M/436 -

The present document specifies technical characteristics and methods of measurements for the following equipment
types (which are parts of a Mobile Communication On Board Aircraft system):
1) The Onboard Base Transceiver Station (OBTS) supporting GSM and/or UMTS, and/or LTE communication
protocols including specific functions for restricting the transmit power of the MSs or UEs, associated with the
OBTS.
2) The Network Control Unit (NCU) preventing direct connection of the onboard mobile terminals with mobile
networks on the ground by raising the noise floor in the cabin.
The OBTSs are capable of operating in all or any part of the frequency bands given in table 1-1.
The present document applies only to radio equipment using a dedicated transmitting antenna that is designed as an
indispensable part of the system for usage on board an aircraft.
It applies to equipment for continuous and discontinuous transmission of data and digital speech.
Within the European Union, the system covered by the present document operates in accordance with the operational
requirements as outlined in the Commission Decision 2016/2317/EU [i.4] based on the former Decision 2013/654 [i.3].
In relation the NCU, some frequency bands are now optional while they were mandatory before. Due to this difference
the present document had to be reviewed.
The present document contains requirements to ensure that such Radio equipment both effectively uses and supports the
efficient use of radio spectrum in order to avoid harmful interference.
In addition to the present document, other ENs that specify technical requirements in respect of essential requirements
under other parts of article 3 of the Radio Equipment Directive [i.1] may apply to equipment within the scope of the
present document.
The present document does not cover equipment compliance with relevant civil aviation regulations. In this respect, a
MCOBA system, for its installation and operation on board an aircraft is subject to additional national or international
civil aviation airworthiness certification requirements, for example to EUROCAE ED-14G [i.7].
NOTE: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.1] is given in annex A.

DTR/TISPAN-07044

REN/MSG-TFES-1126