Like a server cabinet The BTS3012 cabinet is purple gray in color and vertical in appearance.
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Transcript of Like a server cabinet The BTS3012 cabinet is purple gray in color and vertical in appearance.
![Page 1: Like a server cabinet The BTS3012 cabinet is purple gray in color and vertical in appearance.](https://reader030.fdocuments.in/reader030/viewer/2022032701/56649c7d5503460f94932b36/html5/thumbnails/1.jpg)
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Introduction to Base Transceiver Station (BTS) and Its Cards
LAB # 6
Engr. Mehran Mamonai
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Appearance of BTS3012 Cabinet
Like a server cabinet
The BTS3012 cabinet is purple gray in color and vertical in appearance
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Physical Structure of the BTS3012
The components are
1. Transmission subrack2. Common subrack3. DTRU subrack -04. Fan subrack5. DTRU subrack-16. DAFU subrack 7. Power distribution unit 8. Signal lightning protection subrack
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Transmission sub-rack
located below the common sub-rack. Reserves space for the baseband unit
(BBU).› Such as SDH,› microwave transmission equipment
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Common subrack
Common subrack The common subrack is installed below the
fan subrack. It holds the following parts:› DTMU › DEMU › DATU › DCSU › DCCU › DABB › DPTU
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DTMU
Dual Transmission or Timing Management Unit
an entity for basic transmission and control in the BTS3012.
It works as a main controller. The DTMU is a mandatory module
inserted in slots 0 and 1 (from left to right)
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DTMU (cont.)
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DEMU
Dual Environment Monitoring Unit The DEMU performs the following
functions:› Monitors the environment information sent
from the smoke sensor, water sensor, temperature and humidity sensor, infrared sensor, and door control sensor
› Collects alarm information and reports it to the DTMU
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DATU
Dual Antenna and TMA Control Unit
Controls the RET antenna Feeds power to the TMA
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DCSU
Combined cabinet Signal connection Unit is placed in slot 5 of the common sub-rack
The DCSU is a mandatory board The DCSU performs the following functions:
› Transmits clock signals, data signals, and control signals between the main cabinet and the extension cabinet
› Transmits the clock signals, data signals, and control signals from the DTMU to the DTRU
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DCCU
Cable Connection Unit is placed in slot 6.
The DCCU is a mandatory board. The DCCU performs the following
functions:› Transfers E1 signals › Transfers the control signals for the fans › Transfers the clock signals from the DAFU
subrack
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DPTU
Packet transmission unit can be installed in slot 3 or 4
The DPTU is mandatory The DPTU performs the following
functions:› Provides the interface for Abis over IP › Provides the BTS with the convergence
function of a Hub › Provides the functionality of Clock Over IP
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DTRU subrack
The DTRU subracks can hold up to nine DTRUs
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DTRU
Double-Transceiver Unit (DTRU) is placed in the double-transceiver subsystem of the BTS.
One DTRU consists of two TRXs Baseband Processing Part
› The baseband processing part performs the following functions:
› Processing signaling, coding and decoding, interleaving and de-interleaving, modulation and demodulation
› Supports RF loop test and switchover of the faulty phase-locked loop
› Amplifying output power
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DTRU (cont.)
RF Transmitting Part› The transmitting part of the RF signals performs the
following functions:› Modulates the baseband signals into RF signals and
performs up-conversion, filtering, and RF hopping › Amplifies and outputs the RF signals
RF Receiving Part› The receiving part of the RF signals performs the
following functions:› Demodulates the RF signals into baseband signals and
performs RF hopping › Divides the received RF signals and performs receive
diversity
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Fan subrack
The fan subrack holds one fan box a fan monitoring board consists of four
fans. The fan monitoring board detects the
temperature at air inlets at bottom of the cabinet and automatically adjusts the fan speed
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DAFU subrack
Antenna Front-end Unit The DAFU subrack can be configured
with› DDPU› DCOM› DFCU or DFCB.
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DDPU
Dual-Duplexer Unit The DDPU performs the following
functions:› Provides lightning protection through the
ANT port › Detect VSWR alarms in the antenna system › Control the gains for the receive low noise
amplifier › Transmits multiple routes of RF signals
from the transmitter to the antenna
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DCOM
Combining Unit The DCOM combines two routes of TX
signals from the DTRU, and then sends them to the DDPU
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Power Distribution Unit
The power distribution unit consists of the › DC lightning arrester,› EMI filter,› PGND bar,› Busbar terminal socket (top)› Busbar (right)
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Lightning protection subrack
The signal lightning protection subrack is installed on top of the cabinet. It is configured with the following boards:› DMLC › DELC › DSAC
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DMLC
Monitor Signal Lightning-Protection Card The DMLC performs the following
functions:› Provides lightning protection for Boolean
input and output signals › Provides lightning protection for analog
signals that are transmitted from the smoke sensor, water sensor, door control sensor, infrared sensor, humidity and temperature sensor
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DELC
E1 Signal Lightning-Protection Card The DELC performs the following
functions:› Provides lighting protection for E1 signals
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DSAC
Signal Access Card
The DSAC performs the following functions:› Provides six Boolean alarm inputs › Provides lightning protection for BITS clock
signals
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