Westermo LR-11 - Manual (Page 11)

11 6608-2211
The receiver Rx1 on the ring master unit detects a break on Link 1.
Alarm CH1 is asserted on the ring master unit.
The receiver Rx1 on the rightmost LR-11 unit detects a break on Link 1.
Alarm CH1 is asserted on both local unit and the ring master unit.
Link 1
Link 2
LR-11
CH1
CH2
LR-11
CH1
CH2
LR-11
CH1
CH2
CH1
CH2
LR-11
Ringmaster
x
Link 1
Link 2
LR-11
CH1
CH2
LR-11
CH1
CH2
LR-11
CH1
CH2
CH1
CH2
LR-11
Ringmaster
x
Below are some examples of LR-11 alarm indications when a fault is detected on the
fibre link. The break is indicated with a X and an asserted alarm output with a filled
circle. The faults showed in these examples are recovered by the built-in redundancy
scheme within 4 ms. An alarm will remain asserted until the fault is repaired, i.e. when
communication on both fibre links operates normally.