2. RBS Hardware

2 RBS 2X16 Hardware Description

Objectives

Discriminate the functionalities, capabilities andstructure of each part of the RBS 2x16, exploring student book and available RBS hardware.

Identify the different RBSs cabinet and the main characteristics

List the functions of the RBS 2x16 subracks; Recognize boards and modules, including connections,

indicators (LEDs) and buttons; Identify the optional RUs; Identify and describe the new Site Integration Unit - SIU Detail the Climate System and Power System of each RBS; Identify the BBS 2X16 data.

Figure 2-1.

BRBRAITT, Jabalpur, Issued in SEPT- 2009

Version 0 Revision 1 JTO PH II (3G) Ericsson

2-1

INTRODUCTIOThe document gives a technical overview of the RBS 2216 andRBS 2116, hereafter referred to as RBS 2X16.

RBS 2X16 – A MEMBER OF THE RBS 2000

The RBS 2x16 models are members of the world leading RBS2000 family, intended for indoor applications (RBS 2216) and outdoor applications (RBS 2116) with up to 12 transceivers per cabinet.The RBS 2x16 models continue the path of excellent coverage basestations from Ericsson. The improved radio performance means increased site-to-site distance, and therefore, fewer sites.

12 TRX per cabinet Supported for 900E, 900P

and 1800 MHz radio configurations

Built-in bias Injector GPRS/EDGE support AMR Support Frequency hopping

Figure 2-2. RBS 2X16 -

The RBS 2216 is a macro base station supporting up to twelvetransceivers per cabinet. The cabinet has a footprint of 0,24m² anda height of only 90 cm. Two RBS 2X16 cabinets can be stacked on each other, resulting in a 24-carrier site with a height of only 180 cm. It is also possible to stack one RBS 2X16 on top of one BBS2X16 (site support cabinet), resulting in a 12 carrier site including The RBS 2116 is an outdoor macro base station. The climatesystem of the RBS 2116 is located in the door. The footprint of the RBS 2116 only 0,42 m² and the height is mere 130 cm (excl base frame). The RBS 2116 provides installation flexibility. It can be installed in one piece, pre-assembledand pre-tested from production. It can also easily be disassembled and reassembled into four major components, in order to simplify installation when cranes cannot be used.


2-2BRBRAITT, Jabalpur, Issued in SEPT- 2009

The RBS 2x16 models are available for GSM 900 (P-GSM and E-GSM) and GSM 1800.Filter combining is not supported in RBS 2X16. It is recommendedto continue using RBS 2206 and RBS 2106 if filter combining is needed. Furthermore the internal VSWR function has been removed. Instead, it is recommended to use the BSS function “Find Faulty Antenna Installations” alternatively use an external VSWR unit.19” transmission equipment for a site with RBS 2x16 is located inthe site support cabinet BBS 2X16.

RBSType Location

Maxnumber of TRXs

CellsDimension(W/D/H) in

mm

OutputPower(dBm)

Band

2116

2216

Outdoor

Indoor

12

12

3

3

650/890/1750*

600/523/950

4645,546

45,5

GSM900GSM1800GSM900

GSM1800

Figure 2-3. RBS 2116 and 2216 - Technical



2-3

RBS 2X16 HARDWARE UNITS

IDM

FCU

PSUTMA CMDXU

Door with heatexchanger

DRU

RXS

ACCU

Space for TXModule or

Battery Backup

OVP

Figure 2-4. RBS 2116 Hardware Units

The RBS 2X16 comprises the following major

Double Radio Unit (DRU)

RX splitter (RXS)

Distribution Switch Unit (DXU)

AC/DC connection Unit (ACCU / DCCU)

Power Supply Unit (PSU)

Internal Distribution Module (IDM)

Over Voltage Protection Units (DF-OVP). (In RBS 2116 only.)

As option Tower Mounted Amplifier (TMA) is supported.



2-4

DRU

DRU

DRU

DRU

DRU

DRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DXU31

DXU31

X-PolAnt

X-PolAnt

X-PolAnt

PSU ACCU/ DCCU

ACCUor

DCCU

PSU

IDM

FCU andFan units

DXU

TMA-CM

DRU

RXS

Figure 2-5. RBS 2216 Hardware Units

BLOCK DIAGRAM

ESB(TG Sync)

ExternalAlarms

OMT Interface

DXU31

YL I N K

DRU

DRU

DRU

DRU

X-PolAnt

X-PolAnt

PCM (4)

+24VD

DRU

DRU

X-PolAnt

PSU

ACCU/ DCCU

Mains Supply

Figure 2-6. RBS 2116 - Block Diagram



2-5

DRU

DRU

DRU

DRU

DRU

DRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DRUDRU

DXU31

DXU31

X-PolAnt

X-PolAnt

X-PolAnt

PSUPSU

ESB(TG Sync)

ExternalAlarms

OMT Interface

DXU31

YL I N K

DRU

DRU

DRU

DRU

X-PolAnt

X-PolAnt

PCM (4)

+24VDC

DRU

DRU

X-PolAnt

PSUMains Supply

(AC or DC)

Figure 2-7. RBS 2216 - Block Diagram



2-6

DISTRIBUTION SWITCH UNIT (DXU-

Serves as the Central Main CPU node

Interface to the transport network through four E1/T1 transmission ports

Handles incoming traffic, controls and supervises information within the RBS

Provides frequency reference signals and timing signals for circuits within the RBS

Controls climate and power systems

Transceiver Group (TG) Syncronization

Figure 2-8. Distribution Switch Unit - DXU 31 - General

PRODUCT OVERVIEW

The DXU extracts timing information from the transmissioninterfaces and generates a timing reference for the RBS. The DXU also performs supervisory tasks. The DXU transmission interface has long-haul capability and can be configured for both 1.544

Main Functions

The DXU serves as the Central Main CPU Node (CMCN) and itsmain functions are as follows: Provides the RBS with an interface to the transport

network through four E1/T1 transmission ports

Handles incoming traffic, controlling and supervising information, and sending it to its destination in the RBS

Provides frequency reference signals and timing signals for circuits in the RBS

Stores and executes RBS software stored on a removable flash card

Controls climate and power systems in not equipped withEnergy Control Units (ECU) cabinets



2-7

Compact DXUFlash Card

Interface

CPU System

TrasnmissionInterface Communication PowerController Switch Supply

System

Function Description

The DXU consists of the following main

Central Processing Unit (CPU) system

Communication switch system

Transmission interface controller

Power supply

Timing system

Miscellaneous logic

Compact flash card

Internal Alarms

External Alarms

IOM - Bus

CompactFlash Card

Interface

CPU System

DXU

Ext. Sync Source (GPS)

Ext. Sync Bus (ESB)

O&M Terminal (OMT)

TransmissionInterfacesA/B/C/D

Y-Link 1-

TrasnmissionInterface

ControllerCommunication

SwitchSystem

PowerSupply

Y-Link 7-12+24 VDC

Figure 2-9. Distribution Switch Unit - DXU 31 - Block

CPU System

The heart of the DXU is a 32-bit embedded controller, withinterfaces to a wide range of peripherals.The CPU system consists of the

I2C controller Random-Access Memory (RAM) Flash memory CPU Compact flash card



2-8

Communication Switch System

This system block contains circuits that handle traffic between theBase Station Controller (BSC) and the Double Radio Units (DRU).

Transmission Interface Controller

This part contains circuits for four transmission ports and thetransmission interface controller, which controls the traffic for all four transmission ports.The bit rate is controlled by software. Two speeds are available: E1(2.048 Mbps) or T1 (1.544 Mbps).

Power Supply

The power supply delivers all the voltages necessary for the DXU.The input voltage, +24 V DC, is supplied through the DC-in connector on the front of the unit.

Miscellaneous Logic

This function contains the

System voltage measurement

Temperature measurement

Power-on reset

Compact Flash Card

The removable Compact flash card permits quick and easy changeof the DXU.



2-9

INTERFACES

This section describes the signal, power, and operator interfaces ofthe DXU.

ESB

OMT

Y-Link 1-6Y-Link 7-12

ExternalAlarm

DC inTransmission

Ports

IOM

GPS

Figure 2-10. Distribution Switch Unit – DXU-31 -

TRANSMISSION INTERFACES

The four transmission interfaces are connected to the BSC (GSM-Abis protocol) or to cascaded RBSs. In cascade mode, this interface can control an external bypass relay. Unused time slots can be through-connected to a successive base station. The communication speed is 2 Mbps in E1 interfaces and 1.5 Mbps in T1 interfaces.



2-10

External Alarm Inputs

Up to 16 binary alarms can be connected through this

The equipment connected to the terminals must have insulatedrelay contacts. A closed contact (logic zero) is required to be below2 k , and an open contact (logic one) is required to be above 100The current through a closed 0 contact is 1.31

The alarm contacts connected to the external alarm inputs must beinsulated and have a current range above 1.4 mA. The voltage between terminals with an open contact is +24 V DC.

Y Links

This interface is used to transfer uplink and downlink data and tohandle, frequency, timing, and communication with the DRUs. TheThe Y links are accessed through connectors located on the front ofthe DXU.

Internal Alarm

This interface is used for communication with the power supplyand equipment in the RBS, such as a Power Supply Unit (PSU) andThe interface is accessible through the interface alarm 1 connectorlocated on the front of the DXU.

GPS

This interface is used to interface an external synchronizationsource, such as the Global Positioning System (GPS). It is accessed through an RJ-45 connector on the front of the DXU. The connector is marked GPS. This interface also supplies power to GPS receiver.



2-11

Local/Remote

Fault Operational LocalRBS FaultExt. Alarm

DXU reset

Port A Port B Port C Port D

Local/Remote

Fault Operational LocalRBS FaultExt. Alarm

DXU reset

Port A Port B Port C Port D

ESB

This interface is used to synchronize several transceiver groups inthe same cell, for example, when one cell is made up of more than one RBS.

The interface is accessed on the front of the DXU through two RJ-45 connectors marked ESB 1 and ESB 2.

OMT

The OMT port is used to communicate with the

The OMT is connected through a 9-pin D-sub connector and isgalvanically separated from the DXU. All signals use RS-232levels.

INDICATORS AND SWITCHES

Local/Remote

FaultOperationalLocalRBS Fault

DXU reset

Port A Port B Port CPort D

Figure 2-11. Distribution Switch Unit - DXU 31 - Indicators and



2-12

Label ColorFault RedOperational GreenLocal YellowRBS fault YellowExt. alarm Yellow

Port A Green

Transmission Port B GreenPort C GreenPort D Green

Table 2-1 DXU Interfaces

DXU reset Resets the DXULocal/remote Sets local/remote mode

Table 2-2 DXU Switches



2-13

DOUBLE RADIO UNIT The DRU is the interface between the Y links coming from theDistribution Switch Unit (DXU) and the antenna system. The DRU consists of two Transceivers (TRX), a combiner and distribution system, and a filter system.The DRU interface also supports both GSMK and 8-PSK (EDGE)modulation.The DRU has a hybrid combiner that can be used to combine thetwo Transmitter (TX) terminals into one terminal. Through software configuration, DRUs can operate in either combine modeor uncombined mode. Each TX terminal has an in-built bias injector that, when connected to the Tower-Mounted Amplifier Control Module (TMA-CM) can supply the

Two transceivers in one unit

GSM 900P, 900E or 1800 MHz

Supports 8-PSK (EDGE) and GMSK

Flexible radio configurations- Internal hybrid combiner- TCC support – double output power- Four Branch Receiver Diversity- 2 Duplex filters- 2 internal Bias-Ts

Figure 2-12. Double Radio Unit (DRU) General

Function Description

The DRU consists of the following main

Central Processing Unit (CPU) system Digital Signal Processor (DSP) system Radio control system Radio system Combiner and distribution system Filter system



2-14

Figure 2-13. Double Radio Unit (DRU) - Block

CPU SYSTEM

The CPU system controls the RBS. It consists of a CPU, supportlogic, memory, and logic for handling the interfaces.

DSP SYSTEM

The two DSP systems perform all the baseband signal processingnecessary for one TRX. For downlink, this includes Terrestrial Protocol Handling(TPH), encoding, ciphering,

and burst generation. For uplink, it includes equalization, combining, decoding, and TPH.

RADIO CONTROL SYSTEM

The two radio control systems are responsible for the

Synchronizing and controlling the different parts of the radio

Modulation and Digital-to-Analog (D/A) conversion of the datato transmit

Filtering the received radio signal with a channel-selective filter

Compensating the Receiver (RX) and TX delay and gain variations



2-15

The RC system is seen by the rest of the RBS as the front end tothe radio, which can be asked to transmit a burst of data, using a selected modulation, or asked to receive a burst, using a selected digital filter.All time critical radio control functions are performed by the RCsystem and no computing support is required from the CPU system on a real-time basis.

RADIO SYSTEM

Each radio system contains two radio receivers and one radiotransmitter including power amplifiers.The radio receiver receives RF-modulated uplink data from one ortwo diversity branches and sends it to the RC system.The radio transmitter generates the RF downlink signal from themodulated baseband signal. It then sends the RF signal to the power amplifier, which amplifies the downlink RF signals.

COMBINER AND DISTRIBUTION SYSTEM

The combiner and distribution system handles the routing of theTX and RX signals between the radio system and the filter system. The hybrid combiner connects one or two transmitters to one antenna through software-controlled relays. The DRU can be configured to operate in Hybrid Combined (HC) or Uncombined(UC) mode. The RX signal can be distributed to several other receivers by different switch setting to minimize the number of RX antennas, for RX sharing, or for 4-Way Radio Diversity

FILTER SYSTEM

The filter system filters the TX and RX signals, the filtering of theRX signals and duplexes them to a common antenna port. The filter system also contains the bias injectors that provide power supplier

INTERFACES

The operator interfaces of the DRU are described in the followingsubsections.



2-16

DC inY Link TMA PWR 1

TX/RX1

RX out 1 and 2

TMA PWR 2TX/RX2

RX in 1and 2

Figure 2-14. Double Radio Unit (DRU) -

Signal and Power Interfaces

Interface DescriptionDC in Input power to the DRUY link Interface between DXU and DRUTX/RX1 Connection to the antenna feeder for TX or TX/RXTX/RX2 Connection to the antenna feeder for TX or TX/RXRX in 1 RX input from another DRURX in 2 RX input from another DRURX out 1 RX output from TX/RX1 to share with other DRUsRX out 2 RX output from TX/RX1 to share with other DRUsTMA PWR1 Power and control for the TMA connected to TX/RX1TMA PWR2 Power and control for the TMA connected to TX/RX2

Table 2-3 Interfaces



2-17

DRU Reset

FaultOperational

RF Off

Local

Local/ Remote

DRU Reset

FaultOperational

RF Off

Local

Local/ Remote

INDICATORS AND SWITCHES

DRUReset

FaultOperational

RF Off

Local

Local/Remote

Figure 2-15. Double Radio Unit (DRU) - Indicators and

The tables below list the indicators and switches of the operatorinterface.Indicator ColorFault RedOperational GreenRF off YellowLocal Yellow

Table 2-4 Indicators

Switch FunctionDRU reset Resets the DRULocal/remote Local or remote mode

Table 2-5



POWER The Power System of the RBS 2X16 is composed

ACCU or DCCU

PSU

IDM

ACCU DXUDRU 1- 6

orDCCU

PSU 1-2 IDM TMA-CMFCU

Figure 2-16. Power

Optionally, it is possible add a Battery Backup System (BBS2X16).

AC CONNECTION UNIT –

ACCU-06 FOR RBS 2116 GENERAL INFORMATION

The ACCU-06 is a variant of the AC Connection Unit (ACCU).ACCUs distributes primary power to Power Supply Units (PSU).

Terminates incoming

AC power cables Distributes AC power

to the PSU Protects against

power line disturbances

Figure 2-17. AC Connection Unit - ACCU-06 for RBS



2-19

MAIN FUNCTIONS

The

Terminates incoming AC power cables

Distributes AC power to the PSU

INTERFACES

The ACCU has the following

Terminal block for five incoming AC power cables

Four outputs for PSUs

One output for a CLU

One outgoing connector as AC output service outlet

One RCB for service outlet

One main switch

Five circuit breakers for PSUs and a CLU

AC OutputService Outlet

Four Output forPSU

Circuit Breakers

Figure 2-18. AC Connection Unit (ACCU-06) -


2-20Issued by BRBRAITT ,Jabalpur in SEPT-209

ACCU-12 FOR RBS 2216 GENERAL INFORMATION

The ACCU-12 is a variant of the AC Connection Unit (ACCU).ACCUs distributes primary power to Power Supply Units (PSU).

Terminates incoming AC power cables Distributes AC power to the

Figure 2-19. AC Connection Unit - ACCU-12 for RBS

The ACCU has an AC interface for PSU-ACs, which converts ACto DC.

INTERFACES

The ACCU-12 has the following

Terminal block for three incoming AC power cables

Three outgoing cables to the PSUs

Figure 2-20. AC Connection Unit (ACCU-12) -



DC CONNECTION UNIT (DCCU-The DCCU-12 is a variant of the DC Connection Unit (DCCU).DCCUs distribute primary power to Power Supply Units (PSU).

Terminates incoming DC power

Distributes DC power to the

Figure 2-21. DC Connection Unit (DCCU-12) - General

MAIN FUNCTIONS

The

Terminates incoming DC power cables

Distributes DC power to the PSU



INTERFACES

The DCCU has the following interfaces:

Terminal block for three incoming DC power cables

Three outgoing cables to the PSUs

Figure 2-22. DC Connection Unit (DCCU-12) -



POWER SUPPLY UNIT DC (PSU-DC-The PSU-DC converts incoming DC power ranging from -57.6 to -40.5 V DC to the regulated DC voltage of +27.2 V DC. The maximum output power is 1500 W.

The PSU-DC consists of the following

main units: Control and supervision circuits

Supplies the correct DC voltage to the

RBS

Sends alarms to the Distribution

Figure 2-23. Power Supply Unit DC (PSU-DC-31) - General

MAIN FUNCTIONS

The PSU

Supplies the correct DC voltage to the RBS

Sends alarms to the Distribution Switch Unit (DXU)

Indicates local alarms



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