The present document specifies the minimum performance parameters for terrestrial fixed services radio
communications equipment, as given below, for operation in the 13 GHz, 15 GHz and 18 GHz frequency bands
(i.e. 12,75 GHz to 13,25 GHz, 14,50 GHz to 15,35 GHz and 17,70 GHz to 19,70 GHz).
The equipments covered by the present document are intended for operation with about 28 MHz basic channel spacing
with frequency re-use either in 14 MHz interleaved mode or in co-channel mode (definitions are in
ITU-R Recommendation F.746-4 [26]).
The present document covers equipment for the transmission of sub-Synchronous Transport Module level-1 (STM-1)
digital signals with a Virtual Container-3 (VC-3) 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 architecture and functional aspects
should be in accordance with ITU-R Recommendation F.750-3 [7] and transmission characteristics and performance
requirements in accordance with ITU-R Recommendation F.751-2 [8].
The present document does not cover aspects related to test procedures and test conditions which are currently under
study in TM4.
The application of these Digital Radio Relay Systems (DRRS) is anticipated to be for point-to-point links in local,
regional and national networks, mobile base station connections and customer access links. Consideration has to be
given to special requirements of the local network (e.g. simple towers with less space for antenna, different network
structures with high density nodes).
The systems considered in the present document are intended to operate on average hop lengths about 15 km for
18 GHz band, 20 km for 15 GHz band and 30 km for 13 GHz band.
Equipment should be designed in order to meet network performance and (...abbreviated)