User’s Manual

ノートPC ユーザーマニュアル 81
Overview
On 4th August 1998 the European Council Decision regarding the CTR 21
has been published in the O󱐰cial 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 justied 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 Notied Body and
the vendor: “This declaration will indicate the networks with which the
equipment is designed to work and any notied networks with which the
equipment may have inter-working di󱐰culties.”
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 notied networks with which the equipment may have inter-
working di󱐰culties. 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 Notied 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.