The Full Service Access Network (FSAN) Group has announced that several vendors of Gigabit-capable Passive Optical Network (G-PON) equipment have successfully demonstrated service level interoperability. The event, which was hosted by the independent test laboratory, KTL in Santa Clara, Calif., involved voice, data and IPTV testing between the following system vendors: Calix, Cambridge Industries Group, Entrisphere, Fujitsu, Hitachi, Huawei, Iamba Networks, Mitsubishi Electric, NEC, Siemens, Terawave.