User's Manual

Confidential
Chapter 3 System Structure
LTE eNB System Description v2.0 33
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Figure 16. Power Supply Configuration
The power for LMD1 and LCC4-B1As in CDU is supplied through the Power
Distribution Panel Module (PDPM) and UADB, a backboard. Each board uses the
power by converting -48 V DC provided into the power needed for each part on
the board.
Cooling Structure
CDU
The CDU maintains inside temperature of the shelf at an appropriate range using a
system cooling fans (FANM-C4), with this fan, the system can operate normally
when the outside temperature of CDU shelf changes.
The following figure shows the heat radiation structure of CDU:
L
M
D
1
L
C
C
4
L
C
C
4
L
C
C
4
F
A
N
M
-
C
4
A
CDU
PDPM
EMI Filter
-48 V DC (-40.5~-57 V DC)
Rectifier
Rectifier
R
R
H
(0)
R
R
H
(1)
R
R
H
(2)
-48 V DC (-38~-57 V DC)
UADB