| Abbreviation | Definition |
|---|---|
| CSR | Channel Status Register |
| CSS | Circuit-Switched Cellular |
| CST | Common Spanning Tree |
| CSTN | Computer Systems Technician Networking |
| CSTN | Corporate Switched Telecommunications Network |
| CSTR | Call Successfully Terminated Ratio |
| CSU/DSU | Channel Service Unit / Data Service Unit |
| CSV | Client SMTP (Simple Mail Transfer Protocol) Validation |
| CSV | Clustered Shared Volume |
| CTAC | CHECO Technical Advisory Committee |
| CTC | Client Transport Control |
| CTCL | Computer-To-Computer Link |
| CTCP | Client To Client Protocol |
| CTD | Common Terminal Driver |
| CTF | Communications Task Force |
| CTI | Computer Telephony Integration |
| CTIA | Computer Technology Industry Association |
| CTN | Coalition Theory Network |
| CTR | CUWIN (Community Wireless Network) Technical Report |
| CTS | Cluster Testing System |