Dear friend！
You need to know the following:
Observe the following rules when configuring wavelengths:
1. If there is only one channel spacing, channels are automatically planned and allocated from long wavelengths to short wavelengths by default.
2. If there are multiple channels, default channels are preferentially allocated.
a. Hybrid transmission of 50 GHz/100 GHz channel spacing and 75 GHz channel spacing: It is recommended that channels at a 50 GHz/100 GHz channel spacing be allocated from short wavelengths and channels at a 75 GHz channel spacing be allocated from long wavelengths. The 50 GHz channel spacing and 100 GHz channel spacing are considered as the same type, and channels at a 100 GHz channel spacing are allocated only after the allocation of channels at a 50 GHz channel spacing.
b. Hybrid transmission of 50 GHz/100 GHz channel spacing and 62.5 GHz channel spacing: It is recommended that channels at a 50 GHz/100 GHz channel spacing be allocated from short wavelengths and channels at a 62.5 GHz channel spacing be allocated from long wavelengths. The 50 GHz channel spacing and 100 GHz channel spacing are considered as the same type, and channels at a 100 GHz channel spacing are allocated only after the allocation of channels at a 50 GHz channel spacing.
c. Hybrid transmission of 62.5 GHz channel spacing and 75 GHz channel spacing: It is recommended that channels at a 62.5 GHz channel spacing be allocated from short wavelengths and channels at 75 GHz channel spacing be allocated from long wavelengths.
d. Hybrid transmission of 50 GHz/100 GHz channel spacing, 62.5 GHz channel spacing, and 75 GHz channel spacing: It is recommended that channels at a 50 GHz/100 GHz channel spacing be allocated from short wavelengths, channels at a 62.5 GHz channel spacing be allocated from intermediate wavelengths, and channels at a 75 GHz channel spacing be allocated from long wavelengths. The 50 GHz channel spacing and 100 GHz channel spacing are considered as the same type, and channels at a 100 GHz channel spacing are allocated only after the allocation of channels at a 50 GHz channel spacing.
3. It is recommended that super-channels be allocated from long wavelengths.
Principles for setting guard bands in a G.652/LEAF fiber system: no guard band is required for hybrid transmission of 100G and 40G BPSK signals.
That's all, thank you!
