In the PTN equipment, what is the default TAG mark of the Ethernet port?

In the case of.1:1 protection, according to the provisions of G.8031, the source and sink devices must select the route during switching, so the APS protocol is required to coordinate the work.

After a certain distance transmission in the wavelength division system, the optical signal-to-noise ratio of the signal at the receiving end will decrease to a certain extent. The main reason is which of the following?

Which of the following logical function blocks is used for multiplexing section switching?

PTN can support in-band DCN. At this time, the port needs to enable the DCN function, so PTN equipment cannot be managed by in-band DCN during CESservices.