This fine-tuning process is likely to occur using control plane signaling. Once the two endpoints decide on first-order parameters like modulation format, they can refine second-order parameters, like the spacing between channels inside a superchannel.
#Controlplane sound how to
Conceivably, this decision can be refined via trial and error: the control plane decides on some rough connection parameters and establishes the connection the receivers at both endpoints measure connection performance (BER) and other metrics (CD, PMD, SNR, etc.) and decide how to tweak the connection parameters: if the BER is too high to guarantee the quality of the connection, it is improved, say, by changing the modulation format to a more robust one on the other hand, if the BER is very low, then it may be possible to improve the use of spectrum by moving to a more efficient modulation format, while still keeping the BER below the required maximum. Either way, it must be aware of the network topology, the different fiber characteristics, the spectrum utilization, and the design rules that dictate how to select connection parameters. The control plane could be fully distributed, or rely on a centralized path computation engine (PCE). The control plane is most suitable to fully unlock the value of EON, because a truly adaptive network must base its decisions on actual measured data from the network and not on offline information in planning tools, or stale information in management systems (both of which are common practice today).
Ori Gerstel, Masahiko Jinno, in Optical Fiber Telecommunications (Sixth Edition), 2013 14.2.3.2 Control plane aspects
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