l
The USCU provides interface for an external RGPS device (such as a reused device of the
operator), Metro1000 device, BITS device, and TOD input.
l
The USCUb1 has the GPS receiver. It is used for clock synchronization or obtaining
accurate clock signals from transmission devices.
l
A dual-satellite receiver is configured in a USCUb2, which supports GPS, GLONASS, or
COMPASS clock signals.
LED
describe the LEDs on the USCU.
Table 4-30
LEDs on the USCU
LED
Color
Status
Description
RUN
Green
On
There is power supply, and the
board is faulty.
Off
There is no power supply, or the
board is faulty.
Blinking (on for 1s
and off for 1s)
The board is running properly.
Blinking (on for
0.125s and off for
0.125s)
Software is being loaded to the
board, or the board is not
configured.
ALM
Red
Off
The board is running properly,
and no alarm is generated.
On
An alarm is generated, and the
board needs to be replaced.
Blinking (on for 1s
and off for 1s)
An alarm is generated. The
alarm may be caused due to
faults in the related boards or
ports. Therefore, whether the
board needs to be replaced
cannot be determined.
ACT
Green
On
The serial port for
communication between the
USCU and the main control
board is enabled.
Off
The serial port for
communication between the
USCU and the main control
board is disabled.
4 BTS3900 Components
BTS3900
Hardware Description
4-30
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)