Patent ID: 7962037
Filing Date: 2011-06-14
Classification: H04J,H04L,H04Q

Abstract:
1. A passive optical network (PON) system comprising: an optical local terminal connected to a wide area network; a first optical network unit (ONU) connected through the PON to the optical local terminal, where the first ONU selectively sends a downstream frame of multicast data received from the optical local terminal to at least one first user terminal; a second optical network unit (ONU) connected through the PON to the optical local terminal, where the second ONU selectively sends the downstream frame of multicast data received from the optical local terminal to at least one second user terminal; and a server connected through the wide area network to the optical local terminal, the server transmitting multicast data to the optical local terminal, wherein the optical local terminal receives multicast data from the server and sends the multicast data over the PON, and wherein, when the server sends a confirmation message to the optical local terminal and the optical local terminal sends the confirmation message to the first ONU and the second ONU, the first ONU sends the confirmation message to the first user terminal and the second ONU sends the confirmation message to the second user terminal, only one of the first ONU and the second ONU having a response obligation to the confirmation message transmits a response message to the optical local terminal indicating continued reception of multicast data.