This International Standard specifies the requirements for the interface between the Home Network Lower Layer for a country's home network of standalone-type household appliances and the TCP/IP Layer for cases where it is intended to introduce a TCP/IP Layer to each of the nodes comprising such home network of standalone-type household appliances. The specified interface in the Home Network Lower Layer consists of 2 portions, the TCP/IP Interface and the lower medium-specific Interface. Figure 3 shows the composition of the Home Network Layer and the standardized portions. In the Annex, this standard specifies the requirements for IEEE 802.15.1 short-distance radio standard using the 2.4 GHz band, which complies with the laws of many countries and can be used widely around the world (future additions can also be made as necessary).