User's Manual Part 1

36
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 histogram is calculated over a one hour period. If the
equipment has been running for less than one hour then the histogram is calculated over
the
current elapsed time. The expected range for Vector Error would be approximately 0dB (NLOS
link operating at sensitivity limit on BPSK ½) to –29dB (short LOS link running 64QAM 7/8).
Link Loss The link loss is the total attenuation of the wireless signal between the two
Point-to-Point units.
)(2
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 OS-Gemini is 23.5 dBi.
Equation 2 Link Loss
Receive Data Rate The data rate in the receive direction, expressed in Mbps and presented as:
max, mean, min, and latest histogram format.
The histogram is calculated over a one hour period. If the equipment has been running for less
than one hour then the histogram is calculated over the current elapsed time.
Transmit Data Rate The data rate in the transmit direction, expressed in Mbps and presented
as: max, mean, min, and latest histogram format.
The histogram is calculated over a one hour period. If the equipment has been running for less
than one hour then the histogram is calculated over the current elapsed time.