Diplexer Diplexers
Diplexer Diplexers
Approximately 70 – 80% of mobile traffic from inside buildings. This is particularly true in urban environments, where the emphasis the mobile user is at high flow rates. 3G mobile network serves only the macro base station a few hundred meters of the building can provide enough RF signal level to support the inner voice and data services. In real estate, only a few buildings fall into this category. Soft handover in 3G network will grow even more traffic load on the network, since each mobile phone can be serviced within several macro cells (base stations). To provide high speed in the mobile data services, such as speed HSPA (High Packet Access) and EV-DO (Evolution – Data Optimized) services, the only solution is an indoor Distributed Antenna Systems (DAS).
DAS is used to distribute the RF signal uniformly fairly high in a building to provide 3G voice and data. DAS can be used to isolate the internal network from outside the macro cell which eliminates the transfer soft phone inside. This will reduce traffic load and increase the speed of network 3G. For HSPA high-speed data, the DAS inside can also provide isolation between the service and not use the cell network abroad. This means less co-channel interference in the HSPA acting on the cell and results in higher rates for the HSPA. To dominate the building with indoor coverage, directional antennas can be installed on the edges and corners of the building and pointing towards the center of the building. The total covered area is dominated by the internal cell while minimizing the leakage of the macro network.
DAS RF signal uniformly distributed dominating the building by dividing the signal from the base station within several antennas inside to ensure coverage throughout the building. DAS can be classified as passive or active. DAS Passive passive components used to distribute the RF signal. These components are passive cable coaxial splitters, terminators, attenuators, circulators, couplers and filters (duplex or diplexer Triplexer). Planning DAS includes the calculation of the maximum loss the base station for each antenna systems and link budget not from the area in particular that each antenna covers. The design of passive DAS must adapt the restriction of building restrictions in regard to where and how heavy coaxial cable can be installed. An investigation into the details of the location the building had to be done to ensure that there are traces of all cable antennas.
Active DAS has the ability to automatically compensate loss of cables interconnecting the components in the system using internal calibration signals and amplifiers. Whatever distance between the antenna and base station, all the antennas in an active DAS has the same performance (noise figure and power itself down). DAS Active consists of a central processing unit (MU) connected to multiple expansion units (EU) with the fiber optics up to 6 km long. Each becomes the EU is connected to control units to multiple remote (UK) with coax or CAT5 cable up to 400 meters long. The MU control and monitor the performance of the DAS. EUS are distributed throughout the building and the railways have been installed near the antenna. The DAS Broadband Radio active support multiple services, GSM, PCS, UMTS, EVDO, WiFi and WiMax.
Because of the loss and attenuation in the cable and coaxial passive components, the passive DAS is used in a small building covered by a small internal antenna to maintain its degrading effects on performance minimum of HSPA. For large buildings, active DAS is used because it has no cable and loss of components and can improve performance of HSPA as possible. Troubleshooting passive DAS is difficult and all the failures in the systems do not blow the whistle to the base station, because there no monitoring of system errors. DAS Active monitors all system units and in case of malfunction, an alarm is sent to the base station that allows the operator to identify the source of the problem. Therefore, the active DAS is the preferred solution for large building with many internal antenna.
About the Author:
Paul Ngai is an engineering consultant specialized in Telecommunications Network and Systems. He is also the principal of Network Systems Technologies LLC, a telecommunications consulting firm provides planning, analysis, design, testing and operation support services.
Article Source: ArticlesBase.com – Distributed Antenna Systems for Indoor Cellular Network
How do I properly connect my diplexer / splitter?
I have an "antenna" in duplexer. It has three connections TV, SAT, and a third of the said TV / SAT. I connect so I can have a television in another room, watching the same program as the fourth to have the receiver installed. He had earlier this duplexer installed on my line and it worked well. Now I can not remember how it was UPS hook. When you are logged previously had two diplexers. One person in line, satellite and one in the room where the receiver is. Both crossovers have television, satellite and TV / SAT entrance The SAT has an arrow to the TV / SAT and says "DC Pass. Can anyone help me how to tie specific inputs, orbiting satellites online and then in the room (hook up to enter the device) ..
e-mail @ i uscgaux36@aol.com me or talk through what I need more information includes the phone number or email me or mine
TV/Sat Diplexer
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