| A | B |
|---|
| RG | Radio Grade |
| RIP | Routing Internet Protocol |
| RJ | Registered Jack |
| RSA | Rivest, Shamir, Adelman |
| RSH | Remote Shell |
| RTP | Real Time Protocol |
| SC | Standard Connector/Subscriber Connector |
| SCP | Secure Copy Protocol |
| SDSL | Symmetrical Digital Subscriber Line |
| SFTP | Secure File Transfer Protocol |
| SIP | Session Initiation Protocol |
| SLIP | Serial Line Internet Protocol |
| SMF | Single Mode Fiber |
| SMTP | Simple Mail Transfer Protocol |
| SNAT | Static Network Address Translation |
| SNMP | Simple Network Management Protocol |
| SOA | Start of Authority |
| SOHO | Small Office/Home Office |
| SONET | Synchronous Optical Network |
| SPS | Standby Power Supply |
