This text describes the board configuration principles of the BBU Huawei:
Slots of the BBU:
Board Configuration Principles of the BBU:
Typical Configuration of the BBU:
GTMU:
The GSM Transmission & Timing & Management Unit for BBU (GTMU) is the basic
transmission and control function entity of the BBU. It provides the reference clock, maintenance port, and external alarm collection port, monitors the power supply, and controls and manages the entire base station.
The GTMU is classified into two types: GTMU and GTMUb. Figure 3-4 and Figure 3-5 show
the panels of the GTMU and GTMUb.
Functions:
1, Controls and manages the base station
2, Supports fault management system, configuration management system, performance
management system, and security management system
3, Monitors the fans and power modules
4, Provides and manages the clock source of the base station in centralized mode
5, Provides the clock output for test
6, Provides the ETH port for maintenance on the OM system
7, Supports transmission through four E1s
8, Provides CPRI ports for communication between the BBU and the RFUs
9, The GTMUb supports interconnected BBUs.
10, Four IDX2 ports on the backplane of the GTMUb can achieve the function of baseband
resource pool backup.
FAN:
The FAN is the fan unit of the BBU. The FAN controls the fan speed, detects the temperature of the fan board, and dissipates the heat in the BBU.
Functions&#;
01&#; Controls the fan speed.
02&#; Reports the fan status to the main control board.
03&#; Detects the temperature of the air inlets.
04&#; Dissipates the heat.
UPEU Board&#;
The Universal Power and Environment Interface Unit (UPEU) is a mandatory board of the BBU. It converts -48 V or +24 V DC power to +12 V DC power. The UPEU is classified into the Universal Power and Environment Interface Unit Type A(UPEUA) and the Universal Power and Environment Interface Unit Type B (UPEUB). The UPEUA converts -48 V DC to +12 V DC and the UPEUB converts +24 V DC to +12 V DC.
Functions:
01, Converts -48 V or +24 V DC to +12 V DC that is applicable to the boards
02, Provides four ports with two ports transmitting two RS485 inputs and the other two ports transmitting eight Boolean signals
03, Provides reverse connection protection for power cable connectors.
UEIU Board:
The Universal Environment Interface Unit (UEIU) transmits monitoring and alarm signals from the external devices to the main control and transmission unit.
Functions:
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01, Provides two ports, each transmitting one RS485 signal.
02, Provides two ports, each transmitting four boolean signals.
03, Transmits monitoring signals and alarm signals from external devices to the main control and transmission unit.
USCU Board:
Functions:
01, The USCU provides interface for an external RGPS device (such as a reused device of the operator), BITS device, and TOD input.
02, The USCUb1 supports the GPS with the built-in satellite card. It is used for clock
synchronization or obtaining accurate clock signals from transmission devices.
03, The USCUb2 supports GPS and GLONASS with two built-in satellite cards.
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