The present document specifies the minimum performance parameters for terrestrial fixed service radio
communications equipments operating in the frequency range 24,50 GHz to 29,50 GHz and contains a revision from the
previous version, in the areas of:
- introduction of unique system type codes for regulatory reference to the various system types detailed in the
present document, refer to new annex C and related categories of equipment classes of spectral efficiency;
- additional systems with higher spectrum efficiency in the new class 4 systems;
- change of spectrum mask and adjacent channel selectivity of STM-0 systems in 28 MHz channel spacing to align
to EN 300 639 [34];
- 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;
- change to spectrum mask for class 4 (140 Mbit/s to 155 Mbit/s) at "f5" to align with the mask used in the
23 GHz and 38 GHz standards.
NOTE: In a previous version (ETS 300 431 [37]), there was provision for:
- further options for Grade A digital radio systems (with 112 MHz channel separation);
- specific antenna radiation patterns (now superseded by EN 300 833 [3]).
These options are not reprinted in the present document as they are considered to be no longer of interest for ETSI
members. However, for regulatory purposes, they may still be referenced from ETS 300 431 [37].
Digital systems are intended to be used for point-to-point connections in local and regional networks at data rates
between 2 Mbit/s and the Synchronous Transport Module, level 1 (STM-1).
The parameters to be specified fall into two categories:
a) those that are required to provide compatibility between channels from different sources of equipment on the
same route, connected either:
- to separate ante (...abbreviated)