以太网wire-wireless 转换器
思科出这个东西。有意思。具体实现方法不知如何。MAC 地址是否转换了 ？
还是物理层的Repeater ?
http://www.cisco.com/c/en/us/products/collaboration-endpoints/poes5-5-volt-power-over-ethernet-splitter/index.html
Cisco POES5 5-volt Power Over Ethernet Splitter
Additional features of the Cisco POES5 include:
Standard Category 5 Ethernet cable functionality
An 802.3af PoE port for connection back to a PoE switch
Connection to the standard DC power input and RJ45 Ethernet port on the Cisco IP phone (or other supported CiscoVoIP product) through two "split" cables
Easy concealment inside the phone stand
Figure 1. Cisco POES5 5-Volt Power over Ethernet Splitter
有机会，用用。
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