75
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 a 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 -2dB (NLOS link operating at sensitivity limit on BPSK
0.67) to –33dB (short LOS link running 256 QAM 0.83). See note 15.
Link Loss: The link loss is the total attenuation of the wireless signal between the two
point-to-point units. See note 15.
The link loss calculation presented below:
xxxx RTRTll ggPPP
+
+
−
=
Where
ll
P Link Loss (dB)
x
T
P
Transmit power of the remote
wireless unit (dBm)
x
R
P
Received signal power at the local
unit (dBm)
xx RT gg ,
Antenna gain at the remote and local
units respectively (dBi). The antenna
gain of the 600 Series bridge (23.5
dBi) is used unless one or both of
the Gemini units is a Connectorized
version. See Section 11.3 for more
details
Equation 2 - Link Loss