Scope of Echonet Development Designed for detached homes, collective housing, shops, and small- to medium-sized whole buildings. Open disclosure of APIs* and protocol standards will promote applications development and result in an open system architecture that facilitates external expansion and new entries. The physical layer will be designed to accept other transmission media as well. * API (Application Programming Interface): An interface that makes it possible to call efficiently on functions provided by the network or OS. The presence of an API greatly facilitates programming. * LonTalk®: LonTalk® is a registered trademark of Echelon Corporation in the USA and other countries. * BluetoothTM : BluetoothTM is a registered trademark of Bluetooth SIG Inc USA. * EthernetTM : EthernetTM is a registered trademark of Xerox Corporation.