Detail of JT/T 794-2019

Introduction of JT/T 794-2019

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces JT/T 794-2011 GNSS for operating vehicles — Technical specification for vehicle terminals. In addition to editorial changes, the following main technical changes have been made with respect to JT/T 794-2011: ——The definitions of start time of travelling, effective parking and cumulative driving time have been added (see 3.1.3, 3.1.4 and 3.1.6); ——The definition of single continuous driving time has been modified (see 3.1.5 herein and 3.1.3 in 2011 edition); ——The terminal IMEI number has been added (see 4.3); ——The protection requirements for trailer terminal have been added, (see 4.6); ——The requirements for self-test frequency have been added (see 5.1); ——The function of BeiDou positioning has been added (see 5.2.1); ——TD-LTE, FDD-LTE and LTE-V2X communication modes have been added (see 5.3.1); ——The requirements for encrypted transmission have been added (see 5.3.2); ——The requirements for driver's identity have been modified (see 5.4.1 herein and 5.4.1 in 2011 edition); ——The requirements for taxi operation data acquisition have been deleted (5.4.5 in 2011 edition); ——The requirements for travelling data record have been modified (see 5.5 herein and 5.5 in 2011 edition); ——The information acquisition requirements for electronic travel permit have been modified and the requirements for data transmission encryption have been added (see 5.4.2 herein and 5.4.2 in 2011 edition); ——The requirements for image information have been modified and the requirements for highest resolution have been added (see 5.4.6 herein and 5.4.7 in 2011 edition); ——The requirements for audio information have been deleted (5.4.8 in 2011 edition); ——The requirements for video information have been modified and the requirements for highest resolution and video frame rate have been added (see 5.4.7 herein and 5.4.9 in 2011 edition); ——The requirements for vehicle state information acquisition have been added (see 5.4.8); ——The monitoring requirements have been modified, and the requirements for monitoring through data link and storing the monitoring data locally have been added (see 5.6 herein and 5.6 in 2011 edition); ——The call requirements have been modified, and the call function through data link have been added (see 5.7 herein and 5.7 in 2011 edition); ——The time requirement for entering sleep state after the engine shutdown and the sleep requirement of trailer terminals have been added, and the requirements for vehicle start-up and ignition detection function and the average power requirement of terminals in sleep have been modified (see 5.8); ——The reminders about restricted period, antenna disconnection, tyre pressure abnormality, collision, rollover, unsafe driving behavior and right-turning blind zone abnormality have been added (see 5.9); ——The terminal management requirements have been modified, and the requirements for data transmission encryption have been added (see 5.10 herein and 5.10 in 2011 edition); ——The requirements for calling service have been deleted (5.13 in 2011 edition); ——The requirements for multi-centre access have been modified, as well as requirements for domain name access mode (see 5.13 herein and 5.14 in 2011 edition); ——The requirements for automatic shutdown of communication and ETC function have been added (see 5.14 and 5.15); ——The requirements for power-off protection performance have been deleted (see 6.6.2 in 2011 edition); ——The adaptability to mechanical environment has been modified (see 6.5.2 herein and 6.5.2 in 2011 edition); ——The transient immunity requirements have been deleted (6.6.2 in 2011 edition); ——The requirements for transient conducted immunity along the power line have been added (see 6.6.2); ——The requirements for immunity to disturbances from electrical transient transmission by coupling have been added (see 6.6.3); ——The requirements for vehicle ignition resistance have been deleted (6.7 in 2011 edition); ——The installation requirements of the terminal host have been modified, and it has been made clear that the vehicle speed signal input of the terminal shall be taken from the pulse signal of the vehicle speed sensor, and the brake signal input from the brake switch quantity signal (see 7.2); ——The inspection rules have been added (see Clause 8); ——Table A.1 "Basic functional requirements of various transport vehicle terminals" in Annex A has been modified (see Annex A hereto and Annex A to 2011 edition). This standard was proposed by and is under the jurisdiction of National Technical Committee on Road Transport of Standardization Administration of China (SAC/TC 521). The previous edition of this standard is as follows: ——JT/T 794-2011. GNSS for operating vehicles — Technical specification for vehicle terminals 1 Scope This standard specifies the general requirements, functions, performance and installation requirements and inspection rules for the vehicle terminals of GNSS for operating vehicles. This standard is applicable to the vehicle terminals on-board in GNSS for operating vehicles. 2 Normative references The following referenced documents are indispensable for the application of this standard. For dated reference, only the edition cited applies. For undated references, the latest edition (including any amendment) applies. GB/T 4208 Degrees of protection provided by enclosure (IP code) GB/T 19056 Vehicle travelling data recorder GB/T 19951-2005 Road vehicles — Test methods for electrical disturbances from electrostatic discharge GB/T 21437.2-2008 Road vehicles — Electrical disturbances from conduction and coupling — Part 2: Electrical transient conduction along supply lines only GB/T 21437.3-2012 Road vehicles — Electrical disturbances from conduction and coupling — Part 3: Electrical transient transmission by capacitive and inductive coupling via lines other than supply lines GB/T 28046.1 Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 1: General GB/T 28046.3-2011 Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 3: Mechanical loads JT/T 617.5 Regulations concerning road transportation of dangerous goods — Part 5: Consignment JT/T 766-2009 Technical requirements for shipborne monitoring equipment of BeiDou navigation satellite system JT/T 825 IC card license for road transportation QC/T 1067.1 Connector used in automobile wire harness and electrical device — Part 1: Definition, test method and requirement GB/T 31465.3 Road vehicles — Fuse-link — Part 3: Fuse-link with blade type QC/T 414 Design rule of color and type code for automotive cables YD/T 1050 Test Specification for 800 MHz CDMA Digital Celluar Mobile Telecommunication Network: Terminal Part YD/T 1214 Technical requirement of 900/1800MHz TDMA Digital Cellular Mobile Telecommunication Network General Packet Radio Service (GPRS) Equipment: Mobile Stations YD/T 1367 Technical requirements for user equipment of 2GHzTD-SCDMA digital cellular mobile communication network YD/T 1547 Technical requirements for 2GHz WCDMA digital cellular mobile communication network user equipment (Phase 3) YD/T 1558 Technical Requirements of mobile station for 800MHz/2GHz cdma2000 digital cellular mobile telecommunication network YD/T 2575 Technical requirements for user equipment of TD-LTE digital cellular mobile telecommunications network (Phase 1) YD/T 2577 Technical requirements for user equipment of LTE-FDD digital cellular mobile telecommunications network (Phase 1) 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1.1 firmware embedded software running in the terminal microprocessor 3.1.2 electronic travel permit electronic data including vehicle, passenger and cargo information 3.1.3 start time of travelling time that the state of vehicle changes from stationary to travelling (at a speed of more than 0 km/h for more than 10 s) 3.1.4 effective parking action during which the state of vehicle changes from stationary to travelling (at a speed of 0 km/h) for at least 20 min 3.1.5 single continuous driving time duration from the start time of the travelling till the start time of effective parking for the same driver 3.1.6 cumulative driving time sum of single continuous driving time of the same driver within 24 h 3.1.7 monitoring centre software platform for monitoring vehicle road transport 3.1.8 sleep special state that the terminal remains in contact with the monitoring centre after the vehicle stalls 3.2 Abbreviations For the purposes of this document, the following abbreviations apply. CAN——Controller Area Network IMEI——International Mobile Equipment Identity GSM——Global System for Mobile Communication CDMA——Code Division Multiple Access TD-SCDMA——Time Division-Synchronous Code Division Multiple Access WCDMA——Wideband Code Division Multiple Access CDMA2000——Code Division Multiple Access 2000 TD-LTE——Time Division-Long Term Evolution FDD-LTE——Frequency Division Duplexing-Long Term Evolution LTE-V2X——Long Term Evolution-Vehicle to Everything JPEG——Joint Photographic Experts Group ETC——Electronic Toll Collection   4 General requirements 4.1 Composition of vehicle terminal 4.1.1 Host The host of vehicle terminal [hereinafter referred to as the "terminal"] shall include microprocessor, data memory (capacity: not less than 8 GB), satellite positioning module, vehicle state information acquisition module, wireless communication module, real-time clock, data acquisition interface, which may include display, printer and card reader. If the terminal has display, printer, card reader which are not included in the host, they can be listed as accessory devices, but the host shall maintain corresponding interfaces. 4.1.2 Accessory device External devices shall include satellite positioning antenna, wireless communication antenna, emergency alarm button and voice broadcasting device. According to the basic functional requirements of different categories of vehicles in Annex A, such devices include communication devices, operation keys, card readers, printers, displays, vehicle operation status information display, information release and other devices, as well as information acquisition devices for images, videos, audio, driver's identity, electronic travel permit, logistics, operation, toll settlement and service evaluation, etc. 4.2 Appearance The appearance of terminals shall be free of rust, rust spots, cracks, fading, stains, deformation, peeling of plating and coating, obvious scratches or burrs; the plastic parts shall be free of blistering, cracking or deformation; the structural parts and control components shall be complete and free from mechanical damage. 4.3 Nameplate Terminals shall have a nameplate with clear and durable markings. The nameplate shall be mounted in an obvious position on the outer surface of the host, and the size of the nameplate shall be suitable for the structural size of the host. The nameplate shall bear the following information: a) product name, specification and model; b) name and trademark of terminal manufacturer; c) end of-manufacturing date and number; d) implementation standard reference to terminals; e) terminal IMEI No. 4.4 Characters, graphics and markings The terminals shall be provided with instructions for use. The buttons, interfaces and other parts of the panel shall be provided with characters, graphics and other markings, and meet the following requirements: a) Durable and eye-catching; b) The characters in the instructions for use, nameplates and markings shall be in Chinese, which may be accompanied with other languages as necessary. In that case, make sure Chinese characters are on the top or left side of other languages.

Contents of JT/T 794-2019

Foreword i 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 4 General requirements 5 Functional requirements 6 Performance requirements 7 Installation requirements 8 Inspection rules Annex A (Normative) Basic functional requirements of various transport vehicle terminals