What statement about DCC tunneling in the ONS 15454 is true?
A.
Only the first STS frame in any OC-n signal is used for tunneling.
B.
For security reasons, the 15454 randomly assigns an STS frame from within any OC-n signal to
be used for tunneling.
C.
A different STS frame is used on each section of the ring, to prevent overlap or conflict on the
protection path.
D.
Only the last STS frame in any OC-n signal is used for tunneling (this feature is also used as a
bit rate indicator).
Explanation: