| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To automatically derive a PON port identifier from a multicast address. <P>SOLUTION: Identifying an M-bit multicast address, and deriving an N-bit PON port identifier are carried out in an optical transmission line terminating device (OLT) of a passive light network (PON). The N-bit PON port identifier has bits smaller than the M-bit multicast address in number. Deriving the N-bit PON port identifier includes mapping N-1 least significant bits (LSB) of the M-bit multicast address to N-1 LSB of the N-bit PON port identifier and setting a 1 most significant bit (MSB) of the N-bit PON port identifier to a bit setting that designates the N-bit PON port identifier as being a multicast port identifier. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
