In recent years, domestic operators have effectively supplemented WLAN networks as 3G networks in airports, high-end hotels, commercial buildings, university campuses and other high-volume data traffic sources, prompting WLAN networks to achieve rapid development in China.
In a WLAN network, reliable power supply of an AP (Wireless Access Point) is related to the security and stable operation of the AP device. At present, the way to support AP power supply is traditional mode, professional power supply and POE (PowerOverEthernet). In these modes, the power supply mode of the POE switch is gradually becoming the best solution for powering the AP device.
Traditional AP power supply hidden dangerIn the early stage of WLAN construction, most APs used power adapters to directly access power through the 220V power supply. However, when the placement point of the AP is located in the ceiling, the wall of the corridor or the outdoor, the AP is usually far away from the 220V power supply, and the 220V power supply needs to be extended through the power socket to realize the local power supply of the AP.
The traditional AP local power supply has a potential safety hazard due to the bare power socket. At the same time, the power supply time of the power supply is not guaranteed, which is limited by the business hours of the owner of the deployment point, short-circuit phenomenon during non-business hours, or the phenomenon of artificially unplugging the AP power supply in some areas, which seriously affects the stable operation of the AP. Become a more prominent problem in AP maintenance.
To ensure AP power supply and reduce AP failure rate caused by power problems, operators should consider using professional power supply or POE remote power supply to power APs to improve the reliability and maintainability of WLAN network operations. However, it is difficult to deploy a professional power supply due to the location of the AP, and the use of professional power supplies will greatly increase the cost of AP construction. POE remote power supply is the best solution for AP power supply in WLAN construction.
POE module power supply adds additional points of failureThere are two ways to power remote terminals through POE: POE module power supply and POE switch power supply. The POE switch actually implements the POE power supply function in the traditional Ethernet switch, thereby directly completing the power supply to the remote terminal through the Ethernet switch port.
The IEEE802.3af standard is based on the POE standard of the Power over Ethernet system. It adds the standard for direct power supply through the network cable based on IEEE802.3. It is an extension of the existing Ethernet standard and the first international standard for power distribution. standard.
Each POE module is an independent physical entity (as shown in Figure 2 and Figure 3). The POE module itself needs to be powered separately. After the Ethernet data signal and the output power are superimposed in the POE module, the remote terminal is powered. However, this power supply method adds an additional point of failure while solving the AP power supply problem. According to the operation and maintenance experience of operators in various cities, the POE module has a high failure rate, especially in the case of thunderstorms, the POE module is easily damaged, so that the power supply to the AP cannot be achieved.
POE switch power supply advantages are significantThe power supply of the POE switch is to embed the POE module in the access switch to implement integrated AP access and power supply. This implements the manageability of the POE power supply, improves the convenience and reliability of the AP power supply, and reduces the number of independent POE power supply modules. The point of failure also simplifies the POE power wiring system. Compared with the POE module, the integrated POE switch has the following three advantages.
save costs. In actual WLAN construction, AP devices need to be installed in places where AC power is difficult to deploy. Eliminating the need to provide local power to hundreds or thousands of AP devices will greatly reduce deployment costs and simplify manageability. With a POE switch, AP access requires only one cable instead of two cables.
Easy to install and manage. As long as the Ethernet cable is reachable, the operator can easily implement the power supply and access of the AP. The administrator can manage and control the AP through the POE switch, and provide power to the AP on time and on demand, and supply power on demand, and save energy.
Safe and reliable. The AP device can provide power supply through the access switch 100 meters away, eliminating the security risks caused by the local power supply. The PoE switch can selectively supply power to the AP device as needed. Only when the device that needs to be powered is connected, the Ethernet cable will be connected. There is a voltage present, thus eliminating the risk of leakage on the line. The POE function built-in switch effectively solves the new network failure point caused by the deployment of independent POE modules.
New demand for POE power in the 802.11n eraAt present, WLAN11n technology is gradually mature. The POE standard specified by IEEE802.3af has a power supply capacity of 15.4W, and the AP supporting 11n has a much higher radio access capability than 11b/11g. Its power is generally greater than 15.4W, and POE+ is required to supply 11nAP. The power supply capacity of each port of the POE switch is required to be greater than 15.4W. At present, mainstream equipment manufacturers such as CISCO and H3C can provide switches that support POE+.
With the deployment of the WLAN 11n network, the switch supporting the POE+ will be the focus of the mainstream equipment vendors. In the WLAN network, the POE switch power supply mode for the AP equipment will become the optimal solution.
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What are the main types of wire to wire connectors? In the connector industry, there is also a kind of product called connecting wire, which is often said to be terminal wire. Some terminals have terminals at one end, the other end is welded on the circuit board, and some have terminals at both ends. When these terminals form a male and a female, when the wire rod and wire rod form a mutual connection, the terminal can be regarded as A wire to wire connector, that is to say, most terminal blocks are a wire to wire connector product.
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