VCAT (Virtual Concatenation)

VCAT is specified by ITU-T G.707 and enables end-to-end connections that precisely match the client requirements without wasting bandwidth. High-order VCAT provides a 52Mb/s (STS-1) or 155Mb/s (AU-4) resolution.
Low-order VCAT provides a 1.5Mb/s (VT 1.5) or 2Mb/s (VC-12) resolution. VCG members need not be in adjacent channels and can take different paths through the network, so ingress and egress elements must be able to tolerate up to 256 ms of differential delay between VCG members.

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