vt

In SONET standards, a bit-transparent time division multiplexed (TDM) connection that carries one form of signal (e.g., DS-1, DS-2, or DS-3) within a byte-interleaved frame.VTs are sized to accommodate the originating signal. A VT1.5, for example, operates at 1.544 Mbps (T1),VT2 at 2.048 Mbps (E-1),VT3 at 3.152 Mbps (T1C), and VT6 at 6.312 Mbps (T2). Individual VTs are distinguished by the use of a pointer, which identifies the position of the VT within a Virtual Tributary Group (VTG). A Tributary Unit (TU) is a VT, along with a pointer. SDH specifications refer to a VT as a Virtual Container (VC). See also bit transparent, DS-1, DS-2, DS-3, SDH, SONET, TDM, TU, and VTG.