SMC Networks VDSL2 manual Vdsl Technology, Vdsl Application

OVERVIEW

VDSL Technology

VDSL2 (Very High Bit-Rate Digital Subscriber Line) is at the high-end of all the DSL technologies, offering the best combination of fiber optic 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 an Internet Service Provider to the building; then the installed telephone copper wires take the data and deliver it to individual units within that building.

	Telephone
	Rooms/Clients
	VDSL CPE
	Floor 2
	Telephone/Fax
	Rooms/Clients
Existing Phone	VDSL CPE
	Floor 1
Lines to Clients

			Local Servers
			(Locally Hosted Services,
Punch Down			Video Servers, Billing)
Blocks /		VDSL Switch
Patch Panels	VDSL Lines
			MPOE
				Telephone Line
		Phone Lines
				from Central Office	Central Office
					(PSTN)
			PBX
			Fiber Optic Link to ISP
					ISP
		Multi-dwelling/Multi-tenant Building			(Internet)

Figure 1-1 VDSL Application

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 as 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.

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