In this post, I will introduce the BBU3900 and BBU3910 in detail to facilitate your understanding of the product.
BBU3900 exterior
Figure 1 BBU3900 exterior
Figure 2 BBU3910 exterior
BBU3900 and BBU3910 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) and transmission processing unit (TRP)
Interconnection subsystem
MPT (UMPT only) and inter-connection infrastructure unit (CIU)
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 3 Working principle of a BBU
BBU3900 and BBU3910 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 upgrades, 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.
BBU3900 and BBU3910 Matching Boards
Boards Supported by BBUs
The following table describes boards supported by different types of BBUs, regardless of mode and configuration.
Table 4 BBU3900 and BBU3910 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
15 kg (33.08 lb) in full configuration
≤ 7 kg (15.44 lb) in typical configuration
Heat Dissipation Capabilities
BBU3900
When configured with a FAN: 350 W
When configured with a FANc: 650 W
BBU3910
When configured with a FANd: 1000 W
When configured with a FANe: 1000 W
Operating temperature
Long-term operation: –20°C to +55°C (–4°F to +131°F)
Short-term operation(1): +55ºC to +60ºC (+131°F to +140°F)
(1): Short-term operation indicates continuous operation for fewer than 96 hours or operation for fewer than 15 days in a year.
ETSI EN 300 019-1-1 Class1.2
NOTE:
The validity period is one year.
The product can function properly within the validity period if the storage environment meets the preceding standards.
Surge protection
IEC 62305-1 Protection against lightning - Part 1: General principles
IEC 62305-3 Protection against lightning - Part 3: Physical damage to structures and life hazard
IEC 62305-4 Protection against lightning - Part 4: Electrical and electronic systems within structures
ITU-T K.35 Bonding configurations and earthing at remote electronic sites
ITU-T K.56 Protection of radio base stations against lightning discharges
ITU-T K.97 Lightning protection of distributed base stations
ETSI EN 300 253 Environmental Engineering(EE): Earthing and bonding configuration inside telecommunications centers
YD/T 2324-2011: Lightning protection requirements and test methods for radio base stations
GB 50689-2011 Code for design of lightning protection and earthing engineering for telecommunication bureaus (stations)
The site capacity and signaling specifications are calculated based on the UBBP model. Therefore, capacity specifications are not described in this section.
The difference between the BBU3900 and the BBU3910 is that the BBU3910 supports more boards, because the BBU3910 is released later than the BBU3900.
In this post, I will introduce the BBU3900 and BBU3910 in detail to facilitate your understanding of the product.
BBU3900 exterior
Figure 1 BBU3900 exterior
Figure 2 BBU3910 exterior
BBU3900 and BBU3910 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) and transmission processing unit (TRP)
Interconnection subsystem
MPT (UMPT only) and inter-connection infrastructure unit (CIU)
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 3 Working principle of a BBU
BBU3900 and BBU3910 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 upgrades, 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.
BBU3900 and BBU3910 Matching Boards
Boards Supported by BBUs
The following table describes boards supported by different types of BBUs, regardless of mode and configuration.
Table 4 BBU3900 and BBU3910 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
15 kg (33.08 lb) in full configuration
≤ 7 kg (15.44 lb) in typical configuration
Heat Dissipation Capabilities
BBU3900
When configured with a FAN: 350 W
When configured with a FANc: 650 W
BBU3910
When configured with a FANd: 1000 W
When configured with a FANe: 1000 W
Operating temperature
Long-term operation: –20°C to +55°C (–4°F to +131°F)
Short-term operation(1): +55ºC to +60ºC (+131°F to +140°F)
(1): Short-term operation indicates continuous operation for fewer than 96 hours or operation for fewer than 15 days in a year.
ETSI EN 300 019-1-1 Class1.2
NOTE:
The validity period is one year.
The product can function properly within the validity period if the storage environment meets the preceding standards.
Surge protection
IEC 62305-1 Protection against lightning - Part 1: General principles
IEC 62305-3 Protection against lightning - Part 3: Physical damage to structures and life hazard
IEC 62305-4 Protection against lightning - Part 4: Electrical and electronic systems within structures
ITU-T K.35 Bonding configurations and earthing at remote electronic sites
ITU-T K.56 Protection of radio base stations against lightning discharges
ITU-T K.97 Lightning protection of distributed base stations
ETSI EN 300 253 Environmental Engineering(EE): Earthing and bonding configuration inside telecommunications centers
YD/T 2324-2011: Lightning protection requirements and test methods for radio base stations
GB 50689-2011 Code for design of lightning protection and earthing engineering for telecommunication bureaus (stations)
The site capacity and signaling specifications are calculated based on the UBBP model. Therefore, capacity specifications are not described in this section.
The difference between the BBU3900 and the BBU3910 is that the BBU3910 supports more boards, because the BBU3910 is released later than the BBU3900.
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