Bait-doped fiber amplifiers (EDFAs) are a key component of the new generation of optical communication systems. Which of the following is the feature of EDFA? Multiple Choice) □

Which of the following is the meaning of "L" in the optical module parameter "L-64.2"

Which of the following statements about the clock source are incorrect?

Which of the following bridges are used to forward data based on the MAC address and VLAN ID carried in the data?

Which of the following logic function blocks are involved in processing clock signals? (Multiple choice).