Virtual concatenation (VCAT) is an inverse multiplexing technique creating a large capacity payload container distributed over multiple smaller capacity TDM signals. These signals may be transported or routed independently. Virtual concatenation has been defined for SONET/SDH, OTN and PDH path signals.
Alternate SONET/SDH concatenation techniques are contiguous concatenation and arbitrary concatenation.
Read more about Virtual Concatenation: Variable Bit Data Streaming, Virtual Concatenation Group, Differential Delay
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