G
LOSSARY
Glossary-10
Very high data rate Digital Subscriber Line 2 (VDSL2)
VDSL2 as defined in ITU-T Recommendation G.993.2 is an enhancement
to the first VDSL standard (G.993.1). It supports transmission at a
bi-directional net data rate (the sum of upstream and downstream rates) o f
up to 200 Mbps on twisted pair cables using a bandwidth of up to 30 MHz.
VDSL2 includes many enhancements, one of which is the addition of the
US0 band and methods to train echo cancellers and time domain
equalizers.
Virtual LAN (VLAN)
A Virtual LAN is a collection of network nodes that share the same
collision domain regardless of their physical location or connection point
in the network. A VLAN serves as a logical workgroup with no physical
barriers, and allows users to share information and resources as though
located on the same LAN.
XModem
A protocol used to transfer files between devices. Data is grouped in
128-byte blocks and error-corrected.