1-DBS Hardware Introduction

1

Introduction to DBS3900The DBS stands for Distributed Base Stations. It consist of following Parts:

BBU (Base Band Unit)RRU (Remote Carrier Unit)HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Slide title :32-35pt Color: R153 G0 B0Corporate Font :FrutigerNext LT MediumFont to be used by customers and partners : Arial

Slide text :20-22ptBullets level 2-5: 18pt Color:BlackCorporate Font :FrutigerNext LT MediumFont to be used by customers and partners : Arial

Top right corner for field-mark, customer or partner logotypes.

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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.BBU FunctionsThe BBU3900 is a baseband processing unit. It processes the baseband signals of the base station.The BBU3900 performs the following functions:Provides ports for communication between the base station and the BSC or RNC.Provides CPRI ports for communication between the BBU and the RFUs.Provides USB(1) ports. A USB flash drive that stores required software and configuration data can be inserted into the USB port to perform the automatic base station upgrade.Provides an OM channel between the base station and the LMT or the M2000 to operate and maintain the base station.Processes uplink and downlink data.Manages the entire dual-mode system in terms of OM and signaling processing.Provides the system clock.

HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Slide title :32-35pt Color: R153 G0 B0Corporate Font :FrutigerNext LT MediumFont to be used by customers and partners : Arial



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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.BBU Slot Assignment




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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.UMPTb2Universal Main Processing & Transmission unit with 4E1 and 2FE/GE interface UMPTb2The Universal Main Processing & Transmission unit (UMPT) is a main control and transmission unit commonly used by the BBU3900.

The UMPT performs the following functions:Performs configuration management, device management, performance monitoring, and signaling processing. Processes signaling and manages resources for other boards in the BBU. Provides the USB port, transmission port, maintenance port for transmitting signals, automatically upgrading software, and maintaining the BBU on the LMT or M2000




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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.For more details please check the attachment.4WBBPf1The WCDMA baseband processing unit (WBBP) processes baseband signals for the WCDMA mode

Function:-

The WBBP processes uplink and downlink baseband signals. The WBBP provides CPRI ports for communication with RF modules. The WBBPf installed in slot 2 or 3 supports the BBU interconnection feature




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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.For more details please check the attachment.

5UBRIThe UBRI and UBRIb are short for universal baseband radio interface board and universal baseband radio interface board type b, respectively.

The UBRI or UBRIb provides extended CPRI optical or electrical ports. When the UBRI or UBRIb is working in GSM mode, the RF module processes baseband signals. The UBRIb receives CPRI signals in single-mode or multimode base stations. The UBRIb only supports the single mode in separate-MPT base stations.




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6UPEUThe Universal Power and Environment interface Unit (UPEU) is a power module in the BBU3900.

The UPEU performs the following functions: The UPEUa, UPEUc, and UPEUd convert the -48 V DC input power into +12 V DC power. The UPEUb converts the +24 V DC input power into +12 V DC power. The UPEU provides two ports with each transmitting one RS485 signal and two ports with each transmitting four Boolean signals.




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7UEIUThe Universal Environment Interface Unit (UEIU) is an environment monitoring unit in the BBU3900.

The UEIU performs the following functions: Provides two ports with each transmitting one RS485 signal and two ports with each transmitting four Boolean signals. The Boolean signals can only be dry contact or OC signals. Reports monitoring and alarm signals from other devices in the cabinet to the main control board.




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8RRU3936 (Remote Radio Unit)RRU Functions:-Receives downlink baseband data from the BBU and sends uplink baseband data to the BBU. Receives RF signals from the antenna system, down-converts the signals to intermediate frequency (IF) signals, amplifies the IF signals, and performs analog-to-digital conversion. The transmit (TX) channel filters downlink signals, performs digital-to-analog conversion, and up-converts RF signals to the TX band. Multiplexes receive (RX) and TX signals on the RF channel, which enables these signals to share the same antenna path. It also filters the RX and TX signals. Provides a built-in Bias Tee (BT). The built-in BT couples RF signals and OOK signals and transmits them through the TX/RX port A. The built-in BT also supplies power to the tower mounted amplifier (TMA). The RRU can be powered by the AC/DC power module. In this case, this RRU is called AC RRU




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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the Typesetting Standard.For more details please check the attachment.9Thank youwww.huawei.com

Document TitleSecurity Level

1 UMPTThe Universal Main Processing & Transmission unit (UMPT) is a main control and transmission unit commonly used by the BBU3900.SpecificationsThe following table lists the transmission specifications of the UMPT. Table 1 Transmission specifications of the UMPT

BoardSupported ModeTransmission ModePort QuantityPort CapacityFull/Half-Duplex

UMPTb1/UMPTb2 GSM single-mode UMTS single-mode LTE FDD only LTE TDD only Co-MPT multimode including any modeATM over E1/T1a or IP over E1/T11Four channels-

Transmission over FE/GE electrical ports110 Mbit/s, 100 Mbit/s, or 1000 Mbit/sFull-duplex

Transmission over FE/GE optical ports1100 Mbit/s or 1000 Mbit/sFull- or half-duplex

a: ATM over E1/T1 is supported only in UMTS single-mode or co-MPT multimode including UMTS.

PanelFigure 4 UMPTb1 panel

FunctionThe UMPT performs the following functions: Performs configuration management, device management, performance monitoring, and signaling processing. Processes signaling and manages resources for other boards in the BBU. Provides the USB port, transmission port, maintenance port for transmitting signals, automatically upgrading software, and maintaining the BBU on the LMT or M2000.PrincipleThe following figure shows the working principle of the UMPT. Figure 6 Working principle of the UMPT

PortThe following table describes the ports on the panel of the UMPT.Table 5 Ports on the panel of the UMPT

SilkscreenConnectorDescription

E1/T1DB26 female connectorE1/T1 signal transmission port

FE/GE0RJ45 connectorFE electrical signal transmission port

FE/GE1SFP female connectorFE optical signal transmission port

GPSSMA connectorThe GPS ports on the UMPTa1, UMPTa2, and UMPTb1 are reserved.The GPS ports on the UMPTa6 and UMPTb2 are used for transmitting radio frequency (RF) signals received from the antenna to the satellite card.

USBaUSB connectorA USB flash drive can be inserted into this port for upgrading the software of the base station. This port also functions as a commissioning Ethernet portb.

CLKUSB connector Receives TOD signals. Port for clock signal outputs.

CISFP female connectorUsed for BBU interconnection.

RST-Used for resetting the board.

a: The security of the USB port is ensured by encryption, and the USB port can be shut down using commands. b: When the USB port functions as a commissioning Ethernet port, ensure that an OM port has been opened and the user has obtained required authorities for accessing the base station through the OM port before accessing the base station through the USB port.

IndicatorThe following table describes the three status indicators on the UMPT panel.Table 6 Status indicators on the UMPT

SilkscreenColorStateDescription

RUNGreenSteady onThere is power supply, but the board is faulty.

Steady offThere is no power supply, or the board is faulty.

Blinking (on for 1s and off for 1s)The board is running properly.

Blinking (on for 0.125s and off for 0.125s) The board is being loaded or configured. The board is not started.

ALMRedSteady onAn alarm is generated, and the board needs to be replaced.

Steady offThe board is running properly.

Blinking (on for 1s and off for 1s)An alarm is generated, and you need to locate the fault before determining whether to replace the board.

ACTGreenSteady onThe board serves as an active board.

Steady off The board does not serve as an active board. The board has not been activated. The board is not providing any services.

Blinking (on for 0.125s and off for 0.125s)The operation and maintenance link (OML) is disconnected.

Blinking (on for 1s and off for 1s)The board is being tested, such as an RRU Voltage Standing Wave Ratio (VSWR) test through a USBa flash drive.NOTE: Only the UMPTb1 working in UMTS mode and the UMPTa1 have this indicator status.

In every 4s, the indicator is on for 0.125s and off for 0.125s (eight times) in the first 2s and then off for 2s. All cells configured in the subrack that houses this board are not activated. The S1 link is faulty.NOTE: Only the UMPTb1 working in LTE mode and the UMPTa2 and UMPTa6 have this indicator status.

a: The security of the USB port is ensured by encryption, and the USB port can be shut down using commands.

Besides the preceding three indicators, some other indicators indicate the connection status of the FE/GE optical port, FE/GE electrical port, interconnection port, and E1/T1 port. The indicators that indicate the connection status of the FE/GE optical port and FE/GE electrical port are on both sides of the corresponding ports and have no silkscreen, as shown in the following figure. Figure 7 Indicators for ports

The following table describes the indicators for ports. Table 7 Port status indicators

Corresponding Port/SilkscreenColorStateDescription

FE/GE optical portGreen (LINK on the left)Steady onThe connection is normal.

Steady offThe connection is abnormal.

Orange (ACT on the right)BlinkingData is being transmitted.

Steady offNo data is being transmitted.

FE/GE electrical portGreen (LINK on the left)Steady onThe connection is normal.

Steady offThe connection is abnormal.

Orange (ACT on the right)BlinkingData is being transmitted.

Steady offNo data is being transmitted.

CIRed or greenSteady greenThe interconnection link is normal.

Steady redAn optical module fails to transmit or receive signals due to one of the following reasons: The optical module is faulty. The fiber optic cable is broken.

Blinking red (on for 0.125s and off for 0.125s)Cables are connected in one of following incorrect manners: The S0 port on the UCIU in one BBU connects to the CI port on UMPT in the other BBU, and indicators for all incorrectly connected ports are blinking. The ports are connected in ring topology. Indicators for all incorrectly connected ports are blinking.

Steady offThe optical module cannot be detected.

L01Red or greenSteady offE1/T1 links 0 and 1 are not set up, or a Loss Of Signal (LOS) alarm is generated.

Steady greenE1/T1 links 0 and 1 are working properly.

Blinking green (on for 1s and off for 1s)E1/T1 link 0 is working properly, but E1/T1 link 1 is not set up or an LOS alarm is generated.

Blinking green (on for 0.125s and off for 0.125s)E1/T1 link 1 is working properly, but E1/T1 link 0 is not set up or an LOS alarm is generated.

Steady redAlarms are generated on both E1/T1 links 0 and 1.

Blinking red (on for 1s and off for 1s)An alarm is generated on E1/T1 link 0.

Blinking red (on for 0.125s and off for 0.125s)An alarm is generated on E1/T1 link 1.

L23Red or greenSteady offE1/T1 links 2 and 3 are not set up, or an LOS alarm is generated.

Steady greenE1/T1 links 2 and 3 are working properly.

Blinking green (on for 1s and off for 1s)E1/T1 link 2 is working properly, but E1/T1 link 3 is not set up or an LOS alarm is generated.

Blinking green (on for 0.125s and off for 0.125s)E1/T1 link 3 is working properly, but E1/T1 link 2 is not set up or an LOS alarm is generated.

Steady redAlarms are generated on both E1/T1 links 2 and 3.

Blinking red (on for 1s and off for 1s)An alarm is generated on E1/T1 link 2.

Blinking red (on for 0.125s and off for 0.125s)An alarm is generated on E1/T1 link 3.

There are three indicators (R0, R1, and R2) that indicate in which mode the UMPT is working. The following table lists the meanings of the indicators. Table 8 Mode indicators on the UMPT

SilkscreenColorStateDescription

R0Red or greenSteady offThe board is not working in GSM mode.

Steady greenThe board is working in GSM mode.

Steady redReserved

R1Red or greenSteady offThe board is not working in UMTS mode.

Steady greenThe board is working in UMTS mode.

Steady redReserved

R2Red or greenSteady offThe board is not working in LTE mode.

Steady greenThe board is working in LTE mode.

Steady redReserved

DIP SwitchTwo DIP switches on the UMPTa1, UMPTa2, and UMPTa6 are labeled SW1 and SW2, respectively. Figure 8 shows the positions of DIP switches on these boards. A DIP switch on the UMPTb1 and UMPTb2 is labeled SW2. Figure 9 shows the positions of the DIP switch on these boards. The functions and meaning of SW2 on the UMPTa and UMPTb series boards are the same. Figure 8 Positions of DIP switches on the UMPTa series boards

Figure 9 Positions of the DIP switch on the UMPTb series boards

The DIP switches perform the following functions: SW1 is used to select the E1/T1 mode. SW2 is used to select the grounding mode of E1/T1 transmission.

Each DIP switch has four bits. Table 9 and Table 10 describe the bit settings and meanings of the DIP switches. Table 9 DIP switch SW1

DIP SwitchBit SettingDescription

1234

SW1ONONReservedReservedThe E1 resistance is set to 75 ohms.

OFFONThe E1 resistance is set to 120 ohms.

ONOFFThe T1 resistance is set to 100 ohms.

Table 10 DIP switch SW2

DIP SwitchBit SettingDescription

1234

SW2OFFOFFOFFOFFBalanced

ONONONONUnbalanced

Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd.

2014-01-09HUAWEI ConfidentialPage12, Total12


1 WBBPThe WCDMA baseband processing unit (WBBP) processes baseband signals for the WCDMA mode.SpecificationsThe WBBPs fall into four types, as listed in Table 1. NOTE: The baseband board in slot 2 or slot 3 could transfer the received CPRI data to other boards. There are two CE specifications for the WBBPd1, WBBPd2, WBBPf1, and WBBPf3 as controlled by the license and parameters.Table 1 WBBP specifications

BoardNumber of CellsNumber of UL CEsNumber of DL CEsNumber of HSDPA CodesaNumber of HSDPA UEsNumber of HSUPA UEs

WBBPf16641286x15144144

192256

NOTE: For the signaling specifications of the combined boards, see section "Signaling Specifications" in 3900 Series Base Station Technical Description.PanelExterior of the WBBPf panel

Function The WBBP processes uplink and downlink baseband signals. The WBBP provides CPRI ports for communication with RF modules. The WBBPd supports interference cancellation (IC) within the board. When the CPRI cables connect RF modules carrying corresponding cells to the WBBPd, the WBBPd installed in slot 2 or 3 supports interference cancellation (IC) of uplink data. The WBBPf installed in slot 2 or 3 supports the BBU interconnection feature.

Working PrincipleThe following figure shows the working principle of the WBBP. Figure 5 Working principle of the WBBP

PortDescribes the six CPRI ports and one HEI port on the WBBPf panel. Table 4 Ports on the WBBPf


CPRI0, CPRI1, CPRI2, CPRI3, CPRI4, and CPRI5SFP female connectorThey are the data transmission ports connecting the BBU to RF modules, and support the input and output of optical and electrical transmission signals.

HEIQSFP connectorIt connects to other baseband processing boards to share the baseband resources.

The following table describes the specifications of the CPRI ports on the WBBP. Table 5 Specifications of CPRI ports on the WBBP

BoardQuantity of CPRI PortsCPRI Port Rate (Gbit/s)Topology Type

WBBPf61.25/2.5/4.9/6.144Star, chain, and ring topologies

CPRI ports with different rates support different numbers of cells, as listed in the following table. Table 6 Mapping between the CPRI port rate and the number of cells

CPRI Port Rate (Gbit/s)Number of Cells (1T2R)Number of Cells (2T2R)

1.2544*a

2.588*a

a: * in the preceding table indicates that the number of 2T2R cells supported is halved if two TX antennas enabled with the virtual antenna mapping (VAM) function are connected to two RF modules carried on different CPRI links.

NOTE: In a GU dual-mode base station where the GTMU is connected to port on the WMPT or UMPT through ports on their panels, part of CPRI bandwidth of the UMTS mode is reserved for a TX and an RX channel of the GSM mode in case that bandwidths of the GSM mode are insufficient. As a result, the number of cells supported by the UMTS mode is reduced. IndicatorsTable 7 describes the three status indicators on the WBBP panel. Table 7 Indicators on the WBBP panel

SilkscreenColorStatusDescription



Blinking (on for 1s and off for 1s)The board is running properly.

Blinking (on for 0.125s and off for 0.125s) The board is being loaded or configured. The board is not started.



Blinking (on for 1s and off for 1s)An alarm is generated, and you need to locate the fault before determining whether to replace the board.



Blinking (on for 1s and off for 1s)The power supply for the board is insufficient.NOTE: Of all types of WBBP boards, only the WBBPf has this status.

Besides the three preceding status indicators, the WBBPa or WBBPb provides three indicators indicating the status of small form-factor pluggable (SFP) links. The three indicators are below the SFP ports. The WBBPd or WBBPf provides six indicators indicating the status of SFP links. The six indicators are above the SFP ports. The WBBPf also provides one indicator indicating the status of QSFP links. The following figure shows the positions of the indicators for ports on the WBBPf panel. Figure 6 Positions of the indicators for ports on the WBBPf panel

The following table describes the indicators for ports on the WBBPf panel.Table 8 Indicators for ports on the WBBPf panel


CPRIxRed or greenSteady greenThe CPRI link is functioning properly.

Steady redAn optical module fails to transmit or receive signals due to one of the following causes: The optical module is faulty. The fiber optic cable is broken.

Blinking red (on for 0.125s and off for 0.125s)The RF module connected to the CPRI link has a hardware fault.

Blinking red (on for 1s and off for 1s)The CPRI link is out of lock due to one of the following causes: There is no mutual lock between dual-mode clock sources. The CPRI port rates do not match each other. The VSWR alarm is reported on the RF module connected to the CPRI link when the USB(1) flash drive connected to the main control board is under test.

Steady off The optical module cannot be detected. The CPRI electrical cable is not connected.

HEIRed or greenSteady greenThe interconnection link is functioning properly.


Blinking red (on for 1s and off for 1s)The interconnection link is out of lock due to one of the following causes: There is no mutual lock between two interconnected BBUs. The QSFP port rates do not match each other.

Steady offThe optical module cannot be detected.

NOTE: (1) The security of the USB loading port on the main control board is ensured by encryption. The USB commissioning port is used for commissioning a base station rather than exporting configuration data and information of the base station.




UBRIThe UBRI and UBRIb are short for universal baseband radio interface board and universal baseband radio interface board type b, respectively.SpecificationsThe following table lists the specifications of the UBRI and UBRIb. Table 1 Specifications of the UBRI and UBRIb

BoardApplicable Mode

UBRIGSM

UBRIb GSM The board is required in a co-MPT base station deployed with the GSM mode.

PanelFigure 1 and Figure 2 show the exteriors of the UBRI and UBRIb, respectively. Figure 1 Exterior of the UBRI panel

Figure 2 Exterior of the UBRIb panel

FunctionThe UBRI or UBRIb performs the following functions: The UBRI or UBRIb provides extended CPRI optical or electrical ports. When the UBRI or UBRIb is working in GSM mode, the RF module processes baseband signals. The UBRIb receives CPRI signals in single-mode or multimode base stations. The UBRIb only supports the single mode in separate-MPT base stations.Working PrincipleThe following figure shows the working principle of the UBRI or UBRIb. Figure 3 Working principle of the UBRI or UBRIb

PortThe following table describes the ports on the UBRI or UBRIb.Table 2 Ports on the UBRI or UBRIb


CPRI0 to CPRI5SFP female connectorConnects the BBU and RF modules.

The following table lists the specifications of the CPRI ports on the UBRI and UBRIb. Table 3 Specifications of the CPRI ports on the UBRI and UBRIb

BoardQuantity of CPRI PortsCPRI Port Rate (Gbit/s)Topology Type

UBRI61.25 or 2.5Star, chain, and ring topologies

UBRIb61.25, 2.5, 4.9, 6.144, or 9.8Star, chain, and ring topologies

IndicatorsThe following table describes the three status indicators on the UBRIb panel. Table 5 Indicators on the UBRIb panel




On for 1s and off for 1sThe board is running properly.

On for 0.125s and off for 0.125s The board is being loaded or configured. The board is not started.



On for 1s and off for 1sAn alarm is generated, and you need to locate the fault before determining whether to replace the board.



On for 1s and off for 1sThe power supply for the board is insufficient.

Besides the preceding three indicators, the UBRI or UBRIb provides six indicators indicating the status of the CPRI links, and the six indicators are above the SFP ports. The following table describes the indicators for CPRI links on the UBRI or UBRIb panel. Table 6 Indicators for CPRI links on the UBRI or UBRIb panel


TX RXRed or greenSteady greenThe CPRI link is functioning properly.


Blinking red (on for 1s and off for 1s)The CPRI link is out of lock due to one of the following causes: There is no mutual lock between dual-mode clock sources. The CPRI port rates do not match each other.

Steady off The optical module cannot be detected. The CPRI electrical cable is not connected.




1 UPEUThe Universal Power and Environment interface Unit (UPEU) is a power module in the BBU3900.SpecificationsThe following table lists the specifications of the UPEUa, UPEUc, and UPEUd. Table 1 Specifications of the UPEU

BoardOutput PowerBackup Mode

UPEUaThe output power of a UPEUa is 300 W.1+1 backup

UPEUcThe output power of a UPEUc board is 360 W, and the output power of two UPEUc boards is 650 W.In 1+1 backup mode, the output power of two UPEUc boards is 360 W.

UPEUdThe output power of a UPEUd is 650 W.1+1 backup

PanelFigure 1, Figure 2, Figure 3, and Figure 4 show the four types of the UPEU. NOTE: The UPEUc and UPEUd have silkscreens UPEUc and UPEUd indicating their board types on them, respectively, whereas the UPEUa and UPEUb do not have such silkscreens indicating their board types. The UPEUa and UPEUb, however, can be distinguished by the silkscreens -48V and +24V on them.Figure 1 UPEUa panel

(1) BBU power switch(2) 7W2 connector

Figure 2 UPEUb panel

(1) BBU power switch(2) 7W2 connector

Figure 3 UPEUc panel

(1) BBU power switch(2) 3V3 connector

Figure 4 UPEUd panel

(1) BBU power switch(2) 3V3 connector

FunctionThe UPEU performs the following functions: The UPEUa, UPEUc, and UPEUd convert the -48 V DC input power into +12 V DC power. The UPEUb converts the +24 V DC input power into +12 V DC power. The UPEU provides two ports with each transmitting one RS485 signal and two ports with each transmitting four Boolean signals. The Boolean signals can only be dry contact or open collector (OC) signals.PrincipleThe following figure shows the working principle of the UPEU. Figure 5 Working principle of the UPEU

PortThe UPEU provides two ports with each transmitting one RS485 signal and two ports with each transmitting four Boolean signals. The following figure shows the slots for installing the UPEU in the BBU. Figure 6 Slots for installing the UPEU

The following table describes the ports on the UPEU panel. Table 2 Ports on the UPEU panel

SlotSilkscreenConnectorDescription

Slot 19+24V or -48V3V3 or 7W2 connectorFeeding +24 V or -48 V DC power

EXT-ALM0RJ45 connectorPorts for Boolean signal input 0 to 3


MON0RJ45 connectorPort for RS485 signal input 0


Slot 18+24V or -48V3V3 or 7W2 connectorFeeding +24 V or -48 V DC power





IndicatorThe UPEU has one indicator, which indicates the operating status of the UPEU. The following table describes the indicator. Table 3 Indicator on the UPEU panel

SilkscreenColorStatesDescription

RUNGreenSteady onThe board is running properly.


Parent topic: BBU3900 Boards




1 UEIUThe Universal Environment Interface Unit (UEIU) is an environment monitoring unit in the BBU3900.PanelThe following figure shows the UEIU panel.Figure 1 UEIU panel

FunctionThe UEIU performs the following functions: Provides two ports with each transmitting one RS485 signal and two ports with each transmitting four Boolean signals. The Boolean signals can only be dry contact or OC signals. Reports monitoring and alarm signals from other devices in the cabinet to the main control board.PrincipleThe following figure shows the working principle of the UEIU. Figure 2 Working principle of the UEIU

PortThe following table describes the ports on the UEIU panel.Table 1 Ports on the UEIU panel

SilkscreenConnectorNumber of CPRI PortsDescription

EXT-ALM0RJ45 connector1Ports for Boolean signal input 0 to 3

EXT-ALM1RJ45 connector1Ports for Boolean signal input 4 to 7

MON0RJ45 connector1Port for RS485 signal input 0

MON1RJ45 connector1Port for RS485 signal input 1

Parent topic: BBU3900 Boards




1 RRU ExteriorThis section describes the exterior and dimensions of an RRU.Figure 1 shows an RRU. Figure 1 RRU exterior

Figure 2 shows RRU dimensions.Figure 2 RRU dimensions

2 RRU FunctionsThis section describes the main functions of the RRU.The Remote Radio Unit (RRU) consists of the high-speed interface unit, signal processing unit, power amplifier, duplexer, extension ports, and power module. Figure 1 shows the function structure of the RRU. Figure 1 Function structure of the RRU

NOTE: For details about the extension ports, see RRU Ports.The RRU performs the following functions: Receives downlink baseband data from the BBU and sends uplink baseband data to the BBU. Receives RF signals from the antenna system, down-converts the signals to intermediate frequency (IF) signals, amplifies the IF signals, and performs analog-to-digital conversion. The transmit (TX) channel filters downlink signals, performs digital-to-analog conversion, and up-converts RF signals to the TX band. Multiplexes receive (RX) and TX signals on the RF channel, which enables these signals to share the same antenna path. It also filters the RX and TX signals. Provides a built-in Bias Tee (BT). The built-in BT couples RF signals and OOK signals and transmits them through the TX/RX port A. The built-in BT also supplies power to the tower mounted amplifier (TMA). The RRU can be powered by the AC/DC power module. In this case, this RRU is called AC RRU.

3 RRU PortsThis section describes ports on the RRU panels. An RRU has a bottom panel, cabling cavity panel, and indicator panel.Figure 1 shows the ports on the RRU panels.Figure 1 Ports on the RRU panels

Table 1 describes ports and indicators on the RRU panels.Table 1 Ports and indicators on the RRU panels

ItemSilkscreenRemarks

(1) Ports in the cabling cavityRTN(+)Power supply socket

NEG(-)

CPRI0Optical/electrical port 0, connected to the BBU

CPRI1Optical/electrical port 1, connected to the BBU

(2) Ports at the bottomANT_TX/RXATX/RX port A, supporting RET signal transmission

ANT_RXBRX port B

RX_IN/OUTInterconnection port, used for RRU interconnection

EXT_ALMAlarm monitoring port used for monitoring one RS485 signal and two dry contact signals

RETCommunication port for the RET antenna, supporting RET signal transmission

(3) IndicatorsRUNSee RRU Indicators.

ALM

ACT

VSWR

CPRI0

CPRI1

NOTE: The port for transmitting RET signals is determined by the software. Conect the CPRI0 port to the BBU by default in the single-mode scenario.

1. RRU IndicatorsThis section describes six indicators on an RRU. They indicate the running status. For detailed positions of RRU indicators, see RRU Ports.Table 1 describes RRU indicators.Table 1 RRU indicators

IndicatorColorStatusMeaning

RUNGreenSteady onThere is power supply, but the module is faulty.

Steady offThere is no power supply, or the module is faulty.

Blinking (on for 1s and off for 1s)The board is functioning properly.

Blinking (on for 0.125s and off for 0.125s)Software is being loaded to the module, or the module is not started.

ALMRedSteady onAlarms are generated, and the module must be replaced.

Blinking (on for 1s and off for 1s)Alarms are generated. The alarms may be caused by the faults on the related boards or ports. Therefore, you need to locate the fault before deciding whether to replace the module.

Steady offNo alarm is generated.

ACTGreenSteady onThe module is running properly with TX channels enabled or the software is being loaded without RRU running.

Blinking (on for 1s and off for 1s)The module is running properly with TX channels disabled.

VSWRRedSteady offNo Voltage Standing Wave Ratio (VSWR) alarm is generated.

Steady onVSWR alarms are generated.

CPRI0Red or greenSteady greenThe CPRI link is functioning properly.

Steady redAn optical module fails to transmit or receive signals because the optical module is faulty or the fiber optic cable is broken.

Blinking red (on for 1s and off for 1s)The CPRI link is out of lock because of a failure in clock lock between two modes or mismatched data rates over CPRI ports.

Steady offThe optical module cannot be detected, or the optical module is powered off.

CPRI1Red or greenSteady greenThe CPRI link is functioning properly.

Steady redAn optical module fails to transmit or receive signals because the optical module is faulty or the fiber optic cable is broken.

Blinking red (on for 1s and off for 1s)The CPRI link is out of lock because of a failure in clock lock between two modes or mismatched data rates over CPRI ports.

Steady offThe optical module cannot be detected, or the optical module is powered off.

Optical ModulesAn optical module transmits optical signals between an optical port and a fiber optic cable.NOTE: The exteriors of an optical module and the label on an optical module in this section are for reference only. The actual exteriors may be different.ExteriorThe following figure shows the exterior of an optical module. Figure 1 Exterior of an optical module

Label on an optical moduleThere is a label on each optical module, which provides information such as the rate, wavelength, and transmission mode, as shown in the following figure. Figure 2 Label on an optical module

(1) Rate(2) Wavelength(3) Transmission mode

Optical Module TypeOptical modules can be divided into single- and multimode optical modules, which can be distinguished as follows: The puller of a single-mode optical module is blue and the puller of a multimode optical module is black or gray. The transmission mode is displayed as "SM" on the label of a single-mode optical module and "MM" on the label of a multimode optical module.

RRU Power CableThe RRU power cable is a -48 V DC shielded cable. It feeds -48 V DC power to an RRU. The maximum length of an RRU power cable delivered with RRUs is 50 m (164.04 ft) by default.NOTE: The maximum length of power supply that an RRU power cable supports is 150 m (492.12 ft). Contact Huawei engineers when an RRU power cable greater than 50 m (164.04 ft) is required. If a power device provided by the customer is used, the recommended specification of the circuit breaker on this power device is 15 A to 30 A.ExteriorThere are two types of RRU power cables in terms of cross-sectional areas: 3.3 mm2 (0.005 in.2) (12 AWG) complying with North American standards and 4 mm2 (0.006 in.2) complying with European standards.A tool-less female connector (pressfit type) needs to be added to one end of the RRU power cable and a corresponding terminal needs to be added to the other end based on the requirements of the connector on the external power device, as shown in Figure 1.Figure 1 RRU power cable

(1) -48 V DC power cable(2) Shield layer(3) Tool-less female connector (pressfit type)

Table 1 lists the specifications of an RRU power cable.Table 1 Specifications of an RRU power cable

CableWireWire Color in Most RegionsWire Color in Other Regions

North American StandardEuropean StandardUK

RRU power cableRTN(+)BlackBrownBlue

NEG(-)BlueBlueGray

CPRI Fiber Optic CableCPRI fiber optic cables are classified into multimode fiber optic cables and single-mode fiber optic cables. They transmit CPRI signals.Multimode fiber optic cables connect the BBU and RRU or interconnect two RRUs. The maximum length of the multimode fiber optic cable between the BBU and RRU is 150 m (492.12 ft) and the multimode fiber optic cable between two RRUs has a fixed length of 10 m (32.81 ft).A single-mode fiber optic cable consists of the single-mode pigtail and trunk single-mode fiber optic cable, and the single-mode pigtail and trunk single-mode fiber optic cable are interconnected using the ODF. The maximum length of the single-mode pigtail is 20 m (65.62 ft) on BBU side and 70 m (229.66 ft) on RRU side.NOTE: The ODF and trunk single-mode fiber optic cable are provided by the customer and must comply with the ITU-T G.652 standard. The ODF is an outdoor transfer box for fiber optic cables, which interconnects the single-mode pigtail and trunk single-mode fiber optic cable. A multimode fiber optic cable and a single-mode fiber optic cable are connected to a multimode optical module and a single-mode optical module, respectively.ExteriorMultimode fiber optic cable: The multimode fiber optic cable has a DLC connector at each end, as shown in Figure 1. Figure 1 Multimode fiber optic cable

(1) DLC connector(2) Breakout cable(3) Label on the breakout cable

NOTE: When a multimode fiber optic cable connects a BBU and an RRU, the breakout cable on the BBU side is 0.34 m (1.12 ft) and the breakout cable on the RRU side is 0.03 m (0.098 ft). When a multimode fiber optic cable connects two RRUs, the breakout cable on both sides is 0.03 m (0.098 ft).Figure 2 shows the connection of the multimode fiber optic cable between a BBU and an RRU. Figure 2 Connection of the multimode fiber optic cable between a BBU and an RRU

(1) Multimode fiber optic cable between a BBU and an RRU

Single-mode pigtail: The single-mode pigtail has a DLC connector at one end and an FC, LC, or SC connector at the other end, as shown in Figure 3. Figure 3 Single-mode pigtail

(1) DLC connector(2) Breakout cable(3) Label on the breakout cable(4) FC connector(5) LC connector(6) SC connector

NOTE: When a single-mode pigtail connects a BBU and an ODF, the breakout cables on the BBU side and ODF side are 0.34 m (1.12 ft) and 0.8 m (2.62 ft), respectively. When a single-mode pigtail connects an RRU and an ODF, the breakout cables on the RRU side and ODF side are 0.03 m (0.098 ft) and 0.8 m (2.62 ft), respectively.Figure 4 shows the connection of the single-mode pigtail. Figure 4 Connection of the single-mode pigtail

(1) Single-mode pigtail between a BBU and an ODF(2) Single-mode pigtail between an RRU and an ODF

Selection PrinciplesThe following table describes the principles for selecting CPRI fiber optic cables. Table 1 Principles for selecting CPRI fiber optic cables

Remote DistanceSelection PrincipleRemarks

Less than or equal to 100 m (328.08 ft)Multimode fiber optic cableConnects the BBU and RRUWhen it connects two RRUs, the distance between the two RRUs must be equal to or less than 10 m (32.81 ft).

Greater than 100 m (328.08 ft) and equal to or less than 150 m (492.12 ft)Multimode fiber optic cableConnects the BBU and RRU

Recommended: single-mode fiber optic cable (single-mode pigtail and trunk single-mode fiber optic cable)The single-mode pigtail at the RRU or BBU side is connected to the trunk single-mode fiber optic cable using the ODF.

Greater than 150 m (492.12 ft)Single-mode fiber optic cable (single-mode pigtail and trunk single-mode fiber optic cable)

Pin AssignmentTable 2 describes the labels on and recommended connections for the breakout cables of a CPRI fiber optic cable.Table 2 Labels on and recommended connections for the breakout cables of a CPRI fiber optic cable

LabelInstallation Position

Multimode Fiber Optic Cable Between a BBU and an RRUMultimode Fiber Optic Cable Between Two RRUsSingle-Mode Pigtail

1ACPRI RX port on the RRUCPRI RX port on RRU 1RX port on the BBU or CPRI RX port on the RRU

1BCPRI TX port on the RRUCPRI TX port on RRU 1TX port on the BBU or CPRI TX port on the RRU

2ATX port on the BBUCPRI TX port on RRU 0ODF

2BRX port on the BBUCPRI RX port on RRU 0ODF

RRU RF JumperThe 1/2" RRU RF jumper transmits and receives RF signals between an RRU and an antenna. A fixed-length RF jumper used by an RRU is 2 m (6.56 ft), 3 m (9.84 ft), 4 m (13.12 ft), 6 m (19.68 ft), or 10 m (32.81 ft). A variable-length RF jumper used by an RRU has a maximum length of 10 m (32.81 ft).NOTE: When the distance between an RRU and an antenna is less than 10 m (32.81 ft), one end of the RF jumper is connected to the ANT-TX/RXA or ANT-TX/RXB port at the bottom of the RRU, and the other end is connected to the antenna. When the distance between an RRU and an antenna is greater than 10 m (32.81 ft), one end of the RF jumper is connected to a feeder, and the other end is connected to the antenna. If the customer prepares the RF jumper, the length of the RF jumper should be as short as possible and not exceed 2 m (6.56 ft.).ExteriorAn RF jumper has a DIN male connector at one end and a customized connector at the other end.Figure 1 shows an RF jumper with a DIN male connector at each end. Figure 1 RF jumper

(1) DIN male connector

Inter-RRU RF CableAn inter-RRU RF cable connects the RX_IN/OUT ports on two RRUs in the same cell and transmits RF signals between the RRUs. The length of the inter-RRU RF cable is 2 m (6.56 ft).ExteriorFigure 1 shows an inter-RRU RF cable with a DB2W2 connector at each end.Figure 1 Inter-RRU RF cable

(1) DB2W2 connector


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