ETSI has designed a modular structure for the standards. Each standard is a module in the structure. The modular structure is shown in ETSI EG 201 399 [i.1]

The present document is based on ETSI TBR 041 [4].

The technical requirements in the present document are applied under articles 3.2 of the Directive 2014/53/EU [10], concerning the effective uses of the spectrum allocated to terrestrial/space radio communication and orbital resources so as to avoid harmful interference.

These requirements are in two major categories:

emissions limits: to protect other radio services from harmful interference generated by the MES in normal use.

MES Control and Monitoring Functions (CMF): to protect other radio services from unwanted transmissions from the MES. The CMF in each MES is capable of answering to commands from the Network Control Facilities (NCF) for its S-PCN.

Receiver performance specifications: to enable reception of a wanted signal in the presence of other high power signals in the adjacent channel and/or adjacent band.

NOTE: The requirements for Network Control Facilities (NCF) for S-PCN are contained in ETSI ET 300 735 [5].

The determination of the parameters of the user earth stations using a given satellite constellation for the protection of the spectrum allocated to that satellite constellation, is considered to be under the responsibility of the satellite operator or the satellite network operators.