| 摘要 |
The present invention provides multi-channel protection switching systems and methods for increased reliability and reduced cost. Advantageously, the multi-channel protection switching systems and methods of the present invention use pre-FEC rate measurements, and changes in pre-FEC rate measurements, to detect and avoid potential link failures before they occur. The multi-channel protection switching systems and methods of the present invention also use "wavelength-hopping" and other protection schemes to alleviate wavelength and time-dependent optical propagation impairments. Advantageously, the multi-channel protection switching systems and methods of the present invention switch proactively on diminished, rather than failed, signals; do not require the pre-provisioning of bandwidth through an alternate physical path; allow for switching in either the electrical or optical domain; and incorporate buffering of the data sources involved such that they may be synchronized, thereby providing "hitless" switching between channel sources on the client side.
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