Which of the following is the functional unit that provides serial data for the interface and system associated with the orderwire phone?

Automatic Laser Shutdown (ALS): When no optical signal is received, the ALS function automatically turns off the corresponding optical module. This feature protects field maintenance personnel.

Which of the following descriptions of LCAS is wrong?

OCI stands for Open Connection Indication, a signal sent downstream, indicating that a management command issued upstream in the connection function has opened the matrix connection.
The signal loss status detected at the terminal point afterwards may be related to the open matrix.

The OTN electrical layer SM, PM, and TCMi overheads all contain a 1-byte BIP8 field, and the frame structure ranges they monitor are different.