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C = colorless
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Colorless wavelength means Tunable
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Colorless wavelength add drop ports allow re-configuring ROADM remotely
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That can be done when transponder or line board have been installed in the rack
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Colorless means that any carrier / wavelength can be added or dropped from any port on roadm
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Colored means the Mux and demux ports allow add and drop specific wavelength
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Colorless scenario used efficiently with ASON where we use tunable Transponders
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In this case we can flexibly tune wavelengths and perform rerouting to avoid wavelength congestion and protect network against route failure
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D = directionless
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Directionless means the wavelength carrying traffic can be transmitted to any direction
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Directioned means that the traffic will be transmitted to specific direction
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In that case a site visit required when we need to change the path of Traffic to adjust the fiber cabling
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Used with ason to dynamically detect paths and create optical cross connections
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ASON : automatic switching optical network
- ASON is a high level of optical networking routes mangment and protection allowing for network protection against multiple failures with different types of SLAs
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