Features for Troubleshooting

Table 45: Flap List Association to Potential Issues

Output Field

Value

Potential Issues

 

 

 

IM (initial maintenance

High

! DHCP server issues

retry flaps)

 

! TFTP server issues

 

 

 

 

! Configuration file issues

 

 

 

SM (missed station

High

! Noise

maintenance flaps)

 

! Ingress

 

 

 

 

! Impairments such as common path distortion

 

 

! Laser clipping distortion

 

 

! Attenuation (too large or too small)

 

 

 

CER (codeword error rate

High (with low CERavg)

! Impulse noise

flaps)

 

 

 

 

 

CERavg (average CER)

High

! Ingress

 

 

! Impulse noise

 

 

! Impairments such as common path distortion

 

 

! Laser clipping distortion

 

 

 

PAdj (power adjust flaps)

High

! High attenuation in the return path

 

 

! Changing environmental conditions that affect the

 

 

return path such as temperature

 

 

! Improper amplification

 

 

! Poor amplifier performance

 

 

 

FAdj (frequency adjust

High

! Significant frequency error introduced by frequency

flaps)

 

stacking multiplexer (sometimes called block

 

 

upconversion) in the return path

 

 

! Degraded frequency stability in cable modem

 

 

 

SNRavg (SNR average)

Low

! Increase in return path noise due to:

 

 

! Amplifier thermal noise

 

 

! Fiberoptic link noise

 

 

! Ingress noise

 

 

! High attenuation in the return path

 

 

 

MERavg (MER average)

Low

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

Page 158 Page 160
Page 159
Image 159
Juniper Networks G10 CMTS manual Flap List Association to Potential Issues, Output Field Value Potential Issues
Page 158 Page 160
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