Wilan LIBRA 5800 AP, User Manual

Page: 122 / 156

Appendix D: Linktest and Link Statistics
122 Libra 5800 Series User Guide
5. Press
Esc
to exit Linktest and return to the command line prompt.
R
Statistics measured at the Linktest remote
L
Statistics measured at the Linktest local
RSSI
Received signal strength indicator. A good value is -60 to -65. The receive
sensitivity is -75 for the CPE and -78 for the AP
Fade Margin
Number of dB by which the received signal strength exceeds the minimum
receiver sensitivity. A good value is 15, assuming the RSSI = -60. The higher
the fade margin the better.
BER(1E6)
Bit error rate before forward error correction. 1E-6 is the default setting. The
tester can configure this value. The ideal result is zero, using the default
setting.
FEC Corrected
Byte errors that were corrected by forward error correction. Ideally, this
should be zero, but 100,000 could be tolerated at RSSI = -75 to meet a BER
of 1E-6.
Missed Frames
The number of frames sent to, but not received by, the Linktest local. Ideally,
this number should be zero. The key numbers are the BER and the FEC
Corrected Bytes.
Loopback
Frames
The number of frames received by the local. This should be 781, using the
default setting of 1E-6. It changes according to the accuracy specified in the
Linktest.
For more information about RSSI, Fade Margin, BER, FEC Corrected and Missed Frames, see
MAC Layer Statistics , page 84