第一段话：（第3页）
dedicated protection: A protection architecture that provides capacity dedicated to the protection of traffic-carrying capacity (1 + 1). See Recommendation G.803.
第二段话：（第26页）
Linear VC trail protection is a dedicated protection mechanism that can be used on any physical structure (i.e. meshed, ring, or mixed). It may be applied in any path layer in a layered network.
It is an end-to-end protection mechanism, and switches on server failures and client level information, including path performance information. It need not be used on all VCs within a multiplex section.
Linear VC trail protection switching can operate in a unidirectional or bidirectional manner. Bidirectional protection switching has the ability to carry extra traffic on the protection path.