| Description | The number of times the CMTS misses the Ranging request
from the Cable Modem.
The CMTS issues a Station Maintenance packet every 10 seconds
and waits for a Ranging request from the Cable Modem. If the
CMTS misses a Ranging request within 25 msec then the Miss
Object will be incremented.
If ccsCmFlapTotalNum is high, Hit and Miss are high but
ccsCmFlapPowerAdjustmentNum and ccsCmFlapInsertionFailNum
are low then the flapping is probably caused by the modem
going up and down.
Miss 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. |