General
The present document defines classes of environmental conditions and their severities to which telecommunication
equipment may be exposed. The severities specified are those which will have a low probability of being exceeded;
generally less than 1 % of the operating time in a year.
The present document applies to equipment mounted for stationary use including periods of erection work, down time,
maintenance and repair at weatherprotected locations defined in clause 5.
The purpose of the present document is to define a class of environmental conditions and their severities to which
equipment may be exposed. Only severe conditions, which may be harmful to the equipment, are included. The
severities specified are those which will have a low probability of being exceeded; generally less than 1 % of the
operating time in a year.
The present document applies to equipment mounted for stationary use including periods of erection work, down time,
maintenance and repair at non-weatherprotected locations defined in clause 5.
The present document specifies accessibility and interoperability characteristics for the following types of products and
services when used in emergency communications. They form together a chain of items involved in accessible
emergency communications:
• Communication terminals used in electronic communications
• Electronic communication services
• Emergency communications systems including PSAPs
• Assisting services used in electronic communication services (relay services, language translation services,
expert services)
The present document addresses technical aspects of interoperability between user equipment, originating services and
emergency communications systems, and the interoperability and functionality required to be able to route emergency
communications to the most appropriate PSAP and include assisting services when required. It specifies interoperable
and accessible emergency communications, which incorporates voice, video, and real-time text.
Focus is on SIP and IMS technologies for user equipment and originating services, and SIP technology for the
emergency communications systems. Brief information is provided on how to arrange emergency communications
access also for other technologies.
General accessibility requirements on emergency communications as well as everyday communications including
media performance aspects, functional details of the accessible media and general user interface requirements for
accessibility are specified in EN 301 549 [1].
NOTE: The relationship between the present document and essential requirements of
Directive (EU) 2019/882 [i.3], Annex I and Annex V is given in Annex AA and Annex AB.
The present document establishes a broadcasting standard for the Digital Audio Broadcasting (DAB) system designed
for delivery of high-quality digital audio and video programmes and data services for mobile, portable and fixed
reception from terrestrial transmitters in the Very High Frequency (VHF) frequency bands as well as for distribution
through cable networks. The DAB system is designed to provide spectrum and power efficient techniques in terrestrial
transmitter network planning, known as the Single Frequency Network (SFN) and the gap-filling technique. The DAB
system meets the required sharing criteria with other radiocommunication services.
The present document defines the DAB transmission signal. It includes the coding algorithms for multiplexing of audio
and video programmes and data services, channel coding and modulation. Provision is also made for transmission of
additional data services which may be programme related or not, within the limit of the total system capacity. The
present document provides information on the system configuration which includes information about the ensembles,
services, service components and linking of them.
The present document describes the nominal characteristics of the emitted DAB signal. The aspects related to the
receiver design are outside the scope of the present document.