SMC Networks SMC7500A/VCP VDSL Technology

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)

CentralOffice

(PSTN)

PunchDown

Blocks/

PatchPanels

PBX

Telephone/Fax

Telephone

VDSLCPE

VDSL

Concentrators Ethernet

Switch

ES3526F

TelephoneLine from Central Office

FiberOptic Link to ISP

LocalServers

(LocallyHosted Services,

VideoServers, Billing)

ExistingPhone

Linesto Clients

Multi-dwelling/Multi-tenantBuilding

Floor2

Floor1

Rooms/Clients

VDSLLines

PhoneLines

Ethernet

Linksto Switch