User's Manual Part 2

11: Monitoring the Network
APCD-LM043-8.0 (DRAFT C) 173
that is active, which is seldom the case after more than one EUM
have been activated.
The statistic
rxPktsDuplicate measures the number of times the CCU sends the same packet
of information more than one time. A high value of
rxPktsDuplicate indicates that the
acknowledgements from the EUM are not being properly received at the CCU.
11.6 User Data
The total user data is recorded by the statistics Rx Data Payloads, Tx Data Payloads, Rx Data
Octets
, and Tx Data Octets. These statistics could be viewed as billable data and allow you to
monitor total usage at the EUM level.
11.7 Logging CCU or EUM Statistics
The system log is an extremely powerful tool since it has accurate absolute time stamps and
can be downloaded very quickly using FTP. The system log has two roles:
• To assist in troubleshooting unit and network problems. The MAC statistics for the
CCU and EUM are recorded hourly and are very useful, especially when an absolute
time reference is entered to coordinate the logs.
• To monitor individual unit traffic after the fact, which is useful if any unit is in trouble. It
can also be helpful with billing information. By recording information to the log, events
of interest are less likely to be missed, as can happen with real-time monitoring.
The system log records every command you enter, either through the serial console port or
through a Telnet session, which can be useful when troubleshooting problems. The system log
also saves the statistics defined below at each recording period. Each statistic line is preceded
by the date/time stamp and the “statN” label, where “N” is the line number. If the statistics are
recorded every 15 minutes, then the system log can hold at least 36 hours worth of data.
Since not all counters are large numbers, the log can typically contain information for the last
2-3 days. The system logs can be downloaded during quiet hours to avoid affecting system
performance during peak periods. Downloading the logs every 2 days should ensure that all
statistics are retrieved for each unit.
To control system logging, connect to the device with Telnet and use the following commands:
•
stats log <interval>. <interval> is the time interval in minutes between each
data sample to log. You may set the interval to any number of minutes between 1 and
65535. After entering this command, the CCU or EUM will begin logging statistics at
the specified interval. The default interval is 15 minutes.
•
stats log off stops logging statistics.
•
stats log now records the current statistics in the log without affecting the
statistics period or whether it is on or off.
•
stats log shows the logging interval.