User Manual

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Table 3-6: Data Registration Codes
DISPLAYED
CODE
LOWER
DISPLAY
RETRY MEANING
R (none) No Data registered.
1 (none) No Network access denied. Unknown reason.
2 (none) No Network ID unsupported.
3 UNAUTH3 No Network ID not authorized. (Check IP.)
4 UNAUTH4 No Bad authentication.
5 UNAUTH5 No Unsupported authentication.
6 MDS BSY Yes MDIS fully loaded.
7 DUP IP No Service denied: Duplicated IP address.
p (none) No Data registration pending.
d (none) No Data deregistration pending.
3.17.3 Receive Signal Strength Indication (RSSI)
The engineering display’s RSSI number represents, in absolute value, the
dBm level of the signal received from the OpenSky’s base station transmitter.
It represents a negative unit of measure, but a negative/minus sign does not
precede the number in the display. Because the displayed number represents a
negative value, higher/increasing numbers represent lower/decreasing
received signal strengths.
Values lower than -110 (125 for example) indicate a possible antenna
problem, or radio operation in a fringe or no-coverage area.
Higher RSSI values, -85 for example (displayed 85), with CBSER values
greater than zero (0) generally indicate RF interference is being induced into
the receiver or radio’s antenna system along with the received signal.
It is not uncommon for an OpenSky signal with low RSSI and degraded
CBSER to be decoded by the radio and heard at the speaker without any
problem.
3.17.4 Control Block Symbol Error Rate (CBSER)
The engineering display’s CBSER value indicates data distortion or
interference. Zero (0) represents no errors. When operating in RF fringe areas,
this number may increase as interference in the received data signals
increases.