User Manual DEV 2190
Copyright DEV Systemtechnik GmbH 2009-2017 39
and the backup (amplifier module) channel is not used-, the RF level status of the
main and of the backup channel is continuously monitored.
If -in normal operation- the RF level of the main channel falls below the defined
RF threshold level and if the RF level of the backup channel is above the defined
RF threshold level, the device operates the corresponding redundancy switch, thus
the transmission of the signal is realized via the backup channel.
Without Option 22, there will be no automatic switching back to the main channel,
i.e. the switching is to be done explicitly in Local Mode or in Remote Mode.
If Option 22 (main backup swap) is installed, the autonomous switching works in
both directions in the same manner as the switching from the main channel to the
backup channel. This means, that the device remains switched to the backup
channel unless the RF level falls below the defined RF threshold level on the backup
channel, and if the RF level on the corresponding main channel is above the
threshold level.
For the autonomous switching capability has to be considered in addition, whether
and which port -thus the corresponding RF level monitoring functionality- is
enabled or disabled (chapters 5.4.4.2 & 5.5.4.3.9.2), since this has an influence on
the switching behavior: Therefore, the following scenarios are to be examined for
the autonomous switching functionality:
Switching from the main channel to the backup channel:
If the main channel and the backup channel of a redundancy unit are enabled,
the switching is performed as described above. I.e. the device switches only if
the RF level on the main channel falls below the defined RF threshold level and
if the RF level on the related backup channel is above the threshold level.
If the main channel is disabled, the RF level information is ignored as a trigger;
i.e. the device does not switch to the backup channel.
If the backup channel is disabled, the RF level check is omitted. Thus, if the
redundancy unit is switched to the (enabled) main channel (normal operation)
and if on the main channel the RF level drops below the RF threshold level, the
redundancy unit is switched unconditionally to the backup channel.
With Option 22: Switching from the backup to the main channel:
If the main channel and the backup channel of a redundancy unit are enabled,
the switching is performed as described above. I.e. the device switches only if
the RF level on the backup channel falls below the RF threshold level and if the
RF level on the related main channel is above the RF threshold level.
If the main channel is disabled, the RF level check is omitted. Thus, if the
redundancy unit is switched to the (enabled) backup channel and if the RF level
on the backup channel drops below the defined RF threshold level, the
redundancy unit is switched unconditionally to the main channel.
If the backup channel is disabled, the RF level information is ignored as a
trigger; i.e. the device does not switch to the main channel.
5.2 Initialization of the Device
The device performs a health check and a configuration check during power-up and
after a device reset. This takes about 60 seconds; there is no manual configuration
necessary, all settings (including the operation mode) after power-up or after a
reset remain unchanged.
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