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TECHNICAL APPENDIX
| TECHNICAL APPENDIX 174
The traps will be sent in the instant the alarm rises up, but Left/Right and the time in the var-binds will be related to the
first sample out of the range.
Under the alarm condition the MPX alarm led on the panel must be on (flashing if the alarms are more than one on the
channel list) and clicking on the channel number of the correspondent tuner the MPX error will be displayed.
In case of more errors on the related channel, they will rotate for about 30 seconds in a sequence carousel.
In SmartScan Mode the behavior expected is the same of the normal Scanning mode because this parameter is
continuous and always available on the channel.
REPLAY ENABLED TRAPS
The LEFT/RIGHT audio silence alarm trap are replayed with their original status, time and value. Trap Counter is
normally incremented.
All data and parameters are available in the MIB L3-5 to set and test this configuration.
NOTES
After some problems found in the release 0.62 (levels alignment , peaks in the separation, requests to set silence
threshold as lower as possible) we have modified some things.
1) The source silence alarm signal is now the RMS value in place of the PEAK (this choice allows to gain 3-5 dB in the
absolute level of the threshold). The average RMS signal in the muted channel is about -50 dBr (TDF reference) or -
38dBr (MB reference)
2) Modified the attack time (now slower) of the audio measurement in the level zone from -50dBr to -30dBr to filter
separation peaks in some situations. This modification allows even to stabilize the muted channel separation, slightly
increasing the max measured separation. The behavior in the nominal level zone (-20dBr to +10dBr) is exactly the
same. This solution filters an unexpected receiver behavior in the particular case of high channel level unbalance (one
channel muted) and dynamic changes from very low to high levels. This seems to depend by a dynamic module (stereo
blend engine) that continues to act on the separation even in disabled mode. We are asking to Silicon Labs to find a
solution even on the receiver audio signal.