After ruling out traditional problems like passive intermodulation (PIM), poorly aimed antennas and/or other coaxial problems, dirty fiber connectors account for 60 to 75% of the alarms, failures, and poor throughput problems found in modern cellular systems today. The customer has 2 alarms on BTS3900 (GSM-R network). BBU Optical Module Transmit/Receive Fault 2. RF Unit Maintenance Link Failure The results of this alarms was restarting of the RF unit. It has been several years since. There are multiple ways that optical modules fail in common ways that can interrupt network connectivity. This is typically due to one of the following failures: hardware defect, poor seating, or incompatibility. However, during installation and daily operation, various issues may arise. Therefore, understanding common optical module. The following table lists common abnormal phenomena and solutions during the installation of optical modules: Ⅱ.
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