Distributed Antenna Systems for Indoor cellular network, cable splitter
Some 70-80% of mobile traffic from buildings. This is particularly true in urban areas, where the focus of the mobile user is at high speeds. For the 3G mobile network, the only macro-base station used in a few hundred meters from the building can provide enough RF signal to support the internal voice and data services. In reality, few buildings that fall into this category. Soft Handover in 3G networks continue to increase the traffic load on the network, because each indoor unit of the phone can be maintained as a macro-cells (base stations). To provide internal services to high-speed data, such as HSPA (High Speed Packet Access) and EVDO (Evolution – Data Optimized) services, the only solution is a blanket component video splitter, Distributed Antenna Systems (DAS).
DAS will deliver used to distribute the RF signal of sufficient strength even within a building to 3G voice and data services. DAS can component video splitter isolate the internal network, external Serve the macro cells for the elimination of smooth transition of the inner cell. This reduces the payload and increase the speed of the 3G network. For HSPA high speed data services can also cover DAS separation between service and no cell service in the external network. This means less co-channel interference in cell HSPA active and leads to higher rates for HSPA data service. Sun dominate the buildings with indoor directional antennas can be used for Edges and building towards the center of the building. Inside the interior is dominated cell, minimizing the losses to the network macro.
THE deploy a single dominant RF signal inside the building shall, by splitting the signal from the base station to cover various internal antennas to cover the whole house. Groups can be divided passively or actively. SAAD passive uses passive components for RF distribution Signal. These passive components are coaxial cables, splitters, terminators, attenuators, circulators, couplers and filters (duplex, diplexer and triplexer). The planning is to calculate the maximum loss from the base station for each antenna systems and makes the link budget component video splitter for the area covering each antenna. The passive design DAS must adapt to the limitation of building restrictions on where and how heavy the coaxial cable can be installed. A detail page Survey of construction would be needed to ensure that there are lines of cable component video splitter, to all antennas.
Active DAS the ability to automatically compensate for cable loss and cross-linking of the components in the system of internal calibration signals and amplifiers. No matter what the component video splitter distance between the antenna and the base station, all the antennas in an active DAS uses the same power (have the same noise figure performance and downlink). Active DAS consists of a Master unit (MU), connected to multiple expansion units (EU) with the fiber up to 6 km in length. Each EU turns to connect to multiple remote units (RU), thin coax or CAT5 cable up to 400m in length. The MU controls and monitors the performance of DAS. EUS are scattered throughout the building and utilities are installed near the antenna. A DAS Active broadband radio services, GSM, PCS, UMTS, EVDO, WiMAX and Wi-Fi.
Because of the loss and mitigation coaxial cable and passive components, passive DAS is used in smaller buildings covers a limited number of internal antennas to its degrading effect on performance HSPA minimized. For larger buildings, DAS is actively used, since they do not have cable and components and can cause loss of performance HSPA for maximum support. Troubleshoot DAS person is difficult, and all errors in the system has not raised an alarm to the base station, as there is no monitoring of errors System. Active DAS controls all system devices and component video splitter in case of malfunction, an component video splitter, alarm will be the base station that can send and locate the user, the cause of the problem. Therefore, active DAS is the preferred solution for the construction component video splitter of many large indoor antennas.
Paul Ngai is an engineering company in the component video splitter telecommunications networks and specialized component video splitter, systems. He is also the principle of component video splitter, Network Systems Technologies, LLC (http://www.nstecs.net), a telecommunications consulting firm that provides planning, analysis, design, testing and support services component video splitter operations.
By: Paul Ngai
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