| 字词 | protection channel |
| 释义 | protection channel 保护通［信］道 The broadband channel of a carrier system that is utilized as a spare and can be switched into service in the event of a failure of a normal working broad band channel. 载波系统中用来作备分的宽带信道,当一个正常工作的宽带信道出现故障时, 它可以被转接并投入工作。 |
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