Qno Xia Nuo engineers talk about router Lightning Protection

Dangers of lightning on Electronic Devices
With the rapid development of communication technology and computer network technology, computers and networks are getting deeper and deeper into people's lives and work. It also indicates the arrival of the digital and information age. The widespread application of these micro-electronics network devices makes the problem of lightning protection more and more important. Due to the features of high density, high speed, low voltage and low power consumption, microelectronics is very sensitive to various electromagnetic interference, such as lightning overvoltage, operating Overvoltage of power system, electrostatic discharge, and electromagnetic radiation.
Lightning is the discharge between the thundercloud and the earth or between the thundercloud with a different charge. When these charges accumulate to a certain extent, the discharge will occur. Lightning generated by discharge will generate powerful voltage and release a large amount of heat energy, which is extremely destructive. According to the IEEE802-3 Ethernet standard, four hazardous LAN components and power supply networks are affected by lightning:

1. the LAN components and power supply network are affected by lightning.

2. Local Area Network Connections and static load accumulated on components.

3. overvoltage from coupling of other networks to local network cable system.

4. The potential difference between the zero point of security connected to each network component. If the management personnel take adequate protection measures, it will greatly reduce the damage caused by lightning and reduce unnecessary economic losses to the enterprise.
There are two main forms of lightning strikes: Direct Lightning strikes and inductive lightning strikes. Most of the damage caused by lightning strikes on our network equipment is caused by lightning strikes. There are three main sources:

1. The side effects of traditional lightning rods generate secondary lightning effects. Lightning Current is directed to the transmission lines in the city when it passes through the lightning rods.

2. Induction lightning strikes are introduced through power cables, signal lines, or antenna feeders.

3. The location counterattack introduces inductive lightning strikes.
A vro is an important component of network equipment. It is a concentrated concentration of data traffic in the network and connects different servers, switches, hubs, network cards, and other network devices, otherwise, it is very likely that it will directly cause itself to burn out or the network's internal servers, switches, hubs, NICS, and even PCs will be damaged, resulting in long periods of network paralysis, the direct and indirect losses are immeasurable. Sometimes, the induced voltage caused by lightning strikes is less than one attack on network equipment. Even if no network fault is caused at the time, the over-voltage attacks on network equipment over the past few years have occurred, it is easy to cause the aging of network equipment parts, and the service life of network equipment decreases sharply. The old devices are more vulnerable to damage, seriously affecting the stable performance of the network.
Router Protection
In thunderstorms, lightning protection for some network devices has become a special concern for network managers of many enterprises. However, network administrators often ignore this important issue in network management. Once a problem occurs, it is likely to cause a huge economic loss to the company. Next we will discuss the formation and hazards of lightning strikes, why are network devices vulnerable to lightning strikes, and the protection of lightning strikes so that router users can minimize unnecessary losses.
Which of the following aspects should I focus on When configuring a multi-Wan Router Network? According to senior network engineers of Sino technology, lightning protection should focus on power supply and LAN connection. Generally, a WAN is connected to an optical fiber and connected to a WAN using a photoelectric transceiver. Therefore, lightning strikes from the Internet do not need to be considered. On the contrary, lightning strikes will, on the one hand, lead to induced current, which will generate powerful electric pulses and surges in the power supply, which will directly lead to damage to the routing equipment. In addition, twisted pair wires also generate strong induced current, and even directly encounter lightning strikes, which directly leads to damage to the LAN interface of the router or even the router. In general, the grounding or lightning protection measures of the power cord of the building must be done in sufficient effort, otherwise the lightning induction voltage passes through the power cord and passes in the router to burn out the parts. For example, the optical fiber in the network is generally not afraid of lightning strikes, but the metal shielding layer is not grounded. The power supply of the server room is grounded, but the switch power supply of each building is not grounded, no power Referer is installed, and no network Referer is connected to the vswitch's entrances and exits. In case of lightning strikes, the Overvoltage Caused by twisted pair wires can easily damage the equipment. In addition, the signal lines connected to the vro are directly exposed outdoors for a long time, and network Referer must be added to the vro port, in this way, the lightning or lightning-induced current can be directly released to the ground, and the overvoltage is limited to a level that the device can withstand, so as to protect the network equipment. Therefore, we must ensure the security of the router. We must do a good job in both WAN Port Protection, LAN port protection, and power protection.
Router Lightning Protection
Currently, routers with excellent performance on the market have their own lightning protection functions. For example, in the Qno series of router products, it can be used to design a line that absorbs high-voltage burst waves. Although the product has the lightning protection function, the induction voltage produced by lightning is several thousand volts, tens of thousands of volts or even higher, no matter which brand of router, the lightning protection function provided by the vro itself alone can only solve some of the dangers caused by lightning. To further reduce the dangers caused by lightning, it is necessary to equip the corresponding lightning protection equipment. The following describes the router lightning protection measures and the corresponding lightning protection products:
Router power protection
Lightning protection equipment is installed on electricity lines in buildings or cities, however, to further ensure the security of the reason, you can consider that a lightning protection socket is used before the power access of the router to prevent damage to the router caused by the input of the lightning induction voltage through the power supply. You can install the product according to the instructions.
WAN/LAN port Lightning Protection
Generally, the WAN port is connected by optical fiber, and protection is not required if the optical fiber is not a conductor. For normal telephone line access, we can use an economical, easy-to-install, and practical method to connect a telephone lightning protection device between the WAN port and the telephone line, to protect the security of the router's internal circuit through the protection of high voltage, this solution has been used by Qno xiaoluo users and achieved the same effect. At the same time, we add a network lightning protection device between the LAN port and the network equipment such as the server, switch, HUB and nic to achieve the lightning protection effect.

The following figure shows a simple connection for lightning protection configuration. The telephone lightning protection is not only inexpensive, but also effective. It is worth your reference in the thunderstorm area.

Qno's troubleshooting of lightning damage
In the series of vro products of Qno xiaonuo, it can be used to absorb high-voltage burst line design on the power line. Compared with other similar products, this product features low capacitance, low residual capacity, large flow, and fast response. This allows devices, lines, and the Earth to form a conditional equipotential body, block potential lightning currents and safely discharge the lightning currents sensed by internal facilities from the ground. However, users with a little knowledge of lightning should know that although the router has a lightning protection function, it cannot guarantee that the product can be completely protected from lightning strikes. If we need to further prevent the dangers caused by lightning, we can minimize the dangers through the above-mentioned method or a safer solution to reduce the economic losses caused by lightning.
Generally, network products that cause damage or faults to products caused by a series of natural disasters such as thunder and lightning or do not resist external forces do not belong to products processed during the warranty period. Therefore, users must be very careful, do a Good Job of lightning protection measures to prevent losses caused by lightning attacks. You must pay for them by yourself. Many users suffer from lightning strikes when routers, switches, and ADSL cats break down together. for users in the thunderstorm area, if they do not provide lightning protection, it can be said that they have paid a lot of money.