VDSL TECHNOLOGY
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.
Existing Phone Lines to Clients
Punch Down
Blocks /
Patch Panels
| Telephone |
| Rooms/Clients |
| VDSL CPE |
Floor 2 | |
| Telephone/Fax |
| Rooms/Clients |
Floor 1 | VDSL CPE |
|
| | Local Servers | |
VDSL | | (Locally Hosted Services, | |
Ethernet | Video Servers, Billing) | |
Concentrators | |
Switch | | |
VDSL Lines | | |
| | |
| | | ISP |
Phone Lines | | Fiber Optic Link to ISP | (Internet) |
Ethernet
Links to Switch
PBX
Telephone Line from Central Office | Central Offi |
| | |
| | | (PSTN) |
Multi-dwelling/Multi-tenant 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
