LED
Color
Status
Description
On
There is abnormal
input or output
voltage, the unit is
overheated, or the
unit is not properly
inserted.
Fault LED
Red
Off
The running status is
normal.
Blinking
The fan is faulty.
4.11.3 Power Subrack (DC/DC)
The power subrack (DC/DC) provides the power input wiring terminals, power output wiring
terminals, ALM port, and PRESENT port. The terminals and ports are used for the connections
of the +24 V input power cables, -48 V output power cables, monitoring signal cable for the
PSU, and in-position signal cable for the PSU respectively.
Exterior
shows the power subrack (DC/DC).
Figure 4-49
Power Subrack (DC/DC)
(1) Power input wiring
terminals
(2) PRESENT port
(3) ALM port
(4) Power output wiring
terminals
Ports
describes the ports and terminals on the power subrack (DC/DC).
4 BTS3900 Components
BTS3900
Hardware Description
4-68
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)