Whether the optical and electrical combo ports can be simultaneously used on the firewall

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The optical and electrical combo ports cannot be simultaneously used on the USG2000&5000&6000.
By default, the combo port works as the electrical port. To use the combo port as the optical port, you must specify its working status.

Other related questions:
Can the PSTN port and the network ports of the MC850 be used simultaneously?
The PSTN port and the network ports of the MC850 cannot be used simultaneously. The PSTN port is mainly used for regeneration. The endpoint cannot place PSTN calls unless the network cable is disconnected first.

How to configure a combo interface to work as an optical interface or electrical interface
By default, a combo interface works in the auto mode. The combo interface automatically works as an optical interface or electrical interface. -If a network cable is not connected to the interface, the combo interface works as an optical interface when an optical module is installed on the interface. -If a network cable is connected to the interface and the interface is in Up state, the combo interface works as an electrical interface when an optical module is installed on the interface. -If a network cable is connected to the interface and the interface is in Down state, the combo interface works as an optical interface when an optical module is installed on the interface. -If a network cable, an optical module, and an optical fiber are installed on the interface, the combo interface works as an optical interface after the device restarts. You are advised to run the combo-port { fiber | copper } command to forcibly configure the combo interface to work as an electrical interface or optical interface. If a combo interface is forcibly configured to work in a different mode from a remote interface, the two interfaces cannot communicate.

Whether the NM_ETH port or the ETH port is used for communication between optical NEs and electrical NEs when optical NEs and electrical NEs are separated from each other
The NM_ETH port (the one connecting to the NMS) is used for communication between optical NEs and electrical NEs.

Can the two PC IN ports on the TE series endpoint be used simultaneously?
The two PC IN ports on the TE series endpoint cannot be used simultaneously.

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