Delivering multicast streams in a passive optical network
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United States of America Patent
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Issued Date -
Feb 19, 2004
app pub date -
May 30, 2003
filing date -
May 31, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An interface module of a Passive Optical Network (PON) maintains information associating Class-D Internet Protocol (IP) addresses for multicast streams with Asynchronous Transfer Mode (ATM) Virtual Circuit Channels (VCCs), and with nodes of the PON that have requested the multicast streams. When an interface module receives a first request for a multicast stream, it will associate a VCC and the requesting node with a Class-D IP address of the stream and deliver the stream on the associated VCC. The interface module may periodically deliver map packets to nodes to indicate the current Class-D IP to VCC mappings, and subsequent requesting nodes may obtain the stream by referring to the map packet. The interface module deletes the association of a node with a stream when it receives a disassociation request from the node, and delivers the stream on the associated VCC so long as any node is associated with the stream.
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