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For the new generation MSTP device, applying LCAS is the extension of VC technology, which allowed the adjustment of link capacity hitless in transmission network without any break to incurrent service or reserved bandwidth resource. The article introduces the operation mechanism of LCAS in SDH/SONET network and point out that even though LCAS really brings us much more advantages in SDH transmission network, it also brings some drawback to us. The paper mainly analysis the time delay problem of SDH network that introduced by LCAS according to the related protocols for LCAS and practical system application. The time delay derives from the LCAS technology itself could take for the necessary cost of flexibility and control [1] ]. The most practical contribution of the adjustment delay results is in the link delay determination. This knowledge of link delays, at best only loosely estimated today, provides the critical support for rolling out next-generation applications over the transport infrastructure.

The Impact of LCAS Dynamic Bandwidth Adjustment on SDH/SONET Network