Differences between forced switching, locked switching, manual switching, and exercise switching

Forced switching does not detect status of the protection channel. If the protection channel is faulty, switching is still performed.
Locked switching means that a fiber cut point is locked and no switching is performed, and the service transmitted over the path that encounters the fiber cut is interrupted.
Manual switching detects status of the protection channel. If the protection channel is faulty, switching will not be performed.
Exercise switching is not actual switching because it only checks the APS protocol.

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