Ben, I have a question:
Where in the scenario you describe below does a modem fit that has: 1. A microphone and head-set. 2. Digitatizes the voice. 3. Voice transmission is passed through the modem as data? In essence voice transmission is not analogue. Duane >---------- Original message from Pieter Robben ---------- > >> It seems that there are some people who consider a DECT fixed part >> (basestation) as non-voice equipment. The background for this interpretation >> is that the communication between the portable part and the fixed part is in >> a digital format. The fixed part would then be TTE equipment having a >> digital (non-voice) input while having an output intended for connection to >> the PSTN network (just like a modem). So, if there is only a non-voice input >> how can it then be classified as voice equipment :) > >Hang on a minute Pieter. The decision by certain Notified Bodies to >approve DECT fixed parts based in compliance with CTR21 is based on a bit >more than the above. > >The scope of TBR21 specifies the technical characteristics (electrical and >mechanical interface requirements and access control protocol) to be >provided by a single terminal equipment which is: > >- intended for pan-European approval; and > >- capable of 2-wire access to an analogue PSTN line at the NTP; but > >- excluding terminal equipment which is capable of supporting the voice >telephony justified case as specified in Article 5(g) of Directive >98/13/EC. > >The question of what equipment is actually capable of supporting the voice >telephony justified case (point 3) can be answered by looking at CTR38 (or >alternatively CTR8 in the case of ISDN). > >The scope of TBR38 specifies the technical characteristics (electrical and >acoustic requirements) under Article 5(g) of Directive 98/13/EC to be >provided by a single, handset telephony, terminal equipment which is >intended: > >- for pan-European approval; and > >- for connection by 2-wires to an analogue interface of a PSTN. This >interface is characterised by a d.c. loop to indicate seizure and >clearing, low frequency a.c ringing signals below the speech passband to >indicate an incoming call and the transmission phase having an >approximate bandwidth of 3 kHz at the NTP; and > >- for supporting the voice telephony justified case service. > >The application of TBR38 is not however mandatory for: > >- a handset telephony function with speech transmission performance >specially designed for the disabled(e.g. with amplification of received >speech as an aid for the hard of hearing); > >- a handset telephony function employing a radio link (e.g. cordless >telephones); > >- a handset telephony function with speech transmission performance >specifically designed to cater for hostile environments; > >- any handsfree or loudspeaking voice telephony function; > >- a handset telephony function employing non-linear or time variant >techniques for the processing of the signal. > >It can therefore be deduced that the facilities covered by these five >points do not fall under the voice telephony justified case and as such >can be approved for connection to the PSTN using CTR21. > >The second and fourth points are probably the most significant since they >effectively enable all cordless telephones (including DECT) and >loudspeaking telephones without corded handsets to be approved in the >same way as any non-voice product such as a simple modem. > >Additionally, the scope of CTR21 does not exclude products capable of >supporting the DECT telephony justified case, or GSM telephony justified >case, which are addressed in CTR10 and CTR20 (and previously CTR9). > >Regards > > >------------------------------ > >Ben Wrigley >Senior Approvals Specialist > >KTL >Saxon Way >Priory Park West >Hull >HU13 9PB >UK > >Phone: +44 (0)1482 801801 >Fax: +44 (0)1482 801806 >Mobile: +44 (0)802 280914 >Web: http://www.ktl.com >Email: mailto:[email protected]
