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Installation Guidelines HDSL2 for General Distribution Installation and Maintenance Practice
6 61223HDSL2L2-5B
Powering Options
H2TU-C
An H2TU-C module is capable of span powering an H2TU-R module by applying current to the
local loop. Current from 10 to 150 mA is coupled onto an HDSL2 span to power the H2TU-R
module when required. Figure 3 shows the HDSL2 span powering diagram.
Figure 3. HDSL2 Span Powering Diagram
H2TU-R Span Power
The H2TU-R P/N 1223026L2 receives span power from the H2TU-C.
H2TU-R Local Power
In some circumstances a locally powered remote unit is required. The H2TU-R
P/N 1223024L2 can meet those needs.
Module Installation
Follow the step-by-step procedures below to put the HDSL2 modules in service.
Total Access 3000 and 220/E220 H2TU-C Installation
To install the Total Access 3000 H2TU-C (P/N 1181113L2) or 220 H2TU-C module (P/N
1223001L2), perform the following steps:
1. Pull the ejector latch, located on the bottom of the module front panel, out from the closed
position.
2. Hold the unit by the front panel while supporting the bottom edge of the module with the
ejector latch opened to engage the enclosure edge.
3. Align the unit edges to fit in the lower and upper guide grooves for the module slot.
HDSL2
TIP (+)
RING (-)
SPAN POWER
190 V
SPAN CURRENT