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 lhe TCP/IP Layer for cases where it is intended to introduce a TCP/TP 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/TP
Interface and the lower medium-specific Interface．Figure 3 shows the composition of the
Home Network Layer and the standardized portions．In Annex C．this standard specifies the
requirements for the lower medium—specific Interface One of these layers shall be IEEE
802．1 5．1．Short-distance radio standard additionaI layers can be added in the future)．