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YOUNGWOO TELECOM Network Development Team
Chapter 1 Introduction
VDSL : Very High-bit rate Digital Subscriber Line
Through this technology, an operator offers multi-megabyte service to subscribers by existing copper-fiber
infrastructure, and current VDSL modem provides the following according to the length of lines and modem
configuration.
Symmetric
Asymmetric
Upload
10~13Mbps
13Mbps
Speed
Download
10~13Mbps
52Mbps
Transmission Distance
0~1.5Km
0~4.5Km
<Table 1> YC-201 VDSL Modem Speed and Transmission Distance
Further, it is so designed as to enable optimum service within transmission distance of 1.2Km via telephone
line, and VDSL was configured in hybrid. It uses fiber from central office (switch) to street curb or
ONU(Optical Network Unit) of apartment and building, and utilizes existing telephone line to the extent of
indoor subscriber device.
<Figure 1> VDSL Service Network Configuration Diagram
