EXFO VDSL2 - Manual (Page 10)

Introducing the VDSL2, ADSL2+, and IP Triple-Play Test Set
4 AXS-200/630
VDSL2 Overview
VDSL2 Overview
Very high speed digital subscriber lines (VDSL) is the newest standard that
allows extremely high speed internet access over existing copper cables.
The VDSL2 standard increases the spectrum allocation up to 30 MHz for
even higher performance than its predecessor VDSL1, and allows speeds
up to 100 Mbps symmetrical (both upstream and downstream). VDSL2 also
allows for support of applications such as multi-channel high definition TV
(HDTV), video on demand, video-conferencing, and VoIP using the existing
copper telephone line infrastructure. Along with that it also calls for ATM,
Ethernet, and IP compatibility, as well as multimode implementations to
permit interoperability with existing ADSL equipment.
VDSL2 gives carriers the flexibility to start rapidly deploying VDSL2
networks and offer new broadband services including triple-play services,
HDTV, VoD, high-speed data, VoIP, high-speed Internet access, video
conferencing, virtual private networks (VPNs), PBX Extension, and video
surveillance to compete with cable companies. VDSL2’s broader spectrum
combined with features like Trellis coding and multi-pair bonding allows
carriers to offer full triple-play services to a large portion of their customer
base.
The typical environment for VDSL2 consists of a VTU-C (VDSL Transceiver
Unit - Central Office) that resides in a DSLAM in the Local Exchange. At the
customer premises, there is a VTU-R (VDSL Transceiver Unit - Remote) that
interfaces with a user's computer.
The VDSL2, ADSL2+, and IP Triple-Play Test Set allows a user to emulate
the VTU-R (customer's VDSL modem). Once a connection is established
with the VTU-C in the DSLAM at the service provider's central office or
remote DLC, the AXS-200/630 displays the connection rates for the
upstream and downstream directions of the VDSL2 link.