I have heard there is a product can run ethernet on a an existing tele system. of couse , the system is a only little one, such like an inner tele system in a hotel. It said that the product can split the tele wire's frequcy. leave the lower for traditional vioce telephon. and the higher frequcy will be used to run ethnet.
I'm eager to know more about the product or the technology. any infomation ( web page, vender name and contact info) will be highly appreciated.