Can anyone explain the alarm propagation in OTN in 3 node setup > i.e A--B--C--D and if TX to RX fiber is cut in between B and C.
In this case how alarm propagation will happen? What alarms
will i see on OTU ODU OPU layers in all three nodes?
Hello Harsh
You ask:
Can anyone explain the alarm propagation in OTN in 3 node setup > i.e A--B--C--D and if TX to RX fiber is cut in between B and C.
In this case how alarm propagation will happen? What alarms
will i see on OTU ODU OPU layers in all three nodes?
I have extended the link a little to make it more general.
In the forward direction (node A to node D):
Note C will report signal fail (SF) on the received OTUk
Node D will report server signal fail (SSF) on the ODUk used for
the test signal. Output of node D is AIS.
In the backward direction (node D to node A)
Node B may report remote defect (RDI) on OTUk.
Node A may report remote defect (RDI) on ODUk used for test.
Test signal sent from node D ot node A is not affected.
Best regards, Huub.
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On Tuesday, April 10, 2018 at 3:41:10 PM UTC+5:30, Huub van Helvoort wrote:
Hello Harsh
You ask:
Can anyone explain the alarm propagation in OTN in 3 node setup > i.e A--B--C--D and if TX to RX fiber is cut in between B and C.
In this case how alarm propagation will happen? What alarms
will i see on OTU ODU OPU layers in all three nodes?
I have extended the link a little to make it more general.
In the forward direction (node A to node D):
Note C will report signal fail (SF) on the received OTUk
Node D will report server signal fail (SSF) on the ODUk used for
the test signal. Output of node D is AIS.
In the backward direction (node D to node A)
Node B may report remote defect (RDI) on OTUk.
Node A may report remote defect (RDI) on ODUk used for test.
Test signal sent from node D ot node A is not affected.
Best regards, Huub.
----------------------------
Hi Hubb,
I hope in Upstream direction (D->A) OTN gets BDI instead of RDI (used at SDH/SONET).
Regards,
Senthil
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