Table 45: Flap List Association To Potential Issues - Juniper G10 CMTS Hardware Manual

Table 45: Flap List Association to Potential Issues

Output Field Value
IM (initial maintenance High
retry flaps)
SM (missed station High
maintenance flaps)
CER (codeword error rate
High (with low CERavg)
flaps)
CERavg (average CER) High
PAdj (power adjust flaps) High
FAdj (frequency adjust High
flaps)
SNRavg (SNR average) Low
MERavg (MER average) Low
Features for Troubleshooting
Potential Issues
! DHCP server issues
! TFTP server issues
! Configuration file issues
! Noise
! Ingress
! Impairments such as common path distortion
! Laser clipping distortion
! Attenuation (too large or too small)
! Impulse noise
! Ingress
! Impulse noise
! Impairments such as common path distortion
! Laser clipping distortion
! High attenuation in the return path
! Changing environmental conditions that affect the
return path such as temperature
! Improper amplification
! Poor amplifier performance
! Significant frequency error introduced by frequency
stacking multiplexer (sometimes called block
upconversion) in the return path
! Degraded frequency stability in cable modem
! Increase in return path noise due to:
!
Amplifier thermal noise
!
Fiberoptic link noise
!
Ingress noise
! High attenuation in the return path
Any issues that affect the phase and amplitude of the
signal in the return path:
! Noise
! Impairments
! Non-linear distortions (in lasers and amplifiers, for
example)
! Linear distortions such as group delay variance
! Quality of cable modem transmitter
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Troubleshooting 143