Short for virtual path identifier, an eight-bit field in an ATM cell��s header that identifies the virtual path (a bundle of virtual channels that have the same endpoint) to which the cell belongs as it travels through an ATM network.
Acronym for Virtual Private Dial-up Network. A network that extends remote access to a private network using a shared infrastructure. VPDNs use Layer 2 tunnel technologies (L2F, L2TP, and PPTP) to extend the Layer 2 and higher parts of the network connection from a remote user across an ISP network to a private network. VPDNs […]
Short for Voice Profile for Internet Mail, a method for encoding voice mail messages as data, enabling travel via the SMTP mail protocol over IP networks. VPIM uses MIME to encode messages in multiple parts, which are decoded by VPIM-compliant voice mail systems at the receiving end.
Short for vertical redundancy check it is a method of error checking that attaches a parity bit to each byte of data to be transmitted,which is then tested to determine if the transmission is correct. This method is considered to be somewhat unreliable. If an odd number of bits are distorted, the check will not […]
Short for video RAM, and pronounced vee-ram. VRAM is special-purpose memory used by video adapters. Unlike conventional RAM, VRAM can be accessed by two different devices simultaneously. This enables the RAMDAC to access the VRAM for screen updates at the same time that the video processor provides new data. VRAM yields better graphics performance but […]
Short for voltage regulator module, a small module that installs on a motherboard to regulate the voltage fed to the microprocessor. Nearly all motherboards have either a built-in voltage regulator or a VRM, the only difference being that the VRM is replaceable.