What has an optical amplifier card that can be configured to operate as a preamplifier or as a booster amplifier and features up to 20-dBm total output power?

A.
L-band DWDM transport solution

B.
Mesh and multiring upgrade scalability support

C.
10-Gbps EFEC multirate transponder card

D.
4 X 2.5-Gbps and 10-Gbps EFEC muxponder cards