scope:

The present document specifies the minimum performance parameters for terrestrial digital fixed service radio communications equipments operating in the 15 GHz to 38 GHz frequency band intended to be used for point-to-point connections in local and regional networks at data rates between 2 × STM-1 (transported by one carrier) and 4 × STM-1 or STM-4 (transported by two 2 × STM-1 carriers).

Harmonized channel spacings of 56 MHz are not available in frequency bands below 15 GHz at the drafting date of the present document. However, the present document can be considered as a guideline where national frequency plans allow the use of 55/56 MHz channel spacing in other frequency bands, or where an allocation of two contiguous 28 MHz channels is possible.

The maximum transmission rate in a given bandwidth depends on system spectral efficiency, a single equipment class is defined:

Class 5: equipment spectral efficiency based on typically 128-states modulation scheme (e.g. 128-QAM, or equivalent).

However, for addressing different market requirements, the systems are further subdivided in two grades:

a) Adjacent Channel Alternate Polarization (ACAP as class 5a).

b) Adjacent Channel Co-Polarization (ACCP or CCDP as class 5b).

The above classes are indicative only and do not imply any constraint to the actual modulation format, provided that all the requirements in the present document are met.

NOTE 1: For practical reasons, for configurations in figure 1a and 1b, it may be required to separate the two carriers due to spectrum availability. However, in all cases the two carriers system is required to be capable of operating in at least one of the configurations shown above.

NOTE 2: Due to the internal functionality of the cross-polar interference canceller (XPIC) equipment on both polarization of the same channel is considered to form a single CCDP system according to figure 1c. 

The present document, defines the parameters for 2 × STM-1 (311 Mbit/s) carriers. The performance of a 4 × STM-1 or STM-4 system will be directly implicated from this definition, according to the spectrum efficiency classes 5a and 5b.

The parameters to be specified fall into two categories:

a) Parameters that are required to provide compatibility between channels from different sources of equipment on the same route, connected to separate antennas.

b) Parameters defining the transmission quality of the proposed system.

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 [9].

Safety aspects are outside the mandate of ETSI and they will not be considered in the present document. However compliance to EN 60950 [47] will be required to comply with Directive 1999/5/EC (R&TTE Directive) [8].

Technical background for most of the parameters and requirements referred in the present document may be found in TR 101 036-1 [45].