Consider the two-fiber bidirectional line switched ring (2F-BLSR) shown in Figure 1.

1.what is the total available capacity of the ring for the transmission of the working traffic from ADM 1 to ADM 2 when A communicates with B

2.When all fibers are working

3.When fibers 2 and 8 fail

4.When fiber 12 fails after fibers 2 and 8 have failed

Assume that the capacity of each fiber is OC-12/STM-4

ADM 1 ADM 2 ADM 3 2 A B 7 8 AL 6 12 3 10 ADM 6 ADM 4 5 ADM 5 Figure 1: 2F-BLSR ring ADM 1 ADM 2 ADM 3 2 A B 7 8 AL 6 12 3 10 ADM 6 ADM 4 5 ADM 5 Figure 1: 2F-BLSR ring