Release 1.0
Configuring the CMTS
526360-001-00 Rev. B
MGBI
6-171
Table 6-19 Troubleshooting CM Problems
Cause or Symptom
Problem
Subscriber CM shows a lot of flap list
activity
CM is having communication problems with
the BSR.
Subscriber CM shows little or no flap list
activity.
The CM is communicating with the BSR
effectively, however there is still a problem.
The problem can be isolated to the
subscriber’s CPE computer equipment or the
CM connection.
Ten percent of the CMs in the flap list
show a lot of activity.
These CMs are most likely having difficulties
communicating with the BSR.
CMs have a lot of power adjustment
(P-Adj) errors.
CMs have problems with their physical
upstream paths or in-home wiring problems.
Use corresponding CMs on the same physical
upstream port interface with similar flap list
statistics to quickly resolve problems outside
the cable plant to a particular node or
geographic location.
All CMs are incrementing the insertion at
the same time.
There is a provisioning server failure.
A CM has more than 50 power
adjustments per day.
The CM has a suspect upstream path.
Corresponding CMs on the same physical
upstream port interface with similar flap list
statistics can be used to quickly resolve
problems outside the cable plant to a
particular node or geographic location.
A CM has roughly the same number of
hits and misses and contain a lot of
insertions.
There is a problematic downstream path. For
example, the downstream power level to the
CM may have a power level that is too low.
A high flap list insertion (Ins) time
number.
Intermittent downstream synchronization loss.
DHCP or CM registration problems.
Low miss/hit ratio, low insertion, low
P-adj, low flap counter and old
timestamp.
Indicates an optimal network situation.
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