Switch User Manual

VDSL T ECHNOLOGY
1-3
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
ISP
(Internet)
Central Offi
(PSTN)
Punch Down
Blocks /
Patch Panels
PBX
Telephone/Fax
Telephone
VDSL CPE
VDSL CPE
VDSL
Concentrators
Ethernet
Switch
1
E
S
3
5
2
6
F
ES3526F
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