Echelon MPR-50 Multi-Port Router - Manual (Page 37)

UCPTinterval
This configuration property defines the interval over
which statistics are collected. Its type is
SNVT_elapsed_tm, with the default being one minute.
The maximum interval supported is 65,535 seconds
(over 18 hours). A minimum interval of 5 seconds is
enforced, which means that if this configuration
property is set to a value below 5 seconds, the
statistics interval will be 5 seconds. This is a shared
configuration property that applies to all of the
Channel Monitor functional blocks.
UCPTpacketBytesAverage
To calculate bandwidth utilization, the Monitor uses an
approximate value for the average packet size. The
average packet size defaults to 15 bytes, but can be
configured to whatever your average message size is.
UCPTpacketsPerSecondMax The bandwidth utilization calculation is made relative
to a fixed model of the maximum channel capacity of
the TP/FT-10 and TP/XF-1250 channels. The default
is 0 for all channels and should not be changed.
Alarms
The Monitor implements L ON M ARK alarms for several network variables in the
Channel Monitor functional blocks. The alarmed network variables and their default
alarm limits are listed below. These alarm limits may be modified with a network
management tool.
Note: The programmatic Network Variable name appears first. The LonMaker Channel
Monitor's Network Variable shape name is located under it, in parentheses.
Network Variable Low
Limit Low
Hysteresis High
Limit High
Hysteresis
nvoIvalCrcErr
(Last CRC Errors) N/A N/A 5% 2%
nvoIvalMissed
(Last Missed Packets) N/A N/A 1% 0%
nvoIvalBandUtl
(Last Bandwidth Use) 0% 0% 70% 5%
Alarm conditions are reported on the nvoAlarm2 output on the Node Object. This
output is of type SNVT_alarm_2 and contains a string with the current alarm
source, the error type, and the percentage value. The following alarm source strings
are used (where <n> is for router (and channel) and xx is either a whole number like
57 or a real number like 49.5.):
• Ch<n>: CRC errors (xx%)
• Ch<n>: Missed (xx%)
MPR-50 Multi-Port Router User's Guide 29