K1 and K2 bytes can transmit APS switching signaling and can also indicate the failure of the signal in the multiplexing segment.

For osn3500, which of the following boards provides centralized backup capability for the +3.3V power supply of each board in the sub-shelf?

Optical module parameter "L-64.2" in "2" indicates which of the following working windows?

RSOH, MSOH, HPOH and LPOH complete the monitoring functions in a layered manner.

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.