Appendix a - functional description, Doubler block diagram, A - f – ADC and 3 Doubler User Manual
Page 31: Ppendix, Unctional, Escription
LTPH-UM-1234-01
Appendix A - Functional Description
HDU-409 Lists 1, 2, and 3
April 30, 2003
25
A
PPENDIX
A - F
UNCTIONAL
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
. 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