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Chapter 7: Operation
System summary and status
Page 7-10
Attribute
Meaning
Receive Power
The maximum, mean, minimum and latest measurements of Receive
Power (dBm). See
Vector Error
The maximum, mean, minimum and latest measurements of Vector
Error (dB). See
Vector Error compares the received signals In phase / Quadrature (IQ)
modulation characteristics to an ideal signal to determine the composite
error vector magnitude. The expected range for Vector Error is
approximately -2 dB (NLOS link operating at sensitivity limit on BPSK
0.67) to -33 dB (short LOS link running 256 QAM 0.83).
Link Loss
The maximum, mean, minimum and latest measurements of Link Loss
(dB). See
. The link loss is the total
attenuation of the wireless signal between the two point-to-point units.
The link loss calculation is:
x
x
x
x
x
x
R
T
R
T
R
T
ll
c
c
g
g
P
P
P
−
−
+
+
−
=
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)
x
x
R
T
g
g
,
= Antenna gain at the remote and local units respectively
(dBi). This is the gain of the integrated or connectorized antenna.
x
x
R
T
c
c
,
= Cable loss at the remote and local units respectively (dB). It
is RF cable loss which connects ODU to Connectorized antenna.
For connectorized ODUs, the link loss calculation is modified to allow for
the increased antenna gains at each end of the link.
Transmit Data Rate
The maximum, mean, minimum and latest measurements of Transmit
Data Rate (Mbps). See
Receive Data Rate
The maximum, mean, minimum and latest measurements of Receive
Data Rate (Mbps). See
Link Capacity
Variant
Link Capacity Variant is always Full in PTP 670.
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 on 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.