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Behaviour under faulty condition
Elapsed time from any kind of failure at the fibre optic network until data exchange after
a corrective action depends on total length of fibre ring. This is typically 10–20 ms.
During that time, the transferred data frames should be seen as corrupted or missed.
Failure
Indications
Fibre interruption ring A, TX
On: FL R
Fibre interruption ring A, RX
On: FL L
Fibre interruption ring A, RX & TX
On FL L
Fibre interruption ring B, TX
On: FL R
Fibre interruption ring B, RX
On: FL L
Fibre interruption ring B, RX & TX
On: FL L
Fibre interruption ring A and B
(e.g. CH1 or CH2 both TX & RX)
On: FL L &/
or FL R
* Regarding functionality see chapter “multi drop application”
Recovery from faulty status
LRW-112 will automatically recover to the previous operating status when a failure
disappears. This involves recovery from bus/multi drop network to Redundant ring A/B
when ring is up and running and recovery from Ring B to Redundant ring A when the
ring is up and running. The time to recover from the failure status depends on total
length of fibre ring. This is typically 10–20 ms. During that time the transferred data
frames should be seen as corrupted or missed.
