Cat 5e connection cable.
Do I need a straight through or a crossover connection Cat 5e cable.
The Netgear FS108P is the recommended ethernet PoE switch. It requires a standard Cat 5e cable to connect from the the RJ45 sockets on the switch to the RJ45 sockets on the module. Correct connection is indicated by the illumination of the PoE LED and the flicker of the activity indicator.
The MAC address?
What is the MACi address
The MAC address is a unique value associated with a network adapter. MAC addresses are also known as hardware addresses or physical addresses. It uniquely identifies an adapter on a LAN.
MAC addresses are 12-digit hexadecimal numbers (48 bits in length). By convention, MAC addresses are usually written in one of the following two formats:
MM:MM:MM:SS:SS:SS
MM-MM-MM-SS-SS-SS
The first half of a MAC address contains the ID number of the adapter manufacturer. These IDs are regulated by an Internet standards body.
The second half of a MAC address represents the serial number assigned to the adapter by the manufacturer. In the example, 00:A0:C9:14:C8:29 The prefix 00A0C9 indicates the manufacturer is Intel Corporation.
What is Power Over Ethernet
Power over Etherneti
Power over Ethernet or PoEi technology describes a system to transmit electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. This technology is useful for powering IP telephones, wireless LAN access points, webcams, Ethernet hubs, computers, and other appliances where it would be inconvenient or infeasible to supply power separately.
Power over Ethernet is standardised in IEEE 802.3af.
Detailed Explanation
IEEE 802.3af provides 48 volts DC over two pairs of a four-pair cable at a maximum current of 350 mA for a maximum load power of 15.4 watts, although, after counting losses, only about 13 watts are available. A "phantom" technique is used so that the powered pairs may also carry data. This permits its use not only with 10BASE-T and 100BASE-TX, which use only two of the four pairs in the cable, but also with 1000BASE-T (Gigabit Ethernet), which uses all four pairs for data transmission. This is possible because all versions of Ethernet over twisted pair cable specify differential data transmission over each pair with transformer coupling; the DC supply and load connections can be made to the transformer center-taps at each end. Each pair thus operates in "common mode" as one side of the DC supply, so two pairs are required to complete the circuit. The polarity of the DC supply is unspecified; the powered device must operate with either polarity with the use of a bridge rectifier.
Products
802automation products monitor and control electrical appliances and equipment over internet and intranet connections.
The Networked Controllers combine an industrial controller with Power over Etherneti (PoEi), a webserver, embedded SCADA and a modbusi server to provide process control and monitoring over an intranet or internet connection.
Downloads
Downloads
Information on 802automation products is currently available by contacting us by e-mail or by using the contact form provided under the 'Contact' tab above.
A comprehensive download facility is available for registered customers to ensure that the very latest product enhancements are available at all times.
About Us
802automation
802automation grew out of the realisation that the future of industrial and domestic automation depends upon communications between individual components just as much as the performance of each individual component. In fact the outcome is far more powerful than the sum of the individual components. The founders of 802automation bring together that rare combination of cutting edge enthusiasm with experience that can only be acquired from a successful lifetime working in this demanding industry. Their unique skill set has enabled 802automation to cherry pick the best solutions to integrate network technology, such as TCP, IP, dhcp, smtp, tftpi, http protocols with proven industrial control techniques and new web technologies such as svgi, XML and AJAXi.
