The refractive index of the core n1 () and the refractive index of the cladding n2 are necessary conditions for the transmission of optical signals in optical fibers.

For alignment; Indicates the starting position of VC-n in the corresponding AU or TU frame. * This way: The receiver can correctly remove the corresponding VC from STM-N, and then The VC and C packages are separated into separate low-rate signals, such as PDH, which means that the low-rate path signal can be dropped directly from the STM-N signal.

Which of the following alarms will be reported when performing a fiber cut test on a common MSP ring? (Multiple choice)

The outer electrons of the bait ion have a three-level structure, among which the metastable energy level is which of the following?

It is not recommended to configure EPLAN services as a ring. If EPLAN services are configured as a ring network, the STP protocol must be enabled on the network to prevent broadcast storms.