About POE（Power over Ethernet）
Summary
Power over Ethernet (PoE) is a revolutionary technology that extends the already ultra-broad functionality of Ethernet by supplying reliable DC power over the same Category 5/5e twisted-pair cable that currently carries Ethernet data. PoE, modeled after the technology used by the telecommunications industry to supply reliable power to telephones, enables lifeline quality power for IP telephones (VoIP) as well as many other low power Ethernet network machines like wireless access points (WAP) and security cameras.
POE application
After putting the fingerprint machine which embedded PoE modeled into PoE system, it is not need to use the adopter to supply power, its normal work only depend on the PoE supplying, this way provide lower cost and more flexible installation, the table 1 show as the Ethernet RJ45 connector pin number of the fingerprint machine.
Table 1 Ethernet RJ-45 connector pin number (From left to right)
| Number |
Wire Colour |
Source |
1 |
White/Orange |
TX+ |
2 |
Orange |
TX- |
3 |
White/Green |
RX+ |
4 |
Blue |
Power |
5 |
White/Blue |
Power |
6 |
Green |
RX- |
7 |
White/Brown |
GND |
8 |
Brown |
GND |
POE benefit
Lower cost. PoE eliminates the need for running both data and power wires to each network machine. WAPs and security cameras can be installed without the additional expense of contracting an electrician to install AC outlets where deployed. PoE also helps protect IT investments as it is forward and backward compatible with other Ethernet protocols. Furthermore, PoE machines that are Simple Network Management Protocol (SNMP) manageable can be remotely monitored and controlled to efficiently manage or troubleshoot power consumption and/or failures.
☆ More flexible. Network machines can be installed and re-located where performance is optimum and not tethered to an existing AC outlet. This is especially important for machines like WAPs, which may be installed in hard to reach places like the ceiling in order to achieve the broadest coverage.
☆ More reliable. A SNMP manageable centralized power source enhances the protection against power overloads, outages, surges and spikes. When PoE is implemented, along with uninterruptible power supplies (UPSs) or battery backups, it allows enterprises to distribute power even when the AC electrical power is down. This enables them to replace conventional telephones with feature rich VoIP phones while retaining the lifeline reliability benefits.
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