User Manual DEV 1951
Copyright DEV Systemtechnik GmbH 2004-2017 39
ity becomes "Fail", respectively) and if on both primary input ports the
RF level is above the RF threshold level (the digital signal quality is "OK" on
both primary input ports, respectively).
- If one (or both) primary input port(s) is (are) disabled, the RF level infor-
mation (the digital signal quality information, respectively) of the port(s) is
omitted. Thus, disabling one (or both) primary input port(s) encourages the
switching in this situation, since the signal information of the primary input
port(s) is ignored.
- If one secondary input port is disabled, this port is not considered in the
switching decision, i.e. the device switches if on the enabled secondary in-
put port the RF level drops below the RF threshold level (the digital signal
quality becomes "Fail", respectively).
There is no autonomous switching if both secondary input ports are
disabled.
With (activated) Option 28:
Switching back from the secondary input port to the primary input port in
Individual switching mode:
- If both input ports of a sensing switch module (digital signal switch module)
are enabled, the switching is performed as described above.
I.e. the device switches, if on the primary input port the RF level is above
the RF threshold level again (the digital signal quality is "OK" again,
respectively) plus an offset value (chapter 5.5.7.3.2).
- If the primary input port of a sensing switch module (digital signal switch
module) is disabled, the RF level check (and the digital signal quality check,
respectively) of this port is omitted. Thus, the device unconditionally
switches to the primary input port.
- The secondary input port is not considered in the switching decision in this
scenario. Therefore, it does not matter whether the secondary input port is
disabled or enabled.
With (activated) Option 28:
Switching back from the secondary input ports to the primary input ports in
Simultaneous switching mode
(with two sensing switch modules (digital signal switch modules) installed):
- If all input ports are enabled, autonomous switching is performed for both
channels from the secondary input ports to the primary input ports.
The condition is that on both primary input ports the RF level is above the
RF threshold level again (and the digital signal quality is "OK" again,
respectively) plus the offset value (chapter 5.5.7.3.2).
- If one (or both) primary input port(s) is (are) disabled, the RF level infor-
mation (the digital signal quality information, respectively) of the port(s) is
omitted. Thus, disabling one (or both) primary input port(s) encourages the
switching in this situation, since the signal information of this (these)
primary input port(s) is ignored.
- The secondary input port(s) is (are) not considered in the switching decision
in this scenario; i.e. it does not matter whether the secondary input port(s)
is (are) disabled or enabled.
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