Port/Switch
Function
Power supply test port
Measuring the power voltage by using a multimeter through the
-48V/+24V and 0V ports
TEST port
Testing
Battery control switch
Controlling the connection of the batteries through the ON and OFF
ports
l
Press and hold the ON port for 5s to 10s to connect to the
batteries.
l
Press and hold the OFF port for 5s to 10s to disconnect the
batteries.
CAUTION
l
You must insert a small round bar into the hole when you operate the
battery control switch. When you hear a crack, the batteries are connected
or disconnected.
COM port
Reserved for connecting to the external signal monitoring board
describes the LEDs on the panel of the PMU.
Table 4-66
LEDs on the panel of the PMU
Label
Color
Status
Description
RUN
Green
Blinking (on for 1s and
off for 1s)
The unit is functional, and the
communication with the BBU or upper-level
PMU is normal.
Blinking (on for 0.125s
and off for 0.125s)
The unit is functional, but the communication
with the BBU or upper-level PMU fails. If
the unit does not communicate with the BBU
or upper-level PMU for one minute, the
communication is regarded as failed.
On or off
The unit is faulty or the unit is in power-on
self-check state.
ALM
Red
On
The base station reports at least one of the
following alarms:
l
Mains overvoltage or undervoltage alarm
l
Busbar overvoltage or undervoltage
alarm
l
Alarm related to PSUs
l
Load disconnection alarm
Off
No alarm is reported.
4 BTS3900 Components
BTS3900
Hardware Description
4-72
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)