1902.1 is the "physical layer" workgroup with 17 corporate members. the workgroup was formed in late 2006. the final specification was issued as an ieee standard in march 2009. the standard includes such things as packet encoding and addressing specifications. the protocol has already been in commercial use by several companies, in asset visibility systems and networks (see www.rubee.com). however, ieee 1902.1 will be used in many sensor network applications, requiring this physical layer standard in order to establish interoperability between manufacturers. a second standard has been drafted 1902.2 for higher level data functions required in visibility networks. visibility networks provide the real-time status, pedigree and location of people, livestock, medical supplies or other high-value assets within a local network. the second standard will address the data-link layers based on existing uses of the rubee protocol. this standard, which will be essential for the widespread use of rubee in visibility application's, will support interoperability of rubee tags, rubee chips, rubee network routers and other rubee equipment at the data-link layer.