| 单词 | Class 5 |
| 释义 | Class 5 A local central office (CO), which is the lowest class switching office in the public switched telephone network (PSTN) hierarchy. A Class 5 office is the point at which subscriber local loops and network trunks terminate and interconnect. Synonymous with central office (CO), central office exchange (COE), and end office. See also CO, end office, and PSTN. |
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