Scenario: The company's private line is upgraded from OC3 to OC12, and the operator has no problem with the test line, but the interface protocol cannot be up. The operator says that they are using a non-cascading configuration, the customer router configuration is wrong, so ...
Question: In the transmission world, does cascading and non-cascading have any effect on the configuration of the user-side data communication router? What is the difference between cascading and non-cascading?
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