In the current RPR ring network model in the subway field, a reverse dual-ring structure is adopted. What is the bandwidth of the dual-ring?

In the current RPR ring network model in the subway field, a reverse dual-ring structure is adopted. What is the bandwidth of the dual-ring?
A . 622MA
B . 1.25G
C . 2.5G
D . 10G

Answer: C

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