Detail of GY/T 221-2006

Introduction of GY/T 221-2006

1 Scope This standard specifies the technical requirements and measurement methods of digital cable television system. Any equivalent measurement method that can ensure the same measurement uncertainty may also be used. In case of dispute, this standard shall prevail. This standard is applicable to the design, construction, acceptance and operation and maintenance of digital cable television system. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the document applies. GB 3174-1995 Characteristics of PAL-D television broadcasting system GB/T 3659-1983 Methods of measurement of television video channel GB/T 7401-1987 Method of subjective assessment of quality of colour TV pictures GB/T 14857-1993 The specifications of encoding parameters of digital television for studio GB/T 15943-1988 Technical specification measuring method of broadcasting audio channel GB/T 16463-1996 The method of subjective assessment of the sound quality for broadcast programmes and the technical parameters requirements GB/T 17975.1-2000 Information technology — Generic coding of moving pictures and associated audio information — Part 1: Systems GB/T 20030-2005 Specification of equipment management system for HFC network GB 106-1999 Technical specification of CATV broadcasting system GY/T 107-1992 Maintenance procedures of broadcast control system in television center GY/T 121-1995 Methods of measurement on cable television systems GY/T 134-1998 The method of subjective assessment of the quality of digital television picture GY/T 155-2000 Video parameter values for the HDTV standard for production and programme exchange GY/T 157-2000 Digital video interfaces for HDTV studio signals GY/T 158-2000 Digital audio signal interface for broadcasting studios GY/T 161-2000 Transmission of digital audio and auxiliary data in the ancillary data space of a digital television stream GY/T 165-2000 Specifications and measuring methods of digital transmit channel for master control system in TV center GY/T 170-2001 Specification of framing structure, channel coding and modulation for digital cable broadcasting system GY/Z 174-2001 Specification of service information for digital television broadcasting GY/Z 175-2001 Specification of conditional access system for digital television broadcasting GY/T 180-2001 Technical specification of HFC network physical upstream transmission path GY/T 192-2003 The full scale digital level of the digital audio equipments GY/T 198-2003 Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system GB/T 201-2004 Specification for data broadcasting in digital television system GY/Z 203-2004 Specification of electronic programme guide for digital television broadcasting GY/T 216-2006 Functional requirement and interface technical requirement of subscriber management system for DTV 3 Terms and definitions For the purpose of this standard, the following terms and definitions apply. 3.1 modulation error rate ratio expressed in dB of the square sum of the nominal vector amplitude to the square sum of the error vector amplitude 3.2 pay per view separately saleable program with a start time and an end time 3.3 electronic print front-end-controlled terminal identification information (such as smart card number) that may be displayed and turned off on the screen of the user receiving-end and is usually used for anti-piracy traceability, etc. 3.4 token virtual currency stored in the smart card which may be used by the users for instant consumption at the user terminals 3.5 product programs or other services sold by operators to customers 3.6 entitle users' right to use services and the act of granting the users entitlement to use services 3.7 service a series of programs or data that may be broadcast according to the schedule under the control of the broadcaster 3.8 set top box of CA security module plug-in plug-in user terminal whose CA decryption function module is solidified on the semiconductor chip of the user terminals itself 3.9 transparent mode working mode of scrambling service that may be normally received without special entitlement 3.10 regional ban stop the normal use of one or more services in logically divided areas for which users in the logical area cannot use the service whether they have the entitlement of the service or not when a certain service is set with regional ban.

Contents of GY/T 221-2006

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Abbreviations 5 Typical structure of digital cable television system 6 Technical requirements and measurement methods of TS 7 Technical requirements and measurement methods related to front-end information source 8 Technical requirements and measurement methods related to SI and EPG 9 Technical requirements and measurement methods related to data broadcasting 10 Technical requirements and testing methods related to CA 11 Technical requirements and measurement methods related to SMS 12 Technical requirements and measurement methods of related transmission subsystem 13 Technical requirements and measurement methods related to user terminal. 14 Technical requirements and measurement methods related to network equipment management 15 On-site subjective evaluation of digital cable television system Annex A (Informative) Detailed description of TS measurement items Annex B (Normative) Sampling requirements for system measurement Annex C (Informative) Redundancy reliability requirements of the system Annex D (Informative) CA interface testing Annex E (Informative) Network equipment management functional requirements Annex F (Normative) Requirements of ASI interface working mode Bibliography