1. What is POE power supply?
PoE (Power Over Ethernet) POE power supply is usually referred to as "active power Ethernet" also known as "Power over Ethernet." Briefly, it is used to power the device under Category 5 network cable
2, application scenarios, and POE power supply POE power supply coverage in the large-scale action to build a wireless network?
Power is typically used POE: a terminal used in some IP-based (IP phones, wireless access points, network cameras, etc.), but also to provide power for the device is transmitting data signals CC.
A typical solution is to resort to use wireless coverage POE power box is constructed of a wireless access point. Currently, a wireless network coverage schemes resort typically established by a CA having a plurality of wireless access points. Since each AP has a separate power supply, if the power fed to 0x7D0, it is necessary to separately provide wireless AP wirelessly AC cable is connected to each network adapter cable to power wireless AP. Too costly, complicated and easy to operate security. When using POE power supply, simply add a POE switch connected in the middle of the AC AP wireless access point, can supply uniform power to each of the wireless access point connected via a single cable by another cable.
3, POE power supply origin
IEEE standards set in 1999, manufacturers have participated in the first 3Com, Intel, PowerDsine company, Nortel, Mitel and National Semiconductor. However, the disadvantage of this rule is to limit the expansion of the market. Until June 2003, IEEE adopted the detection and power control systems and remote routers standard 802 3AF well-defined problems, switches and hubs via Ethernet cable to power wireless access, rules of IP telephony, security systems and devices such as point. The development of IEEE 802.3af contains many experts the company's efforts, which also makes this standard can be tested in various ways.
4, POE standard power supply
Compliance with IEEE 802.3af (15.4 W) becomes a predetermined first standard Ethernet PoE power latest standards using a standard Ethernet cable conventional power transmission and data transmission, and to maintain compatibility of existing Ethernet systems and network users. IEEE 802.3af standard is based on the new standard Ethernet PoE system power, directly by the network based on the IEEE 802.3 standard, extended existing standards Ethernet, the increase in the first distribution line related standard power supply energy to meet international standards .
5, PoE power supply principle
The fifth class fifth class has four pairs of standard Ethernet cable, but only two pairs L0M BASE-T and 100M BASE-T media. IEEE80 2.3af allows two purposes:
When the application space feed, fourth and fifth pins are connected to the positive electrode, and the pins 7 and 8 are connected to the negative electrode. (May be simply understood as: network cable eight small line 4 for transmitting or receiving data, a power source 4);
When the application data pin receiving power, the DC power supply transformer is applied to the midpoint of the transmission without affecting the data transmission. In this manner, 1,2 and pair 3,6 may have any polarity.
The standard does not allow simultaneous application of the first two cases. PSE can provide a power supply purposes, but the power PD applications must be able to accommodate both cases. This power is generally standard 48V, 13W. PD 48V conversion device easier to provide at a low voltage, but must have a safety insulation voltage of 1500V.
6, PoE power parameter
Complete power supply system consists of PoE equipment (PSE) and a power device (PD) composition. PSE device is powered Ethernet equipment Ethernet client devices, PoE Power over Ethernet is the administrator throughout the process. The PD accepts power PSE load, i.e. the client device POE systems, such as IP telephony, network cameras, AP, and PDA or a mobile phone charger. (In fact, any power). Up to 13 W of the device may receive power from a corresponding RJ45 jack. This connection state based on both the IEEE 802.3af standard, related for establishing the PD device, the device type information and the power consumption level, and a power PD as Ethernet.
The main parameters of the standard POE power supply system is:
1. Voltage between 44 to 57V, a typical value of 48V.
2. The allowable maximum current is 550 mA, the maximum starting current of 500 mA.
3. Typical operating current of 10 to 350 mA, the overload detection current from 350 to 500 mA.
4. The maximum current at no load, as desired 5 mA.
The request to provide five power device PD, from 3.84 to 12.95W, up to 13W.
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