1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 (b) that Study Group VIII defines the mandatory technical requirements for telematic equipment;(c) that Study Group VIII defines also optional technical capabilities which may be included in telematicequipment;(d) that there is a need to define how the ma
2、ndatory and optional technical requirements should be applied;unanimously agreesthat the Series T Recommendations shall be applied in accordance with this Recommendation.1 CCITT recommended services defined in the Series F Recommendations, excluding VideotexIn order to ensure full end-to-end compati
3、bility within a CCITT recommended service, equipment shall becapable of providing the mandatory technical requirements defined in the Series T Recommendations to which theSeries F Service Recommendation refers.2 Optional technical capabilitiesWhere optional technical capabilities are defined in CCIT
4、T Series T Recommendations, e.g. for use as nationalor regional options, the equipment shall be capable also of operating in the mandatory fallback mode. This mandatoryfallback mode provides the basic features required by the relevant Series F Recommendation, and hence the mandatorytechnical require
5、ments are met.3 Non-standardized capabilitiesThese capabilities are not defined in CCITT Recommendations but are laid down by Administrations and/orindividual manufacturers. Provision is made for the use of such non-standardized capabilities in the procedures detailedin the relevant Series T Recomme
6、ndations.Equipment shall be capable also of operating in the mandatory fallback mode which provides the basic featuresrequired by the relevant Series F Recommendation, and hence the mandatory technical requirements are met.Note 1 The term “mandatory technical requirements” covers the “basic function
7、s” in Recommendation T.60,the “basic capabilities” in Recommendation T.62, the “recommended standards” in Recommendation T.4 and the“standard capabilities” in Recommendation T.30.Note 2 The term “optional technical capabilites” covers the “standardized optional functions” inRecommendation T.60, the
8、“non-basic standardized capabilities” in Recommendation T.62 and the “recognizedoptions” in Recommendation T.4.Note 3 The term “non-standardized capabilities” covers the “optional functions” in Recommendation T.60,the “non-basic capabilities” and “private use” in Recommendation T.62 and the “non-standard capabilities” inRecommendation T.30.
