IF Both GSCC boards fail and at the same time Optical Fiber cut b/w Two Nodes, so then 2FMSP protection switching occurred or not
NG-SDH protection switching has a feature its protection switching depend on Cross connect both not on Communication board.
Third test was conducted is that?
Pull out the working cross connect board and test the protection switching it will also occurred successfully.
I have configured the 2FMSP ring of 4 NE (OSN-7500) in Lab and conduct the test.
1) First I have pull out working GSCC board from NE, and then I have pull out working Fiber b/w NE-A and NE-B. Protection switching occurred successfully.
In second case
2) Both GSCC pull out from NE and then break the Fiber b/w NE-A and NE-B.
So found that protection switching is still occurred successfully.
NG-SDH product MSP switching depend on cross connect board.