Patent ID: 7668074

Claim:
A home network system comprising: an electric device communicating with other device through a network and based on a protocol comprising an application layer, a network layer, a data link layer, and a physical layer, wherein the network is consisted of a dependent transmission medium, and the protocol further comprises a home code control sub-layer for managing a home code for network security when accessing the dependent transmission medium, the home control sub-layer processing a packet from the data link layer or the network layer, wherein, if the predetermined home code is the same as an initial home code, the home code control sub-layer processes the packet only internally to give an intrinsic home code, and wherein, if the predetermined home code is not the same as the initial home code and if the packet is a Home Control sub-layer Protocol Data Unit (HCNPDU) from the data link layer, the home code control sub-layer compares a home code included in the packet with the predetermined home code, and processes the packet according to the comparison, or if the predetermined home code is not the same as the initial home code and if the packet is a Network layer Protocol Data Unit (NPDU) from the network layer, the home code control sub-layer processes the NPDU according to a Network layer Packet Type (NPT included in the NPDU.