A SONET transmission system can be configured in two different ways to protect against a path failure (protection switching). What are the names of the two network configurations?
a) Linear Automatic Protection Switching. This involves 4 fibers: 2 working fibers in each direction, and two protection fibers.
b) Unidirectional Path Switched Ring (UPSR): In a UPSR, two redundant (path-level) copies of protected traffic are ...