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TOADM stands for tunable optical add drop multiplexer
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it’s a kind of application scenario and shelf type in WDM
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similar to ROADM but has some additional features
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TOADM is based on what’s called CWR
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CWR : colorless wavelength router
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CWR is a Chip responsible for tunable service routing and forwarding
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TOADM is equipped with colorless ports
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colorless ports allow toadm to be connected to tunable transponders directly
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wavelengths to be added or dropped can be remotely configured
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TOADM has 3 types of ports :
1 - OMD ports : this is called optical much and demux ports
used to drop traffic to fixed multiplexer with specific wavelengths ( SFD )
2 - THRU ports : sometimes called express ports
used to connect aggregated multiple wavelengths to another TOADM as a pass through service
3 - CLS ports : it’s a colorless add drop ports connected to transponders
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