Motorola PTP 300 Series User Manual page 101

Vector Error
The vector error measurement compares the received signal's In phase / Quadrature (IQ)
modulation characteristics to an ideal signal to determine the composite error vector
magnitude. The results are stored in an histogram and expressed in dB and presented as:
max, mean, min and latest. The max, min and latest are true instantaneous measurements;
the mean is the mean of a set of one second means. The expected range for Vector Error
would be approximately -1.5 dB (NLOS link operating at sensitivity limit on BPSK 0.50) to –28
dB (short LOS link running 64 QAM 0.83). See Section 7.3.1 "Histogram Data".
Link Loss
The link loss is the total attenuation of the wireless signal between the two point-to-point units.
See Section 7.3.1 "Histogram Data".
The link loss calculation presented below:
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. See Section 7.3.1
"Histogram Data". Expected data rates can be found in Section 12 "Data Rate Calculations".
Receive Data Rate
The data rate in the receive 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. See Section 7.3.1
"Histogram Data". Expected data rates can be found in Section 12 "Data Rate Calculations".
Link Capacity
The maximum aggregate data rate capacity available for user traffic, assuming the units have
been connected using Gigabit Ethernet. The link capacity is variable and depends of the
prevailing wireless conditions as well as the distance (range) between the two wireless units..
Transmit Modulation Mode
The modulation mode currently being used on the transmit channel. A list of all the modulation
modes can be found in Section 12 "Data Rate Calculations", where data rate calculations
plots are given for each available modulation mode.
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Equation 3 - Link Loss
= − + +
P P P g g
ll T R T R
x x x
Where
P
ll
P
T
x
P
R
x
g , g
T R
x x
x
is
Link Loss (dB)
Transmit power of the remote wireless unit
(dBm)
Received signal power at the local unit
(dBm)
Antenna gain at the remote and local units
respectively (dBi). The antenna gain of the
PTP 300 Series bridge (23.5 dBi) is used
unless one or both of the units is a
Connectorized version.
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