ERICSSON MMU PDF

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Published on Dec 17, SlideShare Explore Search You. Submit Search. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Ericsson mini link hc technical description. Upcoming SlideShare. Like this document? Why not share! Embed Size px. Start on. Show related SlideShares at end.

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For ordering information refer to the latest revision of the Product Catalog, see section 1. The combined expertise of Ericsson, covering switching, cellular technology, radio and networking provides excellent turnkey project management. It has proved to be a reliable communication medium, a highly competitive alternative to fiber cable.

Below follow some examples of typical applications. Microwave radio is by far the most preferred solution for transmission in access networks, providing reliability, cost efficiency and fast network rollout. Core and access networks 9. The access points are typically located at small and medium sized enterprises that require high-speed IP applications and voice services. Business access network References are made using the document name in Italics.

System components A terminal is one side of a microwave radio link hop, between two geographical locations. The terminal consists of an indoor part and an outdoor part. Apart from the main units, the system offers a number of well-adapted auxiliary units and accessories, both hardware and software. Refer to the Product Catalog for more information. One MMU per radio unit is required. It also contains a protection switching function used for protected terminal configurations.

At least one TRU per terminal is required. One or two terminals can be integrated into one common AMM. The cooling air enters at the front of the AMM, flows between the units and out through openings at the back of the magazine on both sides of the backplane.

RAUs with integrated antenna The outdoor units of a terminal are briefly described below. Antenna The compact antenna combines high performance with minimum outdoor visibility. The antenna is normally installed integrated with the antenna but a separate installation is also possible. Radio Cable The radio cable, which connects the RAU to the MMU, is a single coaxial cable carrying full duplex traffic, DC supply voltage and service traffic as well as operation and maintenance data.

The power splitter is available in a symmetrical and in an asymmetrical version. An integrated power splitter is also available. All external connections are made at the unit fronts.

The RAU and the antenna are easily installed on a wide range of support structures. The RAU is fitted directly to the antenna as standard, but can also be installed separately and connected by a flexible waveguide. In both cases, the antenna is easily aligned and the RAU can be disconnected and replaced without affecting the antenna alignment.

The interconnection between the outdoor part and the indoor part is the radio cable carrying full duplex traffic, DC supply voltage, service traffic as well as operation and maintenance data. Outdoor installation 1. Separate installation 2. Integrated installation The configuration parameters for the equipment are stored in a non- volatile memory in the TRU. Both RAUs are receiving signals. The TRU selects the best received signal according to alarm priority lists.

See also section 6. In hot standby mode, the terminal can be configured for space diversity, placing the receiving antennas at a mutual distance where the impact of fading is reduced.

Receiver switching due to fading in space diversity configurations is hitless. The same signal is transmitted at two different frequencies under the assumption that multipath fading flat or selective phenomena that affect one frequency will not affect the other one. The TRU selects the best received signal according to the alarm priority lists.

In working standby mode, the terminal is configured for frequency diversity with space diversity as an option. On the radio side, it uses a single frequency hot standby configuration. In this mode the radio section performs protection switching on the transmitter side.

Receiver switching in the TRU is disabled. The ADMs at both ends carry out the receiver protection switching. Traffic paths in an unprotected terminal Transmit power control 2. A value Pset is manually set, in 1 dB increments, locally or remotely from the management system. The output power is continuously adjusted in order to maintain a minimum input level set from the LCT at the far-end terminal.

The receiver input level at the far-end and the maximum transmitter power level Pset are set, locally and remotely from the management system. Under normal path conditions the ATPC maintains the output power at a reduced level resulting in a lower interference level in the radio network. A web based interface, similar to the one in the LCT, can be launched enabling certain configuration facilities. The change to the new revision is then handled from the LCT.

The RAU can be combined with a wide range of antennas in integrated or separate installation. The RAU is a weatherproof box painted light gray, with a handle for lifting and hoisting. There are also two hooks and catches to guide it for easier handling, when fitting to or removing from an integrated antenna.

It comprises a cover, vertical frame, microwave sub-unit, control circuit board and filter unit. The microwave sub-unit consists of a microstrip board with an aluminum cover that provides shielded compartments for the high-frequency circuits.

The control circuit board, which holds the control and supervision processor, is fitted at the back of the microstrip board. The RAU connects to the antenna at the waveguide interface. Disconnection and replacement of the RAU can be done without affecting the antenna alignment. Radio Cable 1. The connector is equipped with gas discharge tubes for lightning protection Grounding 2.

Test port for antenna alignment LED Indicators 4.

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