The present document specifies parameters for high capacity STM-1 digital radio-relay systems designed to operate in
the 17,7 GHz to 19,7 GHz band. The channel spacing between adjacent co-polar channels shall be 55 MHz or
27,5 MHz. Operation in the Adjacent Channel Co-Polarization (ACCP) mode for class 4 systems and class 5 systems as
defined below with orthogonal polarizations or in the alternated cross-polar mode is foreseen. Additionally for class
4 systems, operation in the Co-Channel Dual Polarized (CCDP) mode with orthogonal polarization is also foreseen. The
present document covers both single and multi-channel systems.
The present document specifies the minimum performance parameters for terrestrial fixed service radio
communications equipment operating in the frequency range 17,7 GHz to 19,7 GHz and contains a revision from the
previous version, in the area of:
- categorization of previously considered equipments into a new spectrum efficiency class 4;
- 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;
- new spectrum efficiency class 5 for STM-1 capacity for 27,5 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:
Figure 1
- technical specifications relevant to the EMC Directive [30], detailed in annex B.
The applications of these digital radio-relay systems are anticipated to be in the regional and access networks, at data
rates of 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 antennas; (...abbreviated)