| 摘要 |
Transparent network elements ( 10 ) pass data in a data communication plane ( 24 ) over optical links ( 42 ) and pass control information in a control communication plane ( 22 ) over a out-of-fiber/out-of-band (OF/OB) network ( 44 ), such as an IP-based network. Previously developed protection state machines ( 38 ), such as those used in traditional SONET/SDH systems can be used along with new protection state machines ( 38 ), such as shared ring protection state machines. Client State machines ( 40 ) and a signaling controller ( 30 ) interface between the protection state machines ( 38 ) and the OF/OB network ( 44 ) such that the protection state machines ( 38 ) are isolated from the technicalities of transmission in the separate network.
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