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Common Types of Faults In Industrial Switches (Part 3)

Cable fault

In fact, this kind of fault is theoretically not the fault of the industrial switch itself, but in practice, the cable fault often causes the industrial switch system or port to not work properly, so this kind of fault is also classified as the industrial switch hardware fault. For example, the connection plug is not tight, the cable production order is wrong or not standard, cable connection should be used to cross the line but the use of direct connection, the two optical fiber in the cable staggered connection, the wrong line connection leads to the network loop.

From the above several hardware failures, the poor environment of the machine room is very easy to lead to a variety of hardware failures, so we must do a good job in the construction of the machine room, lightning grounding and power supply, indoor temperature, indoor humidity, anti-electromagnetic interference, anti-static and other environmental construction, to provide a good environment for the normal work of network equipment.

Improper configuration

Beginners are not familiar with the indoor industrial Poe injector, or due to the different configurations of various Industrial switches, the administrator often makes configuration errors when configuring the Industrial switches. For example, the VLAN partition is not correct, leading to network congestion, the port is wrongly closed, industrial switch and network card configuration mismatch, and other reasons. Such faults are sometimes difficult to detect and require some experience. If you cannot ensure that the user's configuration is faulty, restore the factory default configuration and configure it step by step. It is best to read the manual before configuration, this is also one of the habits of network management to develop. Each industrial switch has a specific installation manual, user manual, in-depth to each type of module has a specific explanation. Because many industrial switch manuals are written in English, users with poor English can consult the supplier's engineers before making specific configuration.

Industrial Poe

Industrial Poe

External factors

Due to the existence of virus or hacker attacks, it is possible for a host to send a large number of packets that do not conform to the encapsulation rules to the port it is connected to, resulting in over-busy industrial switch processor, which makes it too late to forward packets, and then leads to buffer overflow and packet loss. Another scenario is a broadcast storm, which not only consumes a lot of network bandwidth but also a lot of CPU processing time. If the network is occupied by a large number of broadcast packets for a long time, the normal point-to-point communication cannot proceed normally, and the network speed will slow down or be paralyzed.

A network card or a port failure can cause a broadcast storm. Since industrial switches can only partition the conflict domain, but not the broadcast domain (in the absence of a VLAN partition), the transmission efficiency of the network decreases significantly when the number of broadcast packets accounts for 30% of the total traffic.


Due to the variety of faults in industrial PoE, there is no fixed troubleshooting step, and some faults are often clearly oriented and can be identified at a glance. So I can only according to a particular case is particular analysis, industrial PoE manufacturer thinks: whatever the failure part for new network governance is a difficult thing, so if you want to be able to become an Industrial switches fault exclusion, is must in daily work experience, each set a question to review the root cause and solution concentration. In this way, network governance can be better completed.