FIRE BDA PPT

[Virtual Presenter] Good morning everyone. Today is a very exciting day and we are gathered to discuss the services our company provides for Distributed Antenna Systems and Leaky Coaxial Cables. We will be exploring why these technologies are becoming increasingly important in providing better signal coverage in Tunnels and Stations. Let's get started..

[Audio] Slide you are seeing is the Table of Contents for the meeting. We will be looking at the Working Principle of the BDA, Installation Steps, necessary Tools and Accessories, and Operation, Maintenance and Trouble shooting. Let's start with the Working Principle of the BDA..

[Audio] We use two main components for our Tunnels and Stations solutions: Leaky Coaxial Cables and Distributed Antenna Systems. The input signal sources we use are Tetra Base Transceiver Station (BTS) and Bi-Directional Amplifier (BDA). We offer installation services for passage level, platform level and undercroft level areas, thus enhancing signal coverage throughout the Tunnel or Station..

[Audio] We provide an essential service that prevents a world of lost connections, missed messages and dead spots from happening. Our Distributed Antenna Systems (DAS) are designed to ensure uniform coverage with the use of a set of low-power antennas connected strategically based on the area. The Telecomm Equipment Room (TER) is where these antennas pull their radio source from and subsequently distribute the output power to each floor. In tunnels, Leaky Coaxial Cable is used to distribute signal. Our mission is to make sure the signal remains of the highest quality no matter the area..

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[Audio] The Distributed Antenna Systems and Leaky Coaxial Cables must be used and taken care of with caution. It is important to never switch on the equipment without connecting it to an antenna or load. Also, the VSWR of the antenna should be below 1.5. Additionally, the yellow green wire needs to be connected to the building's grounding, or replaced with a proper grounding braided wire. Anti electric shock, anti lightning strike and electrostatic protection measures must also be taken. Be mindful when installing the equipment, as it can be heavy, and the upholder must be reliable and secure. Lastly, disconnect or switch off the backup lithium battery and equipment power supply module when modifying or updating it..

[Audio] This slide presents how a BDA works. A BDA has two main sides: a base station side and a mobile station side. The downlink signal, which is sent to the base station side, will go through a low-noise amplifier and an attenuator. The signal will then be amplified to the designated power by a power amplifier and transmitted to the mobile station side service antenna through an MS side duplexer. On the uplink side, the process is similar. The main purpose of a BDA is to amplify both uplink and downlink signals..

[Audio] This slide shows our state-of-the-art equipment used in the installation of distributed antenna systems and leaky coaxial cables. This advanced equipment enables us to provide reliable signal coverage in tunnels and stations with greater accuracy and precision. We have the resources necessary to complete these projects quickly and efficiently. Our team is proud to have the experience and knowledge necessary to ensure these projects are completed with the highest level of quality..

[Audio] The location of a wireless repeater, and the isolation between its antennas, are both critical for successful transmission of signals. Isolation refers to how well the antennas can separate the signals, and must be greater than the repeater's amplification power. This ensures that the repeater does not cause interference or disrupt the base station's functioning. To ensure a successful transmission, it is essential that careful consideration is given to the location of the repeater and the isolation between its antennas..

[Audio] It is essential to carefully select the location when installing a repeater. The terrain and landform of the area must be taken into account, as the repeater performance is connected to the isolation between its donor and service antennas. Isolation that is at least 15dB higher than the repeater gain guarantees the repeater will reach its maximum output power and lower the risk of self excitation and interference. To delve deeper into this point, we will focus on the importance of the right location selection..

[Audio] In order to ensure a reliable reception level of the signal, the parameters "Lo" and "Lm" need to be calculated. "Lo" is calculated using the formula 32.45 + 20log(F) + 20log(D), where F stands for the frequency and D for the distance. The calculation of "Lm" is slightly more complex and includes the following elements: 69.55 + 26.16log(F) - 13.82log(Ht) - attenuation caused by the height of the earth + 44.9 - 6.55log(Ht) + log(D), where Ht stands for the height of the building. The signal requirements for the repeater installation must be set so that the minimum reception level is greater than -69dBm, taking into account that it is determined by the maximum transmission, minus the gain of the antenna and the antenna system..

[Audio] Our services focus on providing optimal signal coverage in external areas such as tunnels and stations. Proper antenna placement is a key factor for successful wireless BDA applications. When installing antennas outdoors, careful selection of the location is necessary to prevent antenna angles from creating a less than 90 degree bend between the donor base station and service antenna. To maximize the effectiveness of the signal coverage, it is important to ensure the donor antenna and service antenna are not facing in the same direction..

[Audio] For a distributed antenna system to achieve optimal coverage, the particular properties of the station or tunnel it is being applied to should be thoroughly considered. These properties include the size, shape, material and number of antennas applied. Our engineers expertly assess the specific conditions of each tunnel or station and then design an antenna system that ensures the best possible coverage..

[Audio] The use of reflections of the environment, such as buildings and other structures, can help to circumvent the challenges posed by having a signal pass through intervening structures. This allows for an effective and dependable signal propagation in congested areas, where direct transmission might be impeded by the presence of obstacles. As a result, the end user is able to benefit from an unbroken communication experience..

[Audio] The recommended distance between the donor antenna and service antenna for BDA installation is 25 meters in order to obtain signal intensity above -69dBm. The antennae must be parallel to each other, facing each other without any obstructions in between. This positioning is vital for BDA installation success..

[Audio] When configuring a distributed antenna system or leaky coaxial cable, utmost care must be taken to properly manage and maintain the set-up. Not only must the antennas not emit in opposing directions, but the line connecting them must be vertical to the line connecting the base station and the blind area. Moreover, it is important that repeater gain should be 15dB less than the isolation. If there are any obstacles between the antennas, such as small houses, direct line of sight must be avoided. Depending on the material of the building, different solutions may be needed to reach the necessary isolation. For example, a donor antenna may be placed close to the building when it is armored concrete. If the material is brick or some other material, the distance should be increased and other objects used for the purpose of isolation. Finally, the platform on the tower can be used as an isolation barrier if available, with the antennas installed on the platform and lower down the tower. Heed must be taken to all of these points in order to ensure success..

[Audio] We will be discussing the tools and instruments needed for the installation of Distributed Antenna Systems and Leaky Coaxial Cables. It is essential to be familiar with the required tools and instruments to guarantee the installation is done accurately and efficiently. The tools used may differ depending on the situation and how complex the project is. Common tools include screwdrivers, pliers, nut drivers, cable puller, wire strippers, soldering iron, and signal meter. Using the right tools and instruments is essential in order for the successful installation of a Distributed Antenna System and Leaky Coaxial Cables..

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[Audio] A power supply of AC 220 volt ±10%, 45~55Hz, a donor antenna, and a service antenna is required for a successful BDA system installation. The antenna pole should be straightened, and the donor and service antennas should be installed following the provided instructions. The system should be mounted onto a wall, and the power cable connection should be securely connected. Once all components are correctly installed, the system should be capable of providing enhanced signal coverage for tunnels and stations..

[Audio] Repeater ports can be used in a range of applications such as cellular repeater networks, indoor wireless systems, distributed antenna systems, wireless voice backhaul, outdoor wireless access points, among others. Their use can expand coverage area and improve network performance in challenging environments such as urban centers, hilly terrain or underground facilities. Dead zones in hard to reach places can be eliminated, providing a superior network performance and reliability..

[Audio] An essential component of numerous distributed antenna systems is the BDA or base station amplifier. Usually mounted on a wall, it amplifies the signal and needs to be placed in a manner that maximizes its performance. Structural elements of the wall, its distance from other components, and the security of the device need to be taken into account. Our experienced technicians ensure that your BDA is mounted on a wall that meets all your requirements..

[Audio] Operational and Maintenance Troubleshooting (OMT) services include a vital part of debugging Repeaters. Troubleshooting the various components of a Distributed Antenna System (DAS), such as Repeaters, is an essential aspect of setting up a successful device. We take pride in offering professional debugging services for Repeaters, ensuring that all DAS components are fully functional. We remain committed to granting our customers with the highest quality services..

[Audio] A visual example of the services our company provides is depicted in this slide. It contains text, a font, a receipt, and some algebra, highlighting the extensive scope of solutions that we offer in order to maximize signal coverage. Our proficiency allows us to comprehend and meet all customer needs..

[Audio] Ensuring the power source to the repeater is working efficiently is essential for successful maintenance and trouble shooting of Distributed Antenna Systems and Leaky Coaxial Cables used in Tunnels and Stations. Proper equipment earthing and mounting durability are also critical. Checking the input signal level to BDA, donor antenna and the feeder cable conditions is also imperative. Lastly, parameter setting and alarms for OMT must also be set correctly. Thank you for your attention..