The user information transmission device (referred to as the “transmission device”) is an essential component of the urban fire remote monitoring system, located at the network user end. It can monitor the real-time operational status of the fire detection and alarm systems and other building fire facilities of networked users. It promptly and accurately transmits fire alarm information and device operational status information to the monitoring center, aiming to achieve early detection of fires, timely alarms, and rapid fire extinguishment. Simultaneously, it holds significant practical significance for improving the integrity and operational efficiency of building fire facilities. Therefore, China has established the mandatory national standard “GB 26875.1-2011 Remote-monitoring system of urban fire protection - Part 1: User information transmission device in this field”.
In recent years, with the continuous development of Internet of Things (IoT) technology, the functionality of transmission devices has become increasingly complex. The product cost-effectiveness required by the current standards is relatively low, imposing an additional burden on network users and hindering the widespread application of the system. At the same time, the comprehensive collection of fire facility status information, the security of north-south data transmission, and interface diversity have not been prominently reflected in the standard. Therefore, China has undertaken the revision of this standard and released a draft for public opinion at the end of December, with the deadline for comments set for February 19, 2024.
Compared to the previous version, the draft for public opinion mainly includes the following revisions:
l Integration of the indicator light functions and performance requirements of the transmission device. It stipulates that the transmission device should include four types of indicator lights: power, operation, communication, and overall fault. The meanings of flashing, long-extinguishing, and constant illumination for each type of indicator light are specified. The performance requirements for indicator lights have been raised, and they should be clearly visible at a distance of 3 meters.
l Addition of requirements for using direct current (DC) power supply. The transmission device is required to support DC power supply and be compatible with the 24V power supply of fire facilities.
l Deletion of requirements for indicator lights indicating the transmission process. The transmission process status can be comprehensively understood on the application support platform, and the indicator lights set on the device to indicate such information are useful for developers but not significant for ordinary users.
l Addition of communication requirements to ensure the anti-repudiation and integrity of data transmission between the transmission device and the application support platform.
l Addition of requirements for the resume transmission function. In case of communication failure with the application support platform, the transmission device can continue to receive information on fire facility status and upload all information after communication is restored.
l Addition of information storage requirements. The transmission device is required to store operation logs and facility operational status information, with a minimum storage capacity of 5000 historical data entries.
l Addition of timing requirements for the application support platform to the transmission device.
l Addition of interface requirements for the transmission device to collect fire facility status information. Referring to GB 4717 (fire alarm controller output interface rules), the transmission device should support one or more interfaces from RS485 bus interface, CAN bus interface, and Ethernet interface. Security requirements for using Ethernet to prevent external network intrusion are also proposed.
l Deletion of manual alarm function, check-in response function, manual reset, sound alarm, and manual mute function.