NGP\00329 Rev. C 23-06-2006 Evolution Series - XPAND 35
5.7. Radio Protection Switching (RPS)
5.7.1. Specification of the protection switching system
In order to facilitate switching without introducing bit-errors, a hitless switching system is provided. The
Radio Protection Switching function is used in HSB and 1+1 Frequency Diversity configurations.
Automatic and manual switching is available. The manual switching can be hitless or forced and is
performed from the Element Manager. In Hot Standby configurations the TX- and RX- switching at a
terminal normally operates independently, but they may be configured to operate together.
5.7.2. Switching criteria and switching operation time, Rx
Alarm Switch time Configurable
EW (Early Warning) * Yes
LBER (Light degradation) * Yes
HBER (Significant degradation) 5 ms Yes
Low RF Input level 5 ms Yes
Sync loss OOF 5 ms No
Rx Alarm IFU (LOF, LOC) 5 ms No
The thresholds for the BER criteria, HBER, LBER and Early Warning (EW), are configurable.
* Depending on alarm detection time.
5.7.3. Switching criteria and switching operation time, Tx
Alarm Switch time
LIU TX Alarm 50 ms
IFU Basic Frame TX Alarm 50 ms
RIU TX Alarm 50 ms
Radio TX Alarm (ODU) 50 ms
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