ADC HiGain HRU-402 User Manual page 18

Product Overview
The HRU-402 List 1 power supply converts the 90 to 200 Vdc power that is
received on the simplex pairs (or the -48V input when locally powered) to
voltage and currents required by the remote unit circuitry. The
HRU-402 List 3 power supply converts the -20 to -70 Vdc local power to
voltages and currents required by the remote unit circuitry.
The HRU-402 can be used with the HLU-232 line unit to form an automatic
1 by 1 protection switch system. Refer to the HiGain Line Unit Model
HLU-232 practice (section number: 150-232-100-xx) for more details. For
this application, the HRE-422 List 5 remote enclosure must be used. This
enclosure provides access to the HRU-402 protection switch output, on
pin 12, which controls the protection switching function.
Factory Test
20
(Do Not Use)
R
13
HDSL 1
T
7
Protection
20
Switch
Control
Protection
Switch
Power
12
-
35
Power
Local Power (a)
Supply
17
+
Circuit
Ground
S1
Ground
Local Power
Chassis
option
1
(LPWR) (b)
R1
47
HDSL 2
T1
41
(a) HRU-402 List 1 requires -48V for local power applications. HRU-402 List 3 requires -20V to -70V.
(b) HRU-402 List 1 only.
10
HDSL 1
XCVR
Framer
Loopback
S1
CLOC
TLOS
Sealing
NREM
Current
SMJK
Option
(SCURR)
HDSL 2
XCVR
Microprocessor
Figure 4. HRU-402 Block Diagram
November 5, 1998
Protection
RLEV 0
-15
Protection
HRU-402 List 1 and List 3
150-402-100-03
DS-1/
T1
5
RCV
R1
15
BRG RCV
TX
BRG
T
55
DS-1/TX
R
49