This attribute records the number of times that the bus tap has
detected a loss of the fundamental clock signal used by the bus.
Each occurrence may result in the loss of one or more cells or
frames. This type of event may occur during normal operation of
the module, for example when switching from one of the bus's
clock sources to the other; it may also be caused by a hardware
fault.
The attribute's value wraps around to zero when it exceeds the
maximum permitted value.