VT (Virtual Tributary)

In SONET standards, a bit-transparent time division multiplexed (TDM) con-

nection 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.

• ITU-R (International Telecommunication Union-Radiocommunication)
• ITU-T
• ITU-T
• ITU-T (International Telecommunication Union-Telecommunication Standardization Sector)
• IVD (Inside Vapor Deposition)
• IVDS (Interactive Video and Data Services)
• IVR (Interactive Voice Response)
• IXC (IntereXchange Carrier, or IEC)
• IXC (IntereXchange Carrier, or IEC)
• IX (Internet eXchange)
• J-1
• J-2
• J-3
• J-4
• J-5
• jabber
• Jabber
• jack
• jack
• jacket
• jailbreak
• jamming signal
• Japanese Digital Cellular (JDC)
• Japanese Total Access Communications System (JTACS)
• Java Telephony Application Programming Interface (JTAPI)