XtendLan XL-GDB101E User Manual - Chapter 2: System Overview

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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