Huawei Airbridge BTS3612A-1900 Technical Manual page 65

Technical Manual
Airbridge BTS3612A CDMA Base Station
III. PMU
The PMU is the core of the monitoring system. It is responsible for collecting,
processing and reporting all the environment variables.
IV. Air conditioner
The air conditioner can realize closed-loop control over the temperature inside the
cabinet.
When the air conditioner finds that the temperature is too low, it will start its heating
plates and internal fans to heat the BTS. When the temperature is too high, the air
conditioner will activate the cooling function to lower the temperature to a normal
degree.
V. Heat exchanger
A heat exchanger can also be used instead of the air conditioner to control the
temperature inside the cabinet. The heat exchanger has high/low-temperature alarm
circuits. When the temperature inside the cabinet is higher than the temperature
outside, it will discharge the heat through closed circulation. Compared with the air
conditioner, the heat exchanger has a simpler structure with fewer components, and
thus is more cost-effective.
Chapter 5 Power & Environment Monitoring Subsystem
5-8
System Principle