Patent ID: 7493786

Claim:
A method for implementing MAC (Media Access control) in an Ethernet passive optical network system, the method comprising the steps of: (a) causing a physical layer of the Ethernet passive optical network system to contain LLID (Logical Link ID) information within a preamble and transfer the preamble containing the LLID information; (b) causing an RS (Reconciliation Sublayer) to configure a new Ethernet frame with said preamble and by inserting the LLID information at a predetermined position of the Ethernet frame outside said preamble, and causing the RS to transfer the new Ethernet frame up to a data link layer of the Ethernet passive optical network system; and (c) causing said data link layer to transfer said new Ethernet frame; wherein step (b) comprises the steps of: determining whether an error exists within the preamble and Ethernet frame; and if no error exists within the preamble and Ethernet frame, extracting the LLID information contained in the preamble and configuring the new Ethernet frame inserting the LLID information at a predetermined position of the Ethernet frame outside the preamble.