User's Manual

Introduction
14
1
VDSL Technology
VDSL (Very High Bit-Rate Digital Subscriber Line) is at the high-end of all the DSL
technologies, offering the best combination of fiber optics and copper to provide
high-speed broadband Internet access. VDSL’s primary application is in providing a
broadband data service to multi-tenant residential or commercial buildings. In this
implementation, fiber optic cable carries the data from a telephone company’s central
office to the building; then the installed telephone copper wires take the data and
deliver it to individual units within that building.
Figure 1-1 Providing Broadband Internet Access through VDSL
VDSL provides high-speed Internet access over existing phone lines by making use of
previously unused frequency bandwidth above the voice band (i.e., up to 30 MHz with
VDSL2). By placing VDSL signals above the frequency of the voice signal, a VDSL
service can coexist on the same line with other telephone services. VDSL can operate
symmetrically, providing the same data rate in both directions, or asymmetrically,
providing a higher data rate in the downstream (receive) direction than in the upstream
(transmit) direction.
VDSL delivers high-performance online applications, such as high-quality video and
other switched multimedia services. This Ethernet VDSL2 Gateway provides robust
performance, with a data rate up to 100 Mbps downstream and 100 Mbps upstream,
and a range up to 200 meters (656 ft).
This system is based on advanced VDSL2 Multi-Carrier Modulation (MCM) technology
with adaptive channel equalization that overcomes bridge taps and other line
ISP
(Internet)
Central Office
(PSTN)
Punch Down
Blocks /
Patch Panels
PBX
Telephone/Fax
Telephone
VDSL
Concentrators
Ethernet
Switch
1
E
S
3
5
2
6
F
Telephone Line from Central Office
Fiber Optic Link to ISP
Local Servers
(Locally Hosted Services,
Video Servers, Billing)
Existing Phone
Lines to Clients
Multi-dwelling/Multi-tenant Building
Floor 2
Floor 1
Rooms/Clients
Rooms/Clients
VDSL Lines
Phone Lines
Ethernet
Links to Switch
VDSL
Gateway
VDSL
Gateway