The present document specifies the minimum performance parameters for terrestrial digital fixed service radio
communications equipments operating in the 18 GHz frequency band and provides for the following:
- system types codes for regulatory unique reference to the various system types detailed in the present document,
refer to annex B (normative).
Digital systems are intended to be used for point-to-point connections in local and regional networks at data rates of
Synchronous Transport Module.
Digital systems considered in the present document will be able to meet the performance objectives of the
ITU-R national portion of the reference path, i.e. ITU-R Recommendation F.1189-1 [23] and the performance
objectives detailed in ITU-T Recommendation G.826 [30] and in ITU-T Recommendation G.828 [31].
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; or
- to separate polarizations of the same antenna.
b) parameters defining the transmission quality of the proposed system.
The present document deals with Radio Frequency (RF) and baseband characteristics relevant to Sub STM-0
Synchronous Digital Hierarchy (SDH) transmission systems. Antenna/feeder system requirements are covered in
EN 300 833 [13].
These digital systems capacities shall be in accordance with ITU-T Recommendation G.708 [27].
The present document does not contain aspects related to test procedures and test conditions, however they are to be
found in EN 301 126-1 [14].
As the maximum transmission rate in a given bandwidth depends on system spectral efficiency, different equipment
classes are defined:
Class 1: equipment spectral efficiency based on typically 16 or 32-states modulation scheme
(e.g. 16-QAM, 32-QAM, or equivalent);
Class 2: equipment spectral efficiency (...abbreviated)