XtendLan XL-GDB101V, User Manual

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XtendLan XL-GDB series User’s Guide
Chapter 2: System Overview
2.1 General
The following section describes the XL-GDB access system, DSL transmission, performance
monitoring, and configuration, alarm management, diagnostics and common applications.
2.2 System Description
The typical XL-GDB SHDSL access system consists of a XL-GDB at the customer site interfacing
with a XL-GDB line card at the central office over a Symmetric Digital Subscriber Line
transmission line. The system transmits data symmetrically, at the same rate in both directions,
over one pair of copper wires. XL-GDB allows existing and new telephone companies to
expeditiously and economically providing this high-speed access to their customers. In order to
satisfy increasing demand for high data rate services, XL-GDB provides transmission over a
single copper pair more than doubling the transmission capacity of the existing copper plant. The
XL-GDB single-pair SHDSL access system maximizes network performance and provisioning
flexibility by providing automatic rate/reach adjustment at the various symmetric data rates (see
chart 1). XL-GDB is configured and managed locally via a VT-100 type Terminal connected to the
unit through the CID port on the rear of the unit. It can also be configured and managed remotely
via a terminal connected to the far-end XL-GDB.
2.3 SHDSL Transmission
Today’s bandwidth-hungry applications such as Internet access, remote LAN access,
teleconferencing, workgroup and data sharing, telecommuting and numerous varieties of digital
video services are driving today’s demand for high-speed data network access. These content rich
applications have put extraordinary stress on that vital connection between the customer and the
first network node… the local loop. To address this need for higher bandwidth and to minimize the
bottleneck at the local loop, the telecommunications industry has developed a set of new
technologies, the most significant of which is Digital Subscriber Line (DSL) transmission. Many
types of DSL have been developed for various applications. XtendLan SHDSL address both the
need for higher bandwidth and the efficient use of existing copper by combining the latest SHDSL
technology to transmit and receive traffic from 64kbps to 2.304 Mb/s and up to 6,300 meters while
using only one-pair of 24 AWG copper wire. Because only one pair of copper wire is needed with
SHDSL technology, the capacity of the local loop infrastructure is enhanced dramatically. The
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