I. Overview
of wireless LAN is a computer network and wireless communication technology product of the combination. It uses radio frequency (RF) technology to replace the old twisted pair to form a local area network, providing all the functions of a traditional wired local area network. The infrastructure required for wireless networks no longer needs to be buried underground or hidden in walls, and can be moved or changed as needed. WLAN has become one of the effective means of broadband access, and more and more areas and services carried by WLAN are used. However, communication equipment with extremely fragile lightning protection capabilities, especially outdoor WLAN systems, can cause equipment damage, signal interruption, permanent data loss, and personal injury or death if they are struck by lightning.
The WLAN system is mainly composed of antennas, wireless APs, switches, servers and other equipment. The hazards mainly come from direct lightning strikes and lightning electromagnetic pulses. Direct lightning strikes are mainly damage caused by directly hitting WLAN system equipment. Lightning electromagnetic pulses mainly pass through The feeder, network cable, power supply and other lines cause damage to the equipment.
2. Difficult points of lightning protection In
WLAN systems, outdoor wireless APs are located on the roof or towers, etc., because it is difficult to obtain power and wiring. In most cases, POE power supply is used, and the POE switch is often tens of meters away from the AP. In the case of lightning strikes, the network cable in this distance is likely to form lightning electromagnetic pulses. The lightning electromagnetic pulses invade the wireless AP or POE switch along the network cable, causing equipment damage.
According to the characteristics of POE itself, the maximum reliable transmission distance of POE is 100 meters. When a lightning protection device or other equipment is installed in the middle, problems such as signal attenuation and power loss are likely to occur, and the power, communication effect, and transmission distance cannot be guaranteed. Very high requirements are put forward on the performance of the lightning arrester.
Three, the overall mine WLAN solutions
for WLAN lightning protection systems, in addition to lightning protection, thunder and lightning electromagnetic pulse become the focus of the work.
Direct lightning protection, the direct lightning protection system consists of air-termination devices, down conductors, and grounding devices. First, install a lightning rod for the outdoor antenna, and connect the down conductor to the ground network to ensure that it provides a discharge channel for the lightning current. The characteristic of direct lightning is that it is easy to cause damage to a certain point.
Lightning electromagnetic pulse protection. Lightning electromagnetic pulse is an electromagnetic field generated by lightning strikes, which causes overvoltages in WLAN system feeders, network cables, and power lines to invade equipment and cause damage. The characteristic of lightning electromagnetic pulse is that it is easy to cause damage to a range of several kilometers, so it has become the focus of lightning protection. WLAN system needs to install PR-F feeder surge protector, SNH-RJ45/POE network power surge protector on AP feeder port and network port respectively, and install SNH-RJ45/POE/160 network power surge protector on POE switch .
of wireless LAN is a computer network and wireless communication technology product of the combination. It uses radio frequency (RF) technology to replace the old twisted pair to form a local area network, providing all the functions of a traditional wired local area network. The infrastructure required for wireless networks no longer needs to be buried underground or hidden in walls, and can be moved or changed as needed. WLAN has become one of the effective means of broadband access, and more and more areas and services carried by WLAN are used. However, communication equipment with extremely fragile lightning protection capabilities, especially outdoor WLAN systems, can cause equipment damage, signal interruption, permanent data loss, and personal injury or death if they are struck by lightning.
The WLAN system is mainly composed of antennas, wireless APs, switches, servers and other equipment. The hazards mainly come from direct lightning strikes and lightning electromagnetic pulses. Direct lightning strikes are mainly damage caused by directly hitting WLAN system equipment. Lightning electromagnetic pulses mainly pass through The feeder, network cable, power supply and other lines cause damage to the equipment.
2. Difficult points of lightning protection In
WLAN systems, outdoor wireless APs are located on the roof or towers, etc., because it is difficult to obtain power and wiring. In most cases, POE power supply is used, and the POE switch is often tens of meters away from the AP. In the case of lightning strikes, the network cable in this distance is likely to form lightning electromagnetic pulses. The lightning electromagnetic pulses invade the wireless AP or POE switch along the network cable, causing equipment damage.
According to the characteristics of POE itself, the maximum reliable transmission distance of POE is 100 meters. When a lightning protection device or other equipment is installed in the middle, problems such as signal attenuation and power loss are likely to occur, and the power, communication effect, and transmission distance cannot be guaranteed. Very high requirements are put forward on the performance of the lightning arrester.
Three, the overall mine WLAN solutions
for WLAN lightning protection systems, in addition to lightning protection, thunder and lightning electromagnetic pulse become the focus of the work.
Direct lightning protection, the direct lightning protection system consists of air-termination devices, down conductors, and grounding devices. First, install a lightning rod for the outdoor antenna, and connect the down conductor to the ground network to ensure that it provides a discharge channel for the lightning current. The characteristic of direct lightning is that it is easy to cause damage to a certain point.
Lightning electromagnetic pulse protection. Lightning electromagnetic pulse is an electromagnetic field generated by lightning strikes, which causes overvoltages in WLAN system feeders, network cables, and power lines to invade equipment and cause damage. The characteristic of lightning electromagnetic pulse is that it is easy to cause damage to a range of several kilometers, so it has become the focus of lightning protection. WLAN system needs to install PR-F feeder surge protector, SNH-RJ45/POE network power surge protector on AP feeder port and network port respectively, and install SNH-RJ45/POE/160 network power surge protector on POE switch .
