1��Scope This Part of GB/T ×××× specifies the function and performance required of each system module, except for the software model of receiver defined in GB/T ××××.××-××××. This Part respectively describes the function and required performance index of each layer and the inter-layer communication mechanism and transport protocol characteristics between layers, which provides basis not only for realization and testing of layer function and system software but also for development of application software applicable to different platforms by application supplier and design front end broadcast system. 2��Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this Part of GB/T ××××. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB 2312-1980 Code of Chinese Graphic Character Set for Information Interchange - Primary Set GB/T ××××.××-×××× Specification of Digital Television Middleware - Receiver -Part 1: Software Model SJ/T 11324-2006 Terminology of Digital Television Receiving Equipment 3��Terms and Definitions For the purposes of this part, the terms and definitions established in SJ/T 11324-2006 and the following ones apply. 3.1 Communications network A system interconnected by multiple entities, which provides point-to-point or point-to-multipoint data exchange. 3.2 Event The asynchronous communication between application and DTVM, which is implemented on DTVM and provides communication between units
