2.1 Functions of the EMU
This describes the functions of the environment monitoring unit (EMU). Providing a variety of
input ports for monitoring signals, the EMU supports real-time monitoring and remote
monitoring. In addition, the EMU is highly reliable and can be flexibly configured. It supports
a large area for temperature monitoring.
Power Input
l
The EMU supports input voltage detection. The alarm threshold for the input voltage can
be configured on the BTS/NodeB and delivered to the EMU.
l
The EMU provides two power input ports, which are protected from inverse connections.
l
The range of voltage input is -36 V DC to -72 V DC.
Environment Monitoring
l
The EMU provides an independent port for 12 V/24 V DC current-type (4 mA - 20 mA)
humidity/temperature sensors. The temperature monitoring range is -20
o
C [-4
o
F] to 80
o
C
[176
o
F].
l
The EMU provides four ports for monitoring analog signals. Voltage-type (0 V - 5 V)
sensors and current-type (4 mA - 20 mA) sensors can be used. The types of monitored
analog signals can be configured through the DIP switch settings according to the BTS/
NodeB configuration.
Boolean Signal Monitoring
The EMU provides 32 ports for monitoring Boolean signals. Dry contact point signals and OC
signals are supported.
Relay Node Control
The EMU provides six output control ports for external Boolean signals of the relay node type.
Communication Ports
The EMU provides two RS-485 ports, which is used for the communication between the EMU
and the BTS/NodeB.
2.2 Exterior of the EMU
This describes the exterior of the two EMU models.
Exterior of EMU model A
show the exterior of EMU model A and its front panel respectively.
2 Overview of the EMU
EMU
User Guide
2-2
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 13 (2009-12-30)