When using the system, the optical modules of standard wavelengths (commonly used 1550nm or 1310nm) of BBU/DU or RRU/AAU (commonly known as gray light module or white light module) need to be replaced with color optical modules of the same rate. The system can handle incredibly low latency times below 100 microseconds and offers pretty impressive bandwidth capabilities reaching around 24. For example, a macro station has 3 RRUs in a certain band of S111 stations and 6 transceiver ports from BBU to RRU, a 6-way OTM (optical terminal multiplexer) on each side of BBU and RRU can combine the transceiver signals between BBU and RRU into a single fiber, as shown in Figure 1. The Remote Radio Head (RRH) architecture consists of a baseband unit (BBU) and a remote radio unit (RRU). Both the BBU and RRU are connected using fiber optic cables to transport digital data and control information. High-speed link between baseband unit (BBU) and radio unit (RRU)-CPRI interface One of the competitive pressures faced by wireless operators is how to reduce the rising cost of base stations; to provide users with greater bandwidth and better quality of service. Location and Installation: RRUs are typically installed near the antenna, often on the tower.
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