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LTPH-UM-1234-01 Appendix A - Functional Description
HDU-409 Lists 1, 2, and 3 April 30, 2003 25
APPENDIX A - FUNCTIONAL
D
ESCRIPTION
HiGain uses the ADC Two-Binary, One-Quaternary (2B1Q) HDSL
transceiver system to establish two full-duplex 784 kbps data channels
between the HLU, HDU, and HRU units. Each HDU-409 increases the
maximum range by approximately 12,000 feet (3.7 km) using 24 AWG or
9,000 feet (2.75 km) using 26 AWG per doubler. See Table 2 on page 3 for
deployment rules.
A block diagram of the HDU-409 with pinouts is shown in Figure 7 on
page 25. The doubler unit power supply uses the HDSL simplified line
voltage to produce +5 Vdc and +3 Vdc required by the HDU-409 electronics.
The power feed is passed on to the HDSL output pair to power a second
doubler or a remote unit.
The typical power dissipation of the doubler unit is 3W.
Figure 7. Doubler Block Diagram
Power
Supply
and
GFD
3 Ring
4 Tip
HDSL 1
OUT
11 Ring
12 Tip
Tip 6
Tip 9
Ring 5
Ring 8
HDSL 1 IN
HDSL 2 IN
HDSL 2 OUT
80 to 200 V
-
+
+3 V
+5 V
475 K
Output
Span
Voltage
Control
Microprocessor
Status
Loop 1
CO Field
Loop 2
1
10
Frame
Ground
HDSL
IN
XCVRS
HDSL
OUT
XCVRS
H0083-A