As the key equipment of mobile base station communication, RRU (remote radio unit) and BBU (base band unit) are logically close to each other. The RRU downlink is connected to the antenna through a coaxial cable and a corresponding passive device, and the uplink is connected to the BBU through an optical fiber to obtain a signal through the CPRI protocol. Generally, one BBU can be connected to multiple RRUs. In the actual application site, because of the different hardware designs of different manufacturers and other different factors, the hardware connection mode of the intermediate optical fiber will be different, and the length will also be different due to the field situation. The location of our on-site construction personnel in the following figure is basically between RRU and BBU, and the longest distance is more than 100 meters.

Live shooting

The original connection method is that each RRU has a separate optical fiber to the BBU. The advantage of this is flexibility and convenience, but the disadvantage is that there are many cables and the time-consuming and costly consumables. In order to optimize material cost control and reduce the installation time of on-site construction personnel, there are different Trunk outdoor waterproof multi-core optical cable assembly schemes. The lower left figure shows the direct connection scheme of Trunk outdoor waterproof multi-core optical cable assembly. Only one main Trunk outdoor waterproof multi-core optical cable assembly is required from BBU to RRU. The difficulty of this is to do a good job in the early stage of each site survey, especially at the RRU end. If the details of the equipment are not clearly confirmed, or the relative position is mapped with deviation, it will cause the field installation to not match the situation. The following figure is an improved scheme, which solves the problem of direct scheme by adjusting the increased outdoor optical jumper. This is a relatively recommend scheme at present. The outdoor optical jumper and Trunk outdoor waterproof multi-core optical cable assembly are connected through outdoor weather-resistant optical fiber connectors. The lower right figure is also an improvement to the direct connection scheme. Here, an outdoor optical fiber distribution box is used to protect the docked optical fiber connectors. Because of the protection of the box, the optical jumper and the optical fiber connectors used on the Trunk outdoor waterproof multi-core optical cable assembly can be used in the most regular application.

These are just simple models, but the actual situation on site is often like this, as shown in the figure below, the tower is high, there are many equipment, many lines, and the operating space is limited. Considering the influence of wind speed, the construction difficulty of on-site personnel can be imagined.

In order to solve the installation problem of base station field workers, Rosenberg developed a new type of multi-core outdoor fast-connect fiber optic connector, RMC and Q-RMC. Mainly from the following points to solve the problem:

· Small size

· Light weight

· More cores

· Reliable connection

· Plug and play

In particular, the Q-RMC plug self-locking, 2 seconds to achieve docking structure design, for the installation of a large number of reduced man-hours.

The above Q-RMC products, the typical product application scheme is shown in the following figure, in the tower-mounted optical fiber TMFS system (Tower Mounted Fiber System), can achieve the base station tower on the large number of cores of optical fiber connection requirements.

Rosenberg has a wide range of electrical and fiber optic connector solutions designed to meet the needs of the most innovative and challenging applications. If you are interested in obtaining more information about these products or any other products, please do not hesitate to contact one of our experts to clarify any questions you may have or provide any guidance you may need for your deployment project.

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