It is known that N*PTN sites are interconnected through a WDM network. At this time, which of the following interfaces will not be used for networking?

It is known that N*PTN sites are interconnected through a WDM network. At this time, which of the following interfaces will not be used for networking?
A . 10GE
B . GE
C . FE
D . POS
E . Ch STM-1
F . ATM STM-1

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Answer: F