其他 -一些缩略语 [7]
| SAP | 业务接入点 | Service Access Point |
| SAP | 服务公告协议 | Service Advertising Protocol |
| SAR | 分段和重组(子层) | Segmentation and Reassembly |
| SAS | Single Attached Station | |
| SC | Stick and Click connector | |
| SCR | 信号串扰比 | |
| SCR | 持续信元速率 | Sustained Cell Rate |
| SCS | 交换控制软件 | |
| SDH | 同步数字系列 | Synchronous Digital Hierarchy |
| SDLC | 同步数据链路控制(协议) | Advanced Data Communication Control Procedure |
| SDTV | 标准数字电视 | |
| SDU | 业务数据单元 | Service Data Unit |
| SIPP | 增强的简单因特网协议 | Simple Internet Protocol Plus |
| SLIP | 串行线路IP | Serial Line Interface Protocol |
| SMDS | 交换式多兆比特数据业务 | Switched Multimegabit Data Services |
| SMF | 单模光纤 | Single-mode Fiber |
| SMI | Structure of Management Information（MIB的结构） | |
| SMT | 站点管理 | Station Management |
| SMTP | 简单邮件传输协议 | Simple Mail Transfer Protocol |
| SNA | 系统网络体系结构 | System Network Architecture |
| SNMP | 简单网络管理协议 | Simple Network Management Protocol |
| SNR | 信噪比 | Signal-Noise ratio |
| SOH | 段开销 | |
| SONET | 同步光纤网络 | Synchronous Optical Network |
| SPE | 同步净荷包 | Synchronous Payload Envelope |
| SPP | 定序分组协议 （XNS中，相当于TCP） |
Sequential Packet Protocol |
| SRTS | 同步剩余时间标签法 | |
| SSCS | 业务特定部分会聚子层 | |
| SSI | 服务器端包含 | Server Side Include |
| ST | Stick and Turn connector | |
| STM | 同步传输方式 | Synchronous Transfer Mode |
| STP | 屏蔽双绞线 | Shielded Twisted Pair |
| STS | 同步传输信号 | Synchronous Transport Signal |
| SVC | 交换虚电路 | Switched Virtual Circuit |
| Switch | 交换机 |
| TAC | Technical Assistance Center | |
| TAST | 时间分配话音插空技术 | Time Assignment by Speech Interpolation |
| TC | 传输汇集(子层) | Transmission Convergence |
| TCP | 传输控制协议 | Transmission Control Protocol |
| TDM | 时分多路复用 | Time Division Multiplexing |
| TFTP | 单纯文件传输协议 | Trivial File Transfer protocol |
| TIP | 终端接口处理机 | Terminal Interface Processor |
| TP | 双绞线 | Twisted Pair |
| TSAP | 传输层服务访问点 | Transport Service Access Point |
| TTL | 生存时间 | Time To Live |
| TTR | 定时令牌旋转 |