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首页 > Home > Application Notes > Why Optical Modules for CPRI Applications Need to Support Industrial Temperature RangesWhy Optical Modules for CPRI Applications Need to Support Industrial Temperature Ranges
Time: 2020-02-20
Optical modules used in Remote Radio Units (RRUs) for CPRI applications are required to support industrial temperature ranges, primarily because RRUs operate in diverse outdoor environments with extreme temperature variations.
CPRI (Common Public Radio Interface) defines the interface relationship between a base station's data processing and control unit and its transceiver unit. Its data structure can be directly applied to the remote transmission of repeater station data, making it a critical component of a base station's remote radio system.
In 4G wireless networks, the two core units of the CPRI architecture are the BBU (Building Baseband Unit, indoor baseband processing unit) and the RRU (Remote Radio Unit). Optical modules deployed in 4G wireless networks are mandated to support industrial temperature ranges. A brief analysis is provided below.
Diagram of BBU-RRU Connection in 4G Wireless Networks
The figure below shows a typical BBU-RRU connection topology. The BBU is located inside a climate-controlled equipment room, while the RRU is usually mounted on outdoor telecom towers.
Figure 1: Diagram of BBU-RRU Connection
The BBU operates in a temperature-controlled indoor environment with air conditioning maintaining a stable room temperature. In contrast, the RRU is exposed to the unregulated outdoor elements, where temperatures fluctuate drastically.
For example, outdoor temperatures in northern China can drop as low as -40℃, with Mohe City in Heilongjiang Province once recording a record low of -52.2℃. Conversely, high-temperature regions can experience temperatures exceeding 45℃—Turpan is reputed to be the hottest location in China. Considering that RRUs are exposed to direct sunlight, lack active cooling systems, and generate additional heat during operation, the optical modules integrated into RRUs must be designed to withstand temperatures up to 85℃.
Figure 2: Physical Diagram of an RRU
Based on the above analysis, optical modules working in RRUs must support an industrial temperature range of -40℃ to 85℃ to ensure stable performance under extreme outdoor environmental conditions.
This clearly explains why optical modules for CPRI wireless network applications are required to support industrial temperature ranges.
Moduletek offers industrial-grade temperature optical modules designed for CPRI applications. Welcome to contact us for inquiries and purchases.
If you have any questions about the above content, please contact us via email: sales@moduletek.com
