5.1 Principles for Monitoring a BTS3900C Cabinet
A BTS3900 cabinet is monitored by various boards. The boards collect alarms from sensors and
fans, and then transmit the alarm signals to the MON port on the BBU through the RS485 serial
bus. In this manner, the boards monitor the cabinet.
Principles for Monitoring a BTS3900C Cabinet in the 110 V AC or 220 V AC Power
Supply Scenario
Figure 5-1 illustrates the principles for monitoring a BTS3900C cabinet when the BBU is
installed in the OMB. For details about modules monitored by the HEUB, see 5.3.1 HEUB.
Figure 5-1 Principles for monitoring of a BTS3900C cabinet when the BBU is installed in the
OMB
Principles for Monitoring a BTS3900C Cabinet in the -48 V DC Power Supply
Scenario
Figure 5-2 illustrates the principles for monitoring a BTS3900C cabinet when the BBU is
installed in the OMB. For details about modules monitored by the HEUB, see 5.3.1 HEUB.
Figure 5-2 Principles for monitoring of a BTS3900C cabinet when the BBU is installed in the
OMB
5.2 BBU Monitoring Port
The BBU houses the UPEU and UEIU for monitoring. Each board has two Boolean input ports
and two RS485 input ports, and each Boolean input port receives four Boolean inputs.
BTS3900C (Ver.C)
Hardware Description 5 BTS3900C Monitoring System
Issue 03 (2013-05-27) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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