scope:

The present document specifies the minimum performance parameters for terrestrial digital fixed service radio communications equipment operating in the 38 GHz frequency band and incorporates, where necessary, changes made in Corrigendum 1 of ETS 300 187/C1 [36] and contains a complete revision in the areas of: - additional systems with higher spectrum efficiency in the new class 4 systems; - introduction of unique system type codes for regulatory reference to the various system types detailed in the present document, refer to new annex C (normative) and related categories of equipment classes of spectral efficiency; - change of spectrum mask and adjacent channel selectivity of STM-0 systems in 28 MHz channel spacing to align to EN 300 639 [33]; - introduction of new spectrum efficiency class 5 for STM-1 capacity for 28 MHz Adjacent Channel Alternate-Polarization (ACAP as class 5a) and Adjacent Channel Co-Polarization (ACCP as class 5b), see examples of the spectrum usage in figures 1.1a and 1.1b: