Radio Protection Switching (Rps); Specification Of The Protection Switching System; Switching Criteria And Switching Operation Time, Rx; Switching Criteria And Switching Operation Time, Tx - Nera Evolution Series Technical Description

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
EW (Early Warning)
LBER (Light degradation)
HBER (Significant degradation)
Low RF Input level
Sync loss OOF
Rx Alarm IFU (LOF, LOC)
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
LIU TX Alarm
IFU Basic Frame TX Alarm
RIU TX Alarm
Radio TX Alarm (ODU)
NGP\00329 Rev. C 23-06-2006
Switch time
*
*
5 ms
5 ms
5 ms
5 ms
Switch time
50 ms
50 ms
50 ms
50 ms
Evolution Series - XPAND
Configurable
Yes
Yes
Yes
Yes
No
No
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