| 摘要 |
When a frame is received from one of PON ports 12 a to 12 c of ONUs 1 a to 1 c, an OLT 3 compares VPIDs contained in Preamble/SFD regions A of the received Ethernet(R) frame with VPIDs assigned to LAN ports 31 and 32 of the OLT 3. Upon coincidence, a PON MAC process is started. When a frame is received from a PON port 33 of the OLT 3, each of the ONUs 1 a to 1 c compares a VPID contained in a Preamble/SFD region of the received Ethernet(R) frame with VPIDs assigned to the ONUs 1 a to 1 c. Upon coincidence, a PON MAC process is started.
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