2.3. Operating modes
•
Auto
– primary active is RipEX2 “A”, when it fails, controller automatically switches-over to RipEX2
“B”. When both units are with alarms, “A” unit remains active.
•
A
– only RipEX2 “A” is active and controller will never switch to RipEX2 “B”
•
B
– only RipEX2 “B” is active and controller will never switch to RipEX2 “A”
A
and
B
modes are supposed to be used only for the maintenance/testing and not for normal service.
2.4. Switching over
In order to achieve maximum reliability, the controller is software free. Switching-over is based only on
HW alarm outputs of RipEX2 units and the HW signals from their power supplies.
The HW alarm of active RipEX2 or its power supply will cause the immediate and unconditional switch-
over to hot standby RipEX2. If there are any packets waiting in queues of RipEX2 which becomes in-
active, these packets are discarded after switch-over.
2.4.1. Power alarm
Power supply of respective unit is “Off” when the input voltage from the respective power supply to the
controller is out of voltage working range.
Some borderline examples for Auto mode (Primary unit is always “A”. The second unit is standby):
1. Power alarm of Primary unit is “On”
- Standby unit becomes active
2. Primary unit alarm is “On” and Power alarm of Standby is “On” or Standby unit alarm is “On”
- Nothing will be done. Primary unit remains active
3. Primary unit alarm is “On”, it was switched to Standby unit, Primary unit alarm disappeared
- it will be switched back to Primary unit immediately (the protective timeout of 30 s will be held for
shorter HW alarm output changes)
2.5. HW alarms
In order to achieve maximum reliability, the controller is software free. Switch-over is based only on
HW alarm outputs of RipEX2 units and their power supplies.
9
© RACOM s.r.o. – RipEX2-HS
RipEX2-HS in detail
Содержание RipEX2-HS
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