Motorola PTP 500 User's Guide Page 400

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Managing performance Chapter 7 Operation
phn-1115_006v000
7-40
Sep 2010
System histograms
The System Histograms attributes (Table 7-13) are presented as an array of four
elements. These elements represent the maximum, mean, minimum and latest values
respectively. The maximum, mean and minimum are calculated over a running one
hour period.
To reset all histograms and restart the measurement period, select Reset System
Histograms and Measurement Period.
Table 7-13 System Histograms attributes in the System Statistics page
Attribute Meaning
Transmit Power The transmit power histogram, calculated over a one hour
period.
Receive Power The receive power histogram, calculated over a one hour
period.
Vector Error The vector error measurement compares the received signal
IQ modulation characteristics to an ideal signal to determine
the composite vector error magnitude. The histogram is
calculated over a one hour period.
Link Loss The link loss measurement is calculated as follows:
Peer_Tx_Power (dBm) – Local_Rx_Power (dBm) + 2 x
Antenna_Pattern (dBi)
The histogram is calculated over a one hour period.
Signal Strength
Ratio
The Signal Strength Ratio is:
Power received by the vertical antenna input (dB) ÷
Power received by the horizontal antenna input (dB)
This ratio is presented as: max, mean, min, and latest in an
histogram format. The max, min and latest are true
instantaneous measurements; the mean is the mean of a set
of one second means. See Histogram data on
pa
ge 7-19.
Transmit Data
Rate
The data rate in the transmit direction, expressed in Mbps
and presented as: max, mean, min, and latest in an histogram
format. The max, min and latest are true instantaneous
measurements; the mean is the mean of a set of one second
means. Expected data rates can be found in Data rate
cal
cul
ations on page 4-77.
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