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V.35 is a standard transfer rate implemented under recommendations by the ITU-TS (Telecommunication

Standardization Sector of the International Telecommunications Union). V.35 provides the trunk interface

between a network access device and a packet network with data rates greater than 19.2 Kbps. V.35

may use the bandwidths of several telephone circuits as a group. See also, V Series Recommendations.

Voice Activity Detection (or silence suppression) allows a device to only transmit sound when it detects it.

Variable Bit Rate Real Time is an ATM service category that provides a fixed amount of bandwidth

for high priority, but only when it is being sent. VBR-rt is best used for on-and-off (bursty) traffic.

A series of virtual paths between circuit end points. This is a logical link that behaves like a dedicated

point-to-point line.

By prior mutual agreement, each protocol is assigned to a specific virtual circuit, eg., VCI carries IP,

VC2 carries IPX, etc. VC-based multiplexing may be dominant in environments where dynamic creation

of large numbers of ATM VCs is fast and economical.

A VCI is a number that denotes a particular logical connection between end stations (users or networks).

A VCI specifies the channel and destination that ATM traffic will use. See also, VPI.zz

Very High Bit Rate DSL is an asymmetric version of DSL that is used as the final drop from a fiber

optic junction point to nearby customers. VDSL lets an apartment or office complex obtain high-bandwidth

services using existing copper wires without having to replace the infrastructure with optical fiber. Like

ADSL, VDSL can share the line with the telephone.

VID is the unique VLAN identification number.

A logical connection between ATM switches.

A bundle of virtual channels.

A VLAN allows a physical network to be partitioned into multiple logical networks. Only stations

within the same group can communicate with each other. Stations on a logical network can

belong to one or more groups.

VLAN trunking on a port allows traffic belonging to unknown VLAN groups to pass through

that port. This is useful if you want to set up VLAN groups on end devices without having to

configure the same VLAN groups on intermediary devices.

Voice and Multimedia over ATM is an ATM forum standard for sending voice and multimedia

signals across a network as ATM cells. The voice and multimedia signals are carried over AAL-2.

Voice over ATM is an ATM forum standard for sending a voice signal across a network as

ATM cells. The voice signal is carried over AAL-2.

Voice over Digital Subscriber Line is the sending of a voice signal across a network as ATM cells.

The voice signal is carried over AAL-2. This allows the combination of multiple voice/fax/modem

lines and Internet access (data) on a single DSL line. The data signal is carried over AAL-5.

A voice gateway is an interface to the telephone network for VoDSL services found between an

AAL-2 circuit and a GSTN.

Voice over Internet Protocol is the converting of the voice signal to data (IP) packets and then sending

the packets over an IP network.

A VPI is a number that denotes a bundle of virtual channels. A VPI specifies the path and destination

that ATM traffic will use. See also, VCI.

These networks use public connections (such as the Internet) to transfer information. That information is

usually encrypted for security purposes.

Point where a system can be attacked.