Are the following statements regarding the definition of SDH correct?
In WDM systems, it is ideal to use a dielectric thin film filter (TFF) when using less than () wavelengths.
In the OTN standard system, which of the following protocols defines optical transport network interfaces?
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots