Cisco Cable Spectrum Flap Misses

1.3.6.1.4.1.9.9.114.1.1.5.1.6

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 Misses count will be incremented. If ccsFlapTotal is high, Hits and Misses are high but ccsFlapPowerAdjustments and ccsFlapInsertionFails are low then the flapping is probably caused by the modem going up and down. Miss counts 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. Discontinuites in the value of this counter can occur if this entry is removed from the table and then re-added, and are indicated by a change in the value of ccsFlapCreateTime.