The present document specifies the minimum performance parameters for a high capacity digital radio-relay system
operating in frequency bands with 40 MHz channel spacing in the 4 GHz, 5 GHz, U6 GHz and 11 GHz bands. The
channel capacity is 1 x STM 1 on each polarization that allows to transmit up to 2 × STM 1 signals in the same RF
channel by using both polarizations in co-channel dual polarized (CCDP) mode of operation with
cross-polar interference canceller techniques (XPIC).
The present document is also applicable to 1 x STM-1 ACCP systems operating with co-polar arrangement of
40 MHz for which the CCDP operation with XPIC is considered a non applicable option; for those systems the clauses
relevant to XPIC operation (i.e. co-channel "internal" interference) are not applicable. These systems are intended for
local high capacity links (e.g. mobile infrastructure connections) where few channels may be used by different
operators) and the crowded environment may require co-polar operation on adjacent channels.
Recognizing the benefits from the industrial point of view, two different grades of system have been defined.
Grade A: based on 30 MHz-like system technology (i.e. based on 128 states modulation) with reduced receiver
BER threshold capability.
Grade B: based on 40 MHz system technology (i.e. based on 64 states modulation) with improved receiver
BER threshold capability.
It has to be noted that STM-1 systems can be grouped in order to offer an SDH interface higher than STM-1.
The area of application of these digital radio-relay systems is foreseen to be in trunk and access networks forming part
of an SDH-network including optical rings.
Systems considered in the present document shall be able to respect ITU-R and ITU-T performance objectives.
The systems considered should operate in these networks having regard for existing hop length, which are considered to
be normally up to about 30 km t (...abbreviated)