When the ACT indicator of an SDH board is off, it indicates that this board has a hardware fault and cannot be used,
Answer(s): B
In the SDH optical synchronous transmission system, which of the following bytes is used to transmit the quality and usage information of clock sources?
An optical amplifier unit compensates for line loss and extends transmission distance. Connecting multiple optical amplifier units in cascading mode can infinitely extend transmission distance of a system.
Which of the following working windows is indicated by "2" in the optical module parameter L- 64.2"?
Answer(s): C
In the Windows operating system, the log files of the U2000 program are stored in the ( ) directory of the U2000 installation drive.
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