SMC Networks SMC7500A/VCP - Manual (Page 15)

VDSL T
ECHNOLOGY
3
VDSL Technology
VDSL (Very High Bit-Rate Digital Subscriber Line) is at the high-end of
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 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.
VDSL provides high-speed Internet access over existing phone lines by
making use of previously unused frequency bandwidth above the voice
band. 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.
ISP
(Internet)
Central Office
(PSTN)
Punch Down
Blocks /
Patch Panels
PBX
Telephone/Fax
Telephone
VDSL CPE
VDSL CPE
VDSL
Concentrators
Ethernet
Switch
1 ES3526F 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