User's Manual
ノートパソコン ユーザーマニュアル
101
Overview
On 4th August 1998 the European Council Decision regarding the CTR 21
has been published in the Ocial Journal of the EC. The CTR 21 applies to all
non voice terminal equipment with DTMF-dialling which is intended to be
connected to the analogue PSTN (Public Switched Telephone Network).
CTR 21 (Common Technical Regulation) for the attachment requirements for
connection to the analogue public switched telephone networks of terminal
equipment (excluding terminal equipment supporting the voice telephony
justied case service) in which network addressing, if provided, is by means
of dual tone multi-frequency signalling.
Network Compatibility Declaration
Statement to be made by the manufacturer to the Notified Body and
the vendor: “This declaration will indicate the networks with which the
equipment is designed to work and any notied networks with which the
equipment may have inter-working diculties.”
Statement to be made by the manufacturer to the user: “This declaration will
indicate the networks with which the equipment is designed to work and
any notied networks with which the equipment may have inter-working
difficulties. The manufacturer shall also associate a statement to make it
clear where network compatibility is dependent on physical and software
switch settings. It will also advise the user to contact the vendor if it is
desired to use the equipment on another network.”
Up to now the Notified Body of CETECOM issued several pan-European
approvals using CTR 21. The results are Europe’s rst modems which do not
require regulatory approvals in each individual European country.
Non-Voice Equipment
Answering machines and loud-speaking telephones can be eligible as well
as modems, fax machines, auto-dialers and alarm systems. Equipment in
which the end-to-end quality of speech is controlled by regulations (e.g.
handset telephones and in some countries also cordless telephones) is
excluded.