Applications; Figure 1. Hdsl2 Span Power Diagram - ADTRAN H2TU-C Installation And Maintenance Practice

Litespan H2TU-C Installation and Maintenance Practice

APPLICATIONS

The Litespan H2TU-C can be deployed in circuits consisting of one H2TU-C (line card) and one
H2TU-R (remote module). Lightning and power cross-protection is provided at each twisted
pair interface of the Litespan H2TU-C. Local power bus fusing protects the Litespan channel
bank backplane, Litespan bank power supplies, and neighboring Litespan line cards in the
event of catastrophic line card failure.
The Litespan H2TU-C uses a DC-to-DC converter to derive span powering voltage from the
Litespan –48 VDC switched battery supply. Simplex current of 30 mA may be coupled onto the
HDSL2 loop span to power the H2TU-R
ments of Class A2 voltages, as specified by Telcordia GR-1089-CORE.
The Litespan H2TU-C provides a cost-effective alternative for deploying T1 service over
metallic cable pairs. In contrast with traditional T1 service equipment, the Litespan H2TU-C
can successfully deploy over one unconditioned, non-loaded, bridged-tapped copper pair CSA
loops (Refer to "Provisioning"
Litespan HDSL2 deployment is typically made from a Litespan 2000, Litespan 2012, or
Litespan ONU channel bank assembly.
H2TU-C from a Litespan channel bank assembly.
The Litespan H2TU-C 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.
6
(Figure
HDSL2

Figure 1. HDSL2 Span Power Diagram

on page 9).
Figure 2
1). Span powering voltages meet all require-
SPAN CURRENT
TIP (+)
190V
SPAN POWER
RING (-)
shows possible deployments of the Litespan
61221002L1-5F