Railway Emergency Communication Wired-Wireless Conversion System Network Coverage Solution
Table of Contents:
Analysis of the Current Status of "Railway Emergency Communication"
1. Problems Existing in the "Current Status of Railway Emergency Communication":
2. Requirements of the "Railway Emergency Communication System":
II. Beijing Raytrans - "Railway Emergency Communication" Solution
2.3.2 Wired-Wireless Conversion System Solution Based on E1 Ports
2.3.3 Power Supply Design Solution
2.3.4 Structural Solution for Integrated Emergency Communication Equipment
III. Overall System Design Principles
Preface:
Analysis of the Current Status of "Railway Emergency Communication"
Railway emergency communication refers to a communication system that, in the event of natural disasters or traffic accidents or other emergency situations, ensures smooth railway transportation and enables rapid transmission of voice, image, and other information between the field and higher-level leadership authorities. It plays an important role in safeguarding railway transportation operations. The existing railway emergency communication system relies primarily on communication posts along the railway line, with the emergency command center located at the hub dispatch command center. Generally, there is one section communication post every 1.5 km along the railway. When an emergency occurs, rescue personnel transport the accident site rescue equipment to the scene, connect to the nearest section communication post, and enable leaders at all levels in the emergency command center, meeting rooms, and offices to promptly understand the on-site situation via telephone.
1. Problems Existing in the "Current Status of Railway Emergency Communication":
Currently, railway emergency communication relies mainly on the single access method of communication posts along the railway line, which can provide voice services and still image services. However, its limited bandwidth results in few supported services, slow transmission speeds, and poor transmission quality, seriously affecting emergency rescue and command operations. How to adapt to the rapid development of railway transportation, ensure railway transport safety, and achieve unimpeded communication between the control center and the emergency accident site at the earliest possible moment has become an urgent issue that railway emergency communication needs to address.
2. Requirements of the "Railway Emergency Communication System":
The railway emergency communication integrated transmission system is a rapid emergency communication system. This system should achieve full coverage of voice transmission within the emergency network, meeting the railway emergency rescue requirements for full-network coverage from wired voice to wireless voice. It should also be applicable to stations, freight yards, and other industry applications. When emergencies such as natural disasters or unexpected incidents affecting railway transportation occur, on-site rescue personnel can directly connect via handheld radios to leaders at all levels in the emergency command center, meeting rooms, and offices. This enables timely and accurate understanding of the on-site situation. Additionally, this system can be used to establish temporary internal communication facilities, allowing on-site personnel to communicate internally through wireless and wired means, ensuring real-time rescue command.
The geological conditions between small stations along the railway line are complex and sparsely populated. When unexpected incidents occur, people often cannot reach the scene at the earliest possible time, which creates difficulties for timely disaster relief organization and headquarters command and dispatch. As shown in Figure 1, rescue personnel at the accident site must contact personnel at the emergency station via handheld radios, who then run to the nearest communication post to contact the emergency rescue center. After leaders at the emergency center issue instructions, they contact the communication post from the emergency command center. The staff at the communication post then contacts the rescue personnel at the accident site via handheld phones after receiving the instructions. Although only one node relay is involved in the intermediate process, it is still sufficient to waste a significant amount of precious time. For the railway emergency communication system, the goal is to transmit the actual situation to the emergency rescue center at the earliest possible moment and to enable remote "on-site command" through wired or wireless voice communication, achieving rapid response and proper handling. It is an important means of ensuring wartime railway transportation and railway repair command and liaison. A rapid, secure, confidential, accurate, and smooth railway emergency communication system is particularly important in current and future railway transportation operations. As shown in Figure 1:
Figure 1 (Current Status Diagram of Railway Emergency Communication System)
3. Advantages of Beijing Raytrans in the Construction of the "Railway Emergency Communication System":
A manufacturer capable of providing a complete set of emergency communication system solutions must be a seasoned communication manufacturer that can supply full-line communication products or possess strong system integration capabilities. In terms of integration, Beijing Raytrans is one of the most representative manufacturers in the domestic communication industry. Beijing Raytrans has full-line communication products under its own brand. This advantage allows us to conveniently integrate various products organically and provide targeted integrated solutions for projects. For engineering contractors, integrated solutions save them the trouble of designing solutions, configuring equipment, and other tasks.
Beijing Raytrans will apply the concept of wireless-to-wired conversion to build a more rapid information transmission mode for railway emergency communication, based on the existing railway emergency communication network and its current service status, combined with the actual requirements of railway emergency communication. Based on different on-site communication conditions, a comprehensive solution has been determined with wired transmission as the primary channel, combined with wireless and satellite as three different information access methods. Focusing on the wired network as the backbone transmission channel, and through the seamless integration of wireless and wired networks, full coverage of the emergency network can be achieved, bringing comprehensive improvements to railway emergency communication.
Beijing Raytrans - "Railway Emergency Communication" Solution
2.1 Solution Overview:
Railway emergency communication is a communication system designed to ensure smooth railway transportation and enable rapid transmission of information between the field and higher-level leadership authorities. However, the existing railway emergency communication system relies primarily on communication posts along the railway line, with the emergency command center located at the hub dispatch command center. Generally, there is one section communication post every 1.5 km along the railway. Due to the disconnection between wireless and wired networks, information at the accident site cannot be transmitted to the emergency rescue center in a timely manner, seriously affecting emergency rescue and command operations. How to adapt to the rapid development of railway transportation, ensure railway transport safety, and achieve seamless communication network coverage has become an urgent issue to be addressed in current railway emergency communication.
Leveraging its profound technical strength, rich engineering project experience, and innovative design concepts, Raytrans Digital has designed and launched the "Integrated Emergency Communication Equipment" based on the requirements of low construction cost and simple installation and maintenance for each emergency communication node. This product integrates the communication power supply, audio distribution frame, IDM-WGN wired-wireless conversion system, and desktop intercom into a comprehensive configuration. Through the seamless conversion between wired and wireless networks, it enables voice service access at emergency nodes, effectively saving construction costs and meeting the requirements of the railway emergency communication system for rapid response and real-time handling. As shown in Figure 2:
Figure 2
With the development of domestic communication networks, Beijing Raytrans Digital Technology Co., Ltd. has proposed a comprehensive solution for the railway emergency communication system.
2.2 Basic Principles
1) System Reliability and Stability
The high reliability and stability of the system are the primary conditions for ensuring the safe operation of the network system. On the basis of ensuring system reliability, the availability of the system should be further improved. The high reliability and stability of the network ensure that the network can provide information access services at any time and any place. Equipment must have reliable quality and support hot-swappable features and various protections to maintain a stable operating environment.
2) System Practicality and Manageability
In today's world, communication technology and computer technology are developing rapidly. Network design must not only adapt to the trends of new technology development and ensure the advancement of the system by selecting technologies and equipment representing the world's advanced level, so that invested equipment does not become obsolete in a short period, but also take into account the maturity, standardization, and practicality of the technology.
In network design, selecting a simple and practical monitoring and management software is essential. This monitoring and management software does not need to run on a server or be operated through handheld terminals; it can run on an ordinary PC, which does not place too high demands on maintenance personnel. Ideally, the transmission equipment and access equipment throughout the entire communication network can be monitored uniformly under the same platform using a single monitoring software. Through the monitoring platform, various equipment operating statuses, fault management, configuration management, etc., can be monitored, greatly improving the maintainability of the network.
3) System Scalability and Openness
In network design, the first priority is to meet the needs of the existing network users and applications, while also considering future business development and scale expansion. Key network equipment should be designed with expansion capabilities and the ability to implement new applications on the network. At the same time, equipment should adopt open technologies, support standard protocols, have good interoperability, and support seamless connection and communication between different series of products from the same manufacturer as well as products from different manufacturers.
Flexible expansion capability: Flexible port expansion capability and module expansion capability to meet network scale expansion.
Support for new applications: Products have the technical preparation to support new applications, can meet actual requirements, and can implement new applications conveniently and quickly.
4) Protection of User Investment and Cost-Effectiveness
Network design fully protects user investment and cost-effectiveness, utilizes existing equipment, avoids duplicate waste of user investment, and, while meeting user needs and future development trends, adopts cost-effective equipment to build an economical and reliable transmission and access platform. The equipment adopted should be mainstream products in the industry today, using mainstream technologies and standard protocols, with good interoperability, reducing equipment interconnection issues and network maintenance costs, and effectively protecting user investment.
2.3 Proposed Solution
Based on the above basic principles and considering the actual situation, we provide the following solution recommendations:
2.3.1 Technical Solution for the Wired-Wireless Conversion System of the Emergency Communication System
At emergency nodes, the wired-wireless conversion system provides full-network coverage of voice signals, forming the railway emergency communication system.
As a high-end product in the current wireless-to-wired conversion field, the technical content of the IDM-WGN wired-wireless conversion system is beyond doubt. Through our company's special configuration of this series of equipment and unique configuration patents, we fully utilize the system's inherent capabilities to address the requirements of diverse service interfaces and high switching capacity, developing from providing wired voice service interfaces at the current stage toward full-network seamless connection of wired and wireless voice signals.
Based on the equipment characteristics of the wired-wireless conversion system, we can utilize the existing copper cable transmission along the railway line, introduce the copper cable through cable manholes, and use the 3 existing emergency connection terminals on the communication post to connect the voice interface of the wired-wireless conversion system via twisted pair. The system provides radio interfaces. We configure 4 different frequency bands at the communication post for construction, medical, dispatch, and emergency purposes, and support multiple radios communicating online simultaneously. Each radio operates on a different frequency band, and communication between radios does not interfere with each other. Through wired-wireless conversion, handheld radio communications can directly connect with the central equipment room, and the emergency center can command and control remote on-site work via telephone or desktop intercom. When a danger occurs at a certain location within a railway section, staff promptly notify the relevant departments, and on-site rescue personnel carry the accident site rescue equipment from the communication section to the scene. The signal is transmitted to the communication post via handheld intercom, where the wired-wireless conversion system at the communication post converts it into a wired voice signal and transmits it to the emergency center. It is then connected through the emergency center's PBX or the public switched telephone network (PSTN), enabling real-time voice communication between the field and command center leaders. This enables leaders at all levels in the emergency command center, meeting rooms, and offices to promptly understand the on-site situation and make rapid decisions. As shown in Figure 3:
Figure 3
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