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| 1. | a weak radio signal; a weak link. |
| 微弱的无线电信号；薄弱的连接。 |
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| 2. | Signal link performance monitoring - monitors link performance and removes links not meeting performance |
| 信令链路性能监视 -- 监视链路性能并删除不符合性能要求（64 个错误）的链路。 |
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| 3. | down link signal |
| 下行线路信号 |
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| 4. | Link Status Signal Units (LSSU) - transport link status information to an adjacent signaling point. |
| 链路状态信令单元 (LSSU) -- 将链路状态信息传输到某个相邻的信令点。 |
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