ASUS ASUS VivoBook Max X541UA Manual De Usuario

ノートパソコン ユーザーマニュアル

91

On 4th August 1998 the European Council Decision regarding the CTR 21 

has been published in the Official 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 justified case service) in which network addressing, if provided, 

is by means of dual tone multi-frequency signalling.

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 notified networks with which the 

equipment may have inter-working difficulties.”
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 notified 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 first modems which do not 

require regulatory approvals in each individual European country.

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.