R&S EU4200C
Simultaneous Transmission Detection (Optional)
6174.8456.02-01
3.106
3.15
Simultaneous Transmission Detection (Optional)
Sim ul Trans Detectio n\ Sim ul Trans Detection "Rad io".d oc
Introduction
Operational experience has shown that simultaneous transmissions by
pilots and air-traffic controllers can stay undetected, with severe
implications on the safety of air-traffic. Rohde&Schwarz has developed a
sophisticated approach to detect cases where two transmissions overlap in
time. Receiver modules support detection of both simultaneous
transmissions of two pilots and simultaneous transmissions of the pilots and
controllers. The implementation of simultaneous transmission detection on
the R&S receiver modules covers the SHOULD requirements of Case 1,
Case 2, Case 3b, and Case 4, specified inside Section 2.5 of the ED136.
Enabling STD
Using Simultaneous Transmission Detection requires to install a valid option
key "Simultaneous Transmission Detection" and to explicitly enable the
functionality via the "STD Enabled" parameter. The STD feature is only
available for the AM mode, and can be used with "Audio Interface" set to
"Analog", "VoIP", or "E1".
STD CCIR Threshold
It is recommended to use the default value of 20 dB. If configured to small
values (e.g. 5 dB), then less simultaneous transmission events will be
detected, i.e. only those events where the power level of the two
simultaneously received signals is in the same magnitude.
STD Outer Band
Check
This parameter should be only enabled if the device is operating in a multi-
carrier offset operation environment (CLIMAX), i.e. if it (permanently)
receives a signal at a Climax offset (from a ground station). Generally, all
modes for multi-carrier offset operation and channel spacing (8.33 and 25
kHz) are supported. However, the performance detection can slightly
degrade if a mode with a Climax offset of 0 kHz is deployed (3- and 5-
carrier Climax) and the respective ground station with 0 kHz offset is
actually received at the radio.
STD Overlap Time
Threshold
This parameter defines the minimum overlap time of a simultaneous
transmission necessary to generate an STD event.
The overlap time threshold can be set to 800 ms, 1200 ms, 1600 ms and
2000 ms. The default value is 800 ms.
The user has the possibility to increase the overlap time threshold, to adapt
the function to every operational condition.
Signalling of
STD events
Detected simultaneous transmission events are signalled via the following
channels:
Inband tone: Configurable via parameter "SQ/RSSI Signalling" and
"STD Inband Signalling Frequency" in Analog mode, VoIP mode, and
E1-mode
If VoIP is used: Inband signalling via SCT bit, see ED137B-1
If E1 is used: Channel Associated Signalling (CAS) bit sequence 1110
User Out Port: Configurable via parameter "STD User Out Enabled"
Irrespective of the used signalling channel, the simultaneous transmission
will be signalled as long as the event lasts.
History of occurred
STD events
The history of occurred simultaneous transmission events can be tracked in
the event list. In addition, the parameter "STD Event Counter" counts the
number of occurred events since the last radio reboot and can be queried
via SNMP or GB2PP.
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