Schedule 2A, Part 1, paragraph 2(2)

For the purposes of this Schedule, the interpretative notes set out in Table 1 apply. Single Instruction Multiple Data (SIMD) architectures such as vector or array processors; Multiple Single Instruction Multiple Data (MSIMD) architectures; Multiple Instruction Multiple Data (MIMD) architectures, including those that are tightly coupled, closely coupled or loosely coupled; structured arrays of processing elements, including systolic arrays. “data signalling rate” means the rate, as defined in International Telecommunications Union Recommendation 53-36, taking into account that, for non-binary modulation, baud and bit per second are not equal. Bits for coding, checking and synchronization functions are to be included. When determining the “data signalling rate”, servicing and administrative channels shall be excluded. It is the maximum one-way rate, i.e., the maximum rate in either transmission or reception. “spectral efficiency” is a figure of merit parametrized to characterize the efficiency of transmission system that uses complex modulation schemes such as QAM (quadrature amplitude modulation), Trellis coding, QSPK (Q-phased shift key), etc.. It is defined as the Digital transfer rate (bits/second) divided by 6dB spectrum bandwidth (Hz).

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Source: legislation.gov.uk · retrieved 2026-08-30