I have another question which is based on a real experience.
In a chain topology of bts sites,
the hub site went down but the dependant site was working .
At hub sites we had Rx level of -100 which is so bad and at dependasnt site we had -60 !!
finally we guessed maybe the odu is faulty. so we replaced them at both ends and reallighned the dishes.
How can it be possible?