CATEGORY
BBU Working Principle
A BBU consists of the following subsystems: baseband subsystem, power and mechanical subsystem, transmission subsystem, interconnection subsystem, main control subsystem, monitoring subsystem, and clock subsystem. Each subsystem consists of different modules, as listed in the following table.
Table 1 Components of the BBU
| Subsystem | Module |
| Baseband subsystem | Baseband processing unit (BBP) |
| Power and mechanical subsystem | Backplane, fan unit (FAN), and power and environment interface unit (PEU) |
| Transmission subsystem | Main processing and transmission unit (MPT) |
| Interconnection subsystem | MPT |
| Main control subsystem | MPT |
| Monitoring subsystem | PEU and environment interface unit (EIU) |
| Clock subsystem | MPT and satellite card and clock unit (SCU) |
The following figure shows the working principle of a BBU.
Figure 2 Working principle of a BBU
BBU Function
A BBU performs the following functions:
- Provides ports for connecting to the transmission equipment, RF modules, USB devices, external reference clock, and LMT or MAE to transmit signals, perform automatic base station software upgrade, receive reference clock signals, and support BBU maintenance on the LMT or MAE.
- Manages the entire base station system. The management involves uplink and downlink data processing, signaling processing, resource management, and operation and maintenance.
BBU5900 Matching Boards
Table 2 lists the boards that can be used in the BBU5900.
| Matching Boards | |
| Main control board | UMPTb1, UMPTb2, UMPTb3, UMPTb9, UMPTe1, UMPTe2, UMPTe3, UMPTg1, UMPTg2, UMPTg3, UMPTga1, UMPTga2, UMPTga3 |
| Baseband processing board | UBBPd1, UBBPd2, UBBPd3, UBBPd4, UBBPd5, UBBPd6, UBBPd9, UBBPe1, UBBPe2, UBBPe3, UBBPe4, UBBPe5, UBBPe6, UBBPe18, UBBPg1, UBBPg1a, UBBPg2, UBBPg2a, UBBPg3b, UBBPg3, UBBPg4, UBBPei, UBBPem, UBBPex2, UBBPf1, UBBPf3, UBBPfw1 |
| Satellite-card board | USCUb18, USCUb16, USCUb14, USCUb11 |
| Fan module | FANf |
| Power module | UPEUe |
| Environment monitoring unit | UEIUb |
BBU5900 Equipment specifications
Table 3 BBU5900 Equipment specifications
| Equipment specifications | |
| Power input type | –48 V DC |
| Operating voltage | –38.4 V DC to –57 V DC |
| Dimensions (H x W x D) | 86 mm x 442 mm x 310 mm (3.39 in. x 17.40 in. x 12.20 in.) |
| Weight | 18 kg (39.69 lb) in full configuration |
| Typical power consumption | check out the Power Consumption Tool HW |
| Operating temperature | Long-term operation: –20°C to +55°C (–4°F to +131°F) |
| Relative humidity | 5% RH to 95% RH |
| Ingress protection rating | IP20 |
| Altitude | ≤ 4000 m (13123.36 ft) |
| Noise sound power level | ETS 300 753 3.1 ≤ 7.2 bels |
| Storage time | Installed and used within one year |
The site capacity specifications and signaling specifications need to be calculated based on the specific UBBP board model. Therefore, this section does not describe the calculation.
The differences between the BBU5900 series and the BBU3900 series are as follows: More powerful performance and support for 5G networks.
