The present document specifies the minimum performance parameters for terrestrial fixed services
radiocommunications equipment, as given below, for operation in the 13 GHz (12,75 GHz to 13,25 GHz), 15 GHz
(14,5 GHz to 15,35 GHz) and 18 GHz (17,7 GHz to 19,7 GHz) frequency bands.
The present document covers equipment for the transmission of sub-STM-1 digital signals with a VC3 payload
capacity. The standardization of sub-STM-1 radio systems for 13 GHz, 15 GHz and 18 GHz bands has been prepared to
ensure the compatibility with the existing plesiochronous and the new synchronous systems concerning frequency plans
and performance.
The application of these digital radio-relay systems is anticipated to be for point-to-point links in local, regional and
national networks, mobile base station connections, customer and access links. Consideration has to be given to special
requirements of the local and access network, e.g. simple towers with less space for antenna, different network
structures with high density nodes.
The systems considered shall operate in these networks having regard for existing hop lengths, which mainly depend on
the frequency band envisaged, the performance objectives set by relevant ITU-R Recommendations or national
Network Operators requirements and existing propagation characteristics. The hop lengths are considered to be
normally up to 37 km in the 13 GHz band, up to 30km in the 15 GHz band and up to 20 km in the 18 GHz band.
The parameters to be specified fall into two categories:
a) Those that are required to provide compatibility between RF channels occupied by different sources of
equipment on the same route connected either to:
- separate antennas; or to
- separate polarization of the same antenna.
NOTE: Equipment supplied by different manufactures on the same path and using different polarizations shall
operate on different frequencies.
b) Parameters defining the transmiss (...abbreviated)