| 缩写 | 全称 | 中文释义 |
|---|---|---|
| D3 | Digital channel bank, Third generation | 数字信道组，第三代 |
| IDT | Integrated Digital Terminal | 集成数字终端 |
| ELFEXT | Equal-Level Far-End Cross-Talk | 等电平远端串扰 |
| FEBE-F | Fast data | 快速数据 |
| NSA | Non-Service Affecting | 不影响服务 |
| CPP | Calling Party Pays | 呼叫方付费 |
| SBX | Small Business Exchange | 小企业交易所 |
| TT | Text Telephone | 文本电话 |
| TAPS | Telephone Application Processing System | 电话应用处理系统 |
| PRA | Primary Rate Access | 主要费率接入 |