| 摘要 |
An optical network which can exhibit a protection function at the time of an abnormality in communication and which is effective in an optical network (PON) comprised of a mix of single configuration equipment and duplex configuration equipment, provided with transmission path switching units, individually assigning different transmission paths defined in a logical layer higher than a physical layer forming the optical transmission system to a working side and standby side of the multiplex configuration equipment, and having a subscriber side transmission path converting unit for converting paths to unique transmission paths assigned to the downstream side and an office side transmission path converting unit for converting paths to unique transmission paths assigned to the upstream side.
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