How to let us to reduce cost of wiring?

When the PLC control system and PAC networking web applications to become feasible and popular, engineers began seeking how through the same cable group as the network connection, and also for PAC, network equipment (such as Ethernet switches) or factory workshop equipment supply.

When the Ethernet and TCP/IP network (including all become workshop, control, and even the entire plant office of internal connection network), the method of standard becomes easier. Therefore, the power supply (concepts behind PoE) of Ethernet and was born. Concept

Ethernet power will become a reality

Ethernet power supply (concepts behind PoE) is a kind of allowed through a single category five twisted-pair as standard Ethernet connection, and data transmission and power supply. The traditional concepts behind PoE to 5 classes provide regular twisted-pair 48VDC voltage.

Use the concepts behind PoE two devices, a power supply device (PSE), this equipment is mainly Midspan adapter and Ethernet switches, which can be connected with power (the concepts behind PoE equipment and network connections), Another called power (PD), the equipment can be any equipment, such as wireless access points, and VOIP telephone, security cameras and other digital devices.

802.3 standard specifies the af two TypeA operation mode: in power and data model, through the same data, such as 10/100Base - T Ethernet for transmission, But in TypeB mode control engineering, power through the net all rights reserved for use of data. TypeB mode choice depends on the pattern or TypeA PSE equipment, instead of PD equipment. In addition, the standard also shows PSE equipment can use any a kind of mode, but do not use two kinds of patterns.

Because there are many use do not conform to the standards of the examples, so PSE equipment used in power equipment to PD PSE equipment shall be checked before PSE equipment meets the standards. If the PD equipment does not accord with a standard, then automatically stop supply PSE equipment. So when the Ethernet, the power use (integrated in each accord with standard equipment of 802.3 af) can prevent do not conform to the standards of equipment malfunction.

With a 25kOhm the concepts behind PoE equipment as concepts behind PoE resistors, "signature". When the switch or other PSE test equipment to the signature resistors, it will automatically detect the connection to the resistor in automatic detection equipment, and after the equipment for success. When not connect any resistor equipment, equipment will be closed PSE concepts behind PoE power.

Why should use Ethernet power supply (concepts behind PoE)?

Through the same cable and power and Ethernet data in the field environment means to reduce the number of cables will be. In a typical manufacturing factory environment, the cost of wiring and maintenance fees often considerable. According to the factory and industrial environment of different locations, wiring for 10 - usually cost $100 feet. Therefore, engineers and designers of the cost of wiring high attention.

Network equipment and many site equipment need to work, but the DC power over long distances industrial environments using DC power is not feasible, and therefore must be within the scope of appropriate use of AC turn DC power.

Such engineers and designers must provide a AC power and signal or cable. Usually in factory workshop environment, the power supply include a duplex outlet, and bring a wall hung install adaptor.

From the perspective of maintenance, through five classes for Ethernet devices twisted-pair power is a big improvement and progress. Not only because of the cost reductions to wiring, is due by the same power and data transmission cable group, troubleshooting and maintenance easier, so fast in the security of the transmission speed, when the cables or damage repair connection is also becoming more easily