The two PIU/APIU boards of the OptiXtrans E6616 or E6608 (0ptiX OSN 1800 V Pro or 1800 1 Pro) equipment use hot backup to power the system. When one PIU/APIU board fails, the system can still work normally.

When the working PQ1 board is oversized, the device will perform and the TFS protection will be reversed. Which of the following statements about the switching process are correct? (Multiple choice).

When the working channel of the optical line protection fails, it cannot automatically switch to the protection channel. What are the possible reasons? (Multiple choice)

If a network port that supports autonegotiation is connected to a network port that does not support autonegotiation, you can interconnect in both half-duplex and full-duplex modes.

If the overhead bytes pass through two plugged backplane buses, then the two slots are called paired slots that enable automatic transparent transfer of overhead bytes, such as (), () and (). Even if the SCC on the local network element The board is offline, which can also improve msP switching performance and protect DCC communication with other network elements. (Multi-quality selection).