| Abbreviation | Definition |
|---|---|
| EPABX | Electronic Private Automatic Branch Exchange |
| EPPR | Empty Packet Production Rate |
| EPSCS | Enhanced Private Switch Controlled System |
| ERA | Enhanced Remote Access |
| ERC | European Radiocommunications Committee |
| ERI | Enhanced Roaming Indicator |
| ERL | Echo Return Loss |
| ERM | Explicit Rate Marketing |
| ESA | Enhanced Subscriber Authentication |
| ESFDL | Extended Super Frame Data-Link |
| ESG | Enhanced Service Gateway |
| ESG | Error Satellite Gauge |
| ESL | Educational Sales Ledger |
| ESMT | Ecole Superieure Multinationale Des Telecommunications |
| ESP | Electro-Selective Pattern |
| ESSID | Extended Service Set Identification |
| ESTA | Emergency Services Telecommunications Authority |
| ESVN | Executive Secure Voice Network |
| ET | Electronic Transmission |
| ET | Exchange Termination |