（单词翻译:单击）
| 中文 | 英文 | 缩写 |
| 插箱 | plug-in box | |
| 插座/插口/套节 | socket | |
| 插座转接器/适配器 | socket adapter | |
| 查地址文件 | addrout file | |
| 查号台 | directory assistance position | |
| 查看日志 | view log | |
| 查询电路 | inquiry circuit | |
| 差别化业务编码点 | Differential Services Code Point | DSCP |
| 差错处理 | error handling | |
| 差错恢复 | error recovery | |
| 差错检测 | error detection | |
| 差错控制 | error control | |
| 差错率 | error rate | |
| 差错校验和纠正 | Error Check and Correct | ECC |
| 差错校正 | error correction | |
| 差分平衡对线输出电路 | differential balanced symmetry output circuit | |
| 差分四相移相键控 | Differential Quarter Phase-Shift Key | DQPSK |
| 差拍 | heterodyne beat | |
| 拆单边 | single side disconnection | |
| 拆线证实 | clear confirmation | |
| 拆线证实延迟 | CLear Confirmation Delay | CLCD |
| 柴油发电机 | diesel generator | |
| 掺铒光纤放大器 | Erbium Doped Fiber Amplifier | EDFA |
| 掺合剂/杂质 | admixture | |
| 产品系列 | product portfolio | |
| 长/市合一交换设备 | local/toll switching system/switch/exchange | |
| 长波段 | Long-wavelength Band | L-Band |
| 长距 | long haul/long distance | |
| 长期比特差错率 | long term bit error rate | |
| 长期频率稳定度 | long term frequency stability | |
| 长途半自动插入 | semiautomatic toll offering | |
| 长途半自动业务 | toll semiautomatic service | |
| 长途插入音 | toll offering tone | |
| 长途话单（功能） | toll ticket | |
| 长途区号 | area code | |
| 长途通信公司 | Interexchange Carrier | IC |
| 长途网 | toll network | |
| 长途无权用户类别 | toll unauthorized category | |
| 长途转接局 | toll transit exchange | |
| 长途字冠 | toll prefix | |
| 常规波段 | Conventional-wavelength Band | C-Band |
| 常规内存 | conventional memory | |
| 常规突发脉冲序列 | Normal Burst | NB |
| 常见问题解答 | Frequently Asked Questions | FAQ |
| 场图像 | field picture | |
| 场预测 | field prediction | |
| 场周期 | field period | |
| 超长距离（传输） | Ultra Long Haul | ULH |
| 超大规模集成 | Ultra Large Scale Integration | ULSI |
| 超大规模集成电路 | Very Large Scale Integrated Circuit | VLSIC |
| 超大中继局 | super-large trunk exchange | |
| 超低频 | Ultra Low Frequency | ULF |
