| 摘要 |
A two-fiber ring architecture capable of carrying multiple wavelength channels and allowing client self-healing of single point failures. The ring architecture includes a two-fiber optical ring carrying at least one wavelength channel, wherein the wavelength channel has working traffic and protection traffic. The optical ring can include a single ring, two interconnected rings, or multiple interconnected rings. Specifically, the ring architecture includes a first client networking element connected to the optical ring by a first pair of 2X2 add drop matrices and a second client networking element connected to the optical ring by a second pair of 2X2 add drop matrices. At least one interconnect node is also provided when more than one ring is used, wherein the interconnect node has a first 2X2 interconnect matrix and a second 2X2 interconnect matrix. The first 2X2 interconnect matrix routes the working traffic from the first client networking element to the second client networking element. Similarly, the second 2X2 interconnect matrix routes the protection traffic from the second client networking element to the first client networking element. The optical ring includes a first access ring, an inter-office (IOF) ring, and a second access ring. Access rings are connected to the IOF ring by the aforementioned interconnect nodes.
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