Selecting Appropriate Industrial Switch For Highway Tunnel Monitoring System

The tunnel integrated monitoring system consists of control, closed circuit television, tunnel environmental information inspection, automatic fire reporting, traffic control, ventilation and lighting control, emergency telephone, tunnel broadcasting, and other systems. Through real-time monitoring at the entrance, middle section, and exit of the tunnel, real-time image conditions inside the tunnel, as well as data information such as vehicle flow and flow rate checks, ventilation equipment working status checks, and electrical equipment parameter checks, are obtained to ensure stable driving and a good environment in the tunnel to avoid tunnel accidents.

In the on-site environment of highway tunnel monitoring system, reliability is undoubtedly the most important point. Tunnel electromechanical monitoring network can provide more reliable communication links by improving the hardware conditions and network structure of network equipment. From a hardware perspective, construction personnel need to consider factors such as the tolerance of equipment hardware to the working environment, such as the operating temperature range, EMC magnetic compatibility, installation, and power supply methods.

Industrial Switch is different from commercial Ethernet equipment, and generally adopts a compact design and DIN-rail mounting method that is more suitable for on-site cabinet installation. In order to avoid equipment damage caused by rotating component failures, it is also advisable to choose hardware equipment with a fan free design. In the parameter description of the product, a detailed description of the operating temperature range and electromagnetic compatibility should be included, with evidence of relevant admission standards attached. In field application environments in different industries, it should be noted that the selected equipment should have the certification issued by the corresponding industry organization.

Currently, the operating temperature range and electromagnetic compatibility indicators of mainstream industrial switches can generally meet the following indicators: electromagnetic compatibility performance meets the highest standards for harsh industrial environments: Level 4; The working temperature can support - 40~+85 ℃.

After selecting reliable and stable industrial switch hardware, construction personnel should also pay attention to the following considerations for screening:

1. Various redundancy modes that industrial switches can provide: including ring networks, other industrial redundancy protocols, and RSTP protocols compatible with commercial networks. Ring redundancy is a common characteristic of managed industrial Ethernet switches. Currently, the mainstream ring network redundancy has two development directions: one is the use of private protocol ring network redundancy technology; The second is to adopt a mature ring redundancy protocol compatible with commercial switches as a ring redundancy technology (commonly referred to as the industrial enhanced RSTP protocol).

In practical applications, there is no significant difference in the performance of ring network redundancy between the two types of redundancy technologies. Both are reliable ring network redundancy technologies, and the convergence time of a single network redundancy is generally within 300MS. However, industrial switches using the enhanced RSTP ring redundancy protocol have several obvious advantages in use: there is almost no difference in operation between the standard RSTP protocol and the enhanced RSTP ring redundancy protocol. Engineers familiar with commercial switches can perform on-site installation and operation according to the instructions with little or no training. The private protocol redundancy mechanism generally requires setting the management master station and slave station through the switch hardware dial code, which is prone to errors during on-site installation and debugging; The enhanced RSTP ring redundancy protocol industrial switch does not require any hardware dialing operations, making on-site installation and debugging extremely convenient. However, due to the openness of Ethernet, the security of the enhanced RSTP ring redundancy protocol poses certain security risks. During the process of establishing a tunnel industrial ring network, construction personnel have to consider the factor of network security.

When selecting an industrial switch, users should select an industrial switch that supports 802.1Q VLAN functionality to facilitate the functional division of the network. Through VLAN partitioning, construction personnel can group and isolate devices within the network based on their functions to avoid malicious human damage or misoperation. At the same time, users can use the 802.1x function in industrial switches to authorize and license devices that need to access the network, in order to distinguish between legitimate and illegal users. Mainstream high-end industrial switches currently also support the following important network security mechanisms: multi-level user passwords; Radius authentication and access security; Network intrusion detection system (IDS); Supporting SSH/SSL encryption, etc., can fully ensure the safe and reliable operation of the tunnel electromechanical system industrial ring network.

3. Technical indicators, only some key technical indicators can be listed. Based on the above introduction, the following technical requirements are made for industrial ring network switches in the tunnel site: supporting efficient industrial ring network redundancy; The terminal complies with relevant industrial standards; Redundant 24VDC power supply.

The above are the key points for selecting industrial switches in the highway tunnel monitoring system. Due to the special environment of highway tunnels, safety, ventilation, and lighting in the tunnels are essential components of tunnel construction. Based on the characteristics of highway tunnels and combined with years of research experience, we provide mechanical and electrical system solutions for urban highway tunnels, comprehensively solving video monitoring, ventilation, and lighting issues in highway tunnels from front-end networking to back-end transmission.

In the tunnel, our industrial switches have not only experienced the test of high and low temperatures, but also overcome the adverse effects that may be caused by the unique humid, mold, water mist and other harsh environments in the tunnel. Under the test of various harsh environments, our Industrial Switch has successfully delivered excellent answers with its superior hardware quality. The birth of high-quality products is not achieved overnight. From design positioning to the market, our industrial switches need to pass strict testing at all levels to easily cope with the test from the market.