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 pr (...abbreviated)