. These levels are called A, B-DL, and B-DS. The SMPTE UHD-SDI core supports all three of these levels. As with the HD-SDI standard, the SMPTE UHD-SDI core supports CRC generation and checking and line number insertion and capture for 3G-SDI.