Patent ID: 8031724

Claim:
An access device to connect an electronic device to a dependent transmission medium, the access device comprising: a first physical layer configured to be connected to the electronic device through a serial bus; a home code control sub-layer, wherein the home code control sub-layer is located in a network layer, the home code control sub-layer configured to set, manage, and process a home code for network security; a second physical layer configured to access the dependent transmission medium, wherein the home code divides an individual network logically, when accessing the dependent transmission medium, wherein a packet is transmitted to the first physical layer from the electronic device through the serial bus, wherein the packet includes a packet type field for distinguishing a kind of the packet and a transmission counter field for retrying of the packet, wherein the packet type field is set as one of a first value specifying a request packet, a second value specifying a response packet, and a third value specifying a notification packet, wherein the transmission counter field is set based on the packet type field, wherein the transmission counter field is set in a range of 1 to 3 when the packet type field is set as one of the first value and the third value, and the transmission counter field is set as 1 when the packet type field is set as the second value, wherein the packet is transmitted to the home code control sub-layer from the first physical layer; wherein the home code control sub-layer adds a home code in the received packet; wherein the home code added packet is transmitted to the second physical layer, and wherein the second physical layer transmits the home code added received packet through the dependent transmission medium.