Of the four types of SONET transmission equipment, what performs the 3R (Refresh/ Re-amplify, Reshape, Retime) function?
A.
Path Terminating Equipment
B.
SONET Terminating Equipment
C.
Regenerator
D.
Add/Drop Multiplexer
E.
Digital Cross-Connect System
F.
Line Multiplexing Equipment
G.
Post/PreAmplifier