| Description | The number of times the CMTS upstream receiver flagged
a packet with a CRC error.
If ccsCmFlapCrcErrorNum is high, it indicates the cable
upstream may have high noise level. The modem may not be
flapping yet but it may be a potential problem.
This object can indicate:
Intermittent upstream,
Laser clipping, or
Noise bursts.
Laser clipping can happen if the signal power is too high
when the upstream electrical signal is converted to an
optical signal. When it happens the more input produces less
output, until finally there is no more increase in output.
This phenomena is called laser clipping.
The value of this object can be reset to zero if this entry
is removed from the table and then re-added, or if the
ccsCmFlapResetNow object was set to true(1). The value of the
object ccsCmFlapLastResetTime indicates the last reset time. |