Applications; Figure 3. Deployments From A Litespan Cba - ADTRAN HTU-C NB Installation And Maintenance Practice

APPLICATIONS

The ADTRAN HDSL system provides a cost-effective alternative for deploying T1 service over
metallic cable pairs. In contrast with traditional T1 service equipment, ADTRAN HDSL can be
successfully deployed over two unconditioned, non-loaded, bridged-tapped copper pair CSA
loops (refer to "HDSL Deployment Guidelines"
Litespan HDSL deployment is typically made from a Litespan 2000, Litespan 2012, or
Litespan ONU channel bank assembly.
from a Litespan channel bank assembly.
ADTRAN HDSL systems can be deployed quickly without the use of expensive T1 repeater
equipment on standard CSA loops while using the existing massive copper-fed twisted line
pairs in use by the industry.
ADTRAN uses negative ground-referenced span powering voltage (–137 VDC) on HDSL loop 2
while loop 1 remains at ground. This prevents corrosion associated with positive ground
reference voltage while providing power for the HTU-R. HTU-R span powering can be disabled
to allow locally-powered HTU-R applications, if desired.
Litespan 2000 or 2010 System with Litespan HTY-C deployment
Common
Control
Channel Bank
Assembly with
a Litespan
HTU-C
installed
Typical Starspan System
HDT
Common
Control
High-Density
Fiber Bank
If normal CSA loops need expanding beyond the maximum range of an HTU-C/HTU-R HDSL
system, a span-powered HRE can be added to effectively double the HDSL serving area.
Addition of a span-powered HRE still allows span powering to be passed through to a span-
powered HTU-R, providing a totally span-powered HDSL system. However, addition of an HRE
adds to the total power consumption from the Litespan channel bank assembly and requires
recalculation of the power budget deployment guidelines (refer to
lines" on page 27). HRE deployment may limit total Litespan line card deployment.
61247002L1-5A
Figure 3
HDSL Loop Pairs
ONU-96 with
OLNK
Litespan HTU-C
installed

Figure 3. Deployments from a Litespan CBA

on page 27).
shows possible ADTRAN HDSL deployments
HDSL Unit
Remote End
HDSL Loop Pairs
Applications
HDSL Unit
Remote End
"HDSL Deployment Guide-
7