omd1100 bts312 hardware structure issue2_0
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OMD1100
BTS312 Hardware StructureISSUE 2.0
OMD1100
BTS312 Hardware StructureISSUE 2.0
Wireless Training Department
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Contents
Part 2: Basic Operational
Principle of BTS
Part 1: Overview
Part3: Antenna Feeder
system
Part 4: Assistant System
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General introduction to BTS312
Part1: Overview
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MSC: Mobile Switching Center BSC: Base Station Controller SMC: Short Message Center
HLR: Home Location Register BTS: Base Transceiver Station VM: Voice Mailbox
AUC: AUthentication Center MS: Mobile Station OMC: Operation/Maintenance Center
VLR: Visitor Location Register EIR: Equipment Identify Register
Other MSC/VLR
MAP
M900 BTS
M900 BTS SMC&VMOMC
M900/M1800 BSC
TUP, ISUP
MAP
A interface
X.25/ LANX.25/ LAN
MSHLR/AUC/EIR
M900/M1800 MSC/VLR
M1800 BTS
M900 BTS
PSTNISDNPSPDN
Um interface
MS
Features and Function
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Features and Function
High integration and low power consumption
15 radio carriers at the Abis sharing an E1 for
transmission (15:1)
Integrating optical transmission equipment,implementing optical fiber to BTS
Supporting the configuration of up to S24/24/24
and facilitating expansion
1-minute fast startup
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Dual-Band frequency systems
Supporting short message cell broadcast
and point to point short message
GSM PHASE I/PHASE II and GPRS
Supporting baseband hopping
and RF hopping
Supporting the EFR and DTX
Supporting A5 encryption and decryption
Features and Functions
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FAN BOX
SWITCH BOX
FAN BOX
AIR BOX
AIR BOX
P
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TD U
Common
equipment
TRXCDU
air/fan
BTS312 Cabinet and Boards:
CDU: combiner & divider unit
TRX: transceiver module
PMU: power monitoring unit
TMU: Timing/Transmission &
Management Unit
PSU: power supply unit
TES: transmission extension
power supply unit
TEU: transmission extension unit
TDU: time distribution unit
BTS312 Cabinet and Boards
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Hardware structure of BTS312
DATA BUS/CONTROL_BUS/TIMING_BUS
Externalcontrol
Externalalarm
E1TMU
Opt. fiber
xDSL CDU
PMU
FH_BUS
CDU
PSU
TRX
TRX
TRX
TRX unitCommon unit
CDU
CDU
To antenna
To antenna
To antenna
Antenna feeder unit
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Operational Principle of BTS312
Part2:
Basic Operational
Principle of BTS
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BTS Logical Structure
DATA BUS/CONTROL_BUS/TIMING_BUS
Externalcontrol
Externalalarm
E1TMU
xDSL CDU
PMU
FH_BUS
CDU
PSU
TRX
TRX
TRX
TRX unitCommon unit
CDU
CDU
To antenna
To antenna
To antenna
Antenna feeder unit
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TMU
BSC
External synchronous clock
MMI man-
machineinterface
External
Alarming
control
BIU
OMU
EAC MCK
Standby MCK
Extended BIU
DBUS Internal data bus
CBUS Internal control bus
TDUInternal
clock bus
qFunction:
Timing
Transmission
Management
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BSC
External synchronous clock
MMI man-
machineinterface
External
Alarming
control
BIU
OMU
EAC MCK
Standby MCK
Extended BIU
DBUS Internal data bus
TDUInternal
clock bus
CBUS Internal control bus
Interfaces of TMU
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Panel of TMU
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TRX Module Structure
DBUS
TIMING_BUS
SCP CUI
Clock processing part
TBPU
DSP
FH_BUS
TDP PAU
RCU
send Main
RPU
receiver
Diversity
receiver
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Power amplifier unit (PAU) (output 46dBm/APC)
Over standing wave alarm: Over-temperature alarm:
Function of TRX
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DBUS
TIMING_BUS
SCP CUI
Clock processing part
TBPU
DSP
FH_BUS
TDP PAU
RCU
send Main
RPU
receiver
Diversity
receiver
Interface of TRX
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Please press button to continue your study.
Panel of TRX
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Tran
sceiver
Combin
er&
dividerunit
Lightning
arrester
Lightnin
g
arrester
TTA(optional)
TTA(optional)
CDU and Antenna System
Transceiving
antenna
Diverse
Receiving
antenna
Part 3 Antenna-feeder System
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Combiner
Distributor
Distributor
CouplerTX1
TX2
TX-COMBTX-DUP
RX1RX2RX3RX4
HL-out
RX2RX3RX4
RX1
HL-in
RXD
TX/RX-ANT
RXD-out
CDU
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Standing wave testing function:
When the tested standing wave exceeds the preset
threshold (1.5:1 or 2.5:1), CDU will givecorresponding alarms and indications.
Testing the internal amplifier and the tower amplifier,CDU reports the alarms to TMU.
Alarm Test
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Tx_Comb
TX4
TX3
TX2
TX1
3dBBridge
3dB
Bridge
3dB
Bridge
Four carriers are combined and output through 3dB
bridges and the plug loss is 6.8dB.
SCU
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Antenna gain
Antenna Pattern
Polarization
Diversity technology
Antenna Technology
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Antenna gain indicates the antenna feature of radiating
electromagnetic waves in specific directions.
Normally, the higher the gain, the stronger the far field strength.
A
B
GainA>GainB
Antenna gain
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The antenna pattern describes the radiating abilities ofantennas in all directions.
In the field of communication, this normally refers to the
horizontal pattern.
360Omni Antenna
120 90 65 Directional antenna
Antenna Pattern
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Two types of polarization:
Vertical polarization
Horizontal polarization
The types of antenna divided
by polarization:
Single polarization antenna
-Vertical polarization for GSM
-One port for one feeder
Bi-polarization antenna
+45 degree and -45 degree
Two ports for two feeders
Polarization
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Polarization diversitySave antenna
Space diversityd>10 x wavelength
Frequency diversity
Frequency hopping
Types of
diversity:
Diversity technology
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There are several forms for the main feeder:
7/8 inch
CABLE LOSS=0.043dB/m
5/4 inch
CABLE LOSS=0.032dB/m
1/2-inch super-flexible jumpers
CABLE LOSS=0.11dB/m
Used between the antenna and the main feeder
Between the antenna and the booster
Between the cabinet and the lightning arrester
Feeder
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BSC
BSC
BSC
TDU
TDU
TDU
TMU
TMU
TMU
DBUS
TBUS
CBUS
TRX
TRX
TRX
CDU Antenna
Traffic signaling
Clock signaling
Control signaling
Process of BTS
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Function:TimeDistributing Unit
Providing clock channels
in one synchronous cell
Transferring the E1 signals
in the local cabinet
Providing alarming channels
Bus connection
TDU
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P S U
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P S U
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P S U
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P S U
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Extension cabinet Extension cabinet
Extension cabinet group
Basic cabinet Basic cabinet
Basic cabinet group
Clock bus connection in a synchronous cell
Cabinet connection
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Three modes for BTS312 power supply:
Used for the AC power supply cabinet, with
the AC/DC module and batteries attached;220VAC
Used for the DC power supply cabinet with
the DC/DC module and no battery;-48VAC
Used for the DC power supply cabinet, with no
AC/DC module or DC/DC module, nor any battery;+24VAC
Power Supply
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AC/DC
(DC/DC)module
AC/DC
(DC/DC)module
AC/DC
(DC/DC)module
AC/DC
(DC/DC)module
Monitoring
unit PMU
Anti-lightning
Powerdistribution
EMI
filter
EMI
filter
EMI
filter
DC contacter
Battery group Fuse
220VAC IN
-48VDC IN+
-
+24VDC IN+
-26VDC OUT
Load
-
Power Supply System
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PMU (Power Monitoring Unit) structure
AC/DC AC/DC AC/DC AC/DC
AC power supply
Power monitoringunit PMUFan
Fuse
Battery
Load
PMU
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mode capacity (TRX) boards (PSU) boards (PMU) notes
24VDC 1~12 0 1
48VDC 1~3 2 1 One PSUfor backup.
4~6 3 1
7~9 4 1
10~12 5 1
220VAC 1~3 3 1
4~6 4 1
7~9 5 110~12 6 1
The configuration of PMU:
PMU
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Providing fan feed
Fan revolution
speed control
Alarm detection
Interfaces
24V power supply input
interface
Fan box power supply
input interface
Fan fault alarm termina
Fan Monitoring Unit (FMU)
FMU
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Transceiver
Combiner&
dividerunit
Lightning
arr
ester
Lightning
arre
ster
TTA(optional)
TTA(optional)
CDU and Antenna System
Transceiving
antenna
Diverse
Receiving
antenna
Lightning Arrester is used to prevent the equipment from being
damaged by the lightening current inducted by the core line of thefeeder.
Lightning Arrester
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The tower amplifier is installed next to the
receiving antenna.
It can be used to increase the receiving
sensibility of the base station.
consisting of:
Triplex filter
Low noise amplifier
TTA (Optional)
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The BTS room is unattended and distributed in large
area.
Component:
Environment alarm boxCollecting external environment parameters
through various sensors, report to TMU.
TMU
Collecting the alarm signal, performs corresponding
processing, and reports it to BSC.
Part 4 Environment Supervising
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Each BTS312 cabinet can accommodate 12 carriers.
When the number of cell carriers is over 12, multiple
cabinets need to be equipped, classified as main
cabinet and auxiliary (backup) cabinets.
One set of BTS312 equipment group can contain twocabinets (24 TRX).
For the maximum capacity site, there are three groups
with 72 TRX.
Main/Auxiliary Cabinet
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