Electromagnetic Compatibility and Radio Spectrum Matters (ERM); Land Mobile Service; Rules for Access and the Sharing of Common Used Channels by Equipment Complying with 300 113; Part 2: Harmonized EN Covering Essential Requirements under Article 3.2 of t
"The present document covers the minimum characteristics considered necessary in order to make the best use of the available frequencies and to avoid harmful interference between different users of a shared channel. It does not necessarily include all the characteristics (or protocols) which may be required by a user@ nor does it necessarily represent the optimum performance achievable. The present document applies to equipment designed to operate within the professional mobile radio service and to the associated frequency planning. It covers equipment fulfilling the requirements of EN 300 113 ([6] and [7]) and/or of EN 300 390 ([8] and [9]) as appropriate. The present document applies to equipment supporting the transmission of data on shared channels. It applies to digital and combined analogue and digital radio equipment that does not fulfil the requirements of another standard covering specific access protocol and occupation rules. More specifically@ this access protocol applies to single frequency simplex operation (and two frequency repeater operations with the repeater in duplex mode and the mobile units in simplex mode). This access protocol is applicable for: - multiple data only users@ independent of each other@ which do not share a common central control facility@ but may share a common single or two frequency radio channel; - multiple mixed analogue speech and data users@ independent from each other@ which do not share a common central control facility@ but may share a common single or two frequency radio channel and where speech is to have priority over data transmissions. This access protocol is not applicable for data users with common central control facilities or for trunked systems operating on dedicated non-shared channels. In the case of analogue transmissions@ the corresponding access protocol is known as the ""radio-discipline"" of the users. Within the limits set out in the present document@ each group of users may use its own communication protocol. The present document@ in conjunction with EN 300 113-2 [7] or with EN 300 390-2 [9] as appropriate@ is intended to cover the provisions of Article 3.2@ of Directive 1999/5/EC [1] (RTTE Directive)@ which states that ""...radio equipment shall be so constructed that it effectively uses the spectrum allocated to terrestrial/space radio communications and orbital resources so as to avoid harmful interference"". In addition to the present document@ other ENs that specify other technical requirements in respect of essential requirements under Article 3 of the RTTE Directive [1] may apply to equipment within the scope of the present document. NOTE: A list of such ENs is included on the web site http://www.newapproach.org/."