VT
(1) (Virtualization Technology) The virtual machine capability in Intel's CPU chips. The VT circuits added virtual machine instructions to the x86 and Itanium families of CPUs. Introduced in 2004, the specific names are VT-x for the x86 and VT-i for the Itanium. The VT circuits in the CPU eliminate the need to paravirtualize (modify) the guest operating system to achieve maximum performance.VT enables the virtual machine monitor (VMM) to run at the most privileged level, and it accelerates transitions between the VMM and guest OS. It traps the calls to the hardware from the guest operating system, saves the CPU state and restores it after the VMM handles the event.
VT for Directed I/O (VT-d)
Introduced in 2008, VT for Directed I/O (VT-d) enables direct memory access (DMA) transfers between devices and guest OS memory without using the VMM as an interim stage. This allows network and display adapters to be assigned to specific virtual machines for increased performance. For example, a second display adapter can be assigned to a VM running a CAD application, which must address the hardware directly, or a second network adapter can be assigned to a VM running a high-priority network application. See virtual machine and hardware virtualization.
(2) See Video Toaster.
(3) (Virtual Tributary) In SONET, a sub STS-1 rate, which is below 52 Mbps. A VT allows SONET to multiplex lower-capacity channels down to 64 Kbps, an important characteristic because SONET is used both as a carrier infrastructure and a customer-premises based service. A VT can operate at four speeds: 1.728 Mbps, 2.304 Mbps, 3.456 Mbps and 6.912 Mbps. A mixture of different capacity VTs can be combined into a VT Group and carried in a single STS-1. See OC.
| (character) | VT - Vertical Tab, the mnemonic for ASCII 11. |
Vermont State Information
Phone: (802) 828-1110
www.vermont.gov
Area (sq mi): 9614.26 (land 9249.56; water 364.70). Pop per sq mi: 67.40.
Pop 2005: 623,050. State rank: 0. Pop change: 2000-20005 2.30%; 1990-2000 8.20%. Pop 2000: 608,827 (White 96.20%; Black or African American 0.50%; Hispanic or Latino 0.90%; Asian 0.90%; Other 1.80%). Foreign born: 3.80%. Median age: 37.70.
Income 2000: per capita $20,625; median household $40,856; Pop below poverty level: 9.40%. *Personal per capita income 2000-2003: $27,680-$30,888.
Unemployment 2004: 3.70%. Change from 2000: 1.00%. Median travel time to work: 21.60 minutes. Working outside county of residence: 21.50%.
www.vermont.gov
Area (sq mi): 9614.26 (land 9249.56; water 364.70). Pop per sq mi: 67.40.
Pop 2005: 623,050. State rank: 0. Pop change: 2000-20005 2.30%; 1990-2000 8.20%. Pop 2000: 608,827 (White 96.20%; Black or African American 0.50%; Hispanic or Latino 0.90%; Asian 0.90%; Other 1.80%). Foreign born: 3.80%. Median age: 37.70.
Income 2000: per capita $20,625; median household $40,856; Pop below poverty level: 9.40%. *Personal per capita income 2000-2003: $27,680-$30,888.
Unemployment 2004: 3.70%. Change from 2000: 1.00%. Median travel time to work: 21.60 minutes. Working outside county of residence: 21.50%.
List of Vermont counties:
Vermont Parks
- US National Parks
- State Parks
- National Wildlife Refuges
- National Forests
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