Viavi MTS 4000 Base Unit, User Manual

Page: 150 / 254

Chapter 8 802.11 Wireless Testing
802.11 wireless results
128 User Manual 77000000206 Rev. 007
Fig. 86 Erros Results page
Table 4 Errors results
Result Definition
RX False Alarms/
Second A graphical representation of the percentage
of false alarms per second received in the
last 120 seconds. This is useful in noisy
environments to show interference.
FCS Errors Count of frame check sequence (FCS)
errors received in the last second and total
received. Frames with FCS errors have cor-
rupted payload so they are dropped.
PLCP Errors Count of physical layer convergence proce-
dure (PLCP) errors received in the last sec-
ond and total received. Frames with PLCP
errors have a corrupted header so they are
dropped.
RX False Alarms Count of false alarms received in the last
second and total received. A false alarm is
when the radio is triggered to enter the
receive state by RF energy but then realizes
that there is no 802.11 traffic. This result is
indicative of non-802.11 interference or
severely corrupted 802.11 frames.