| Word | Description |
| E.I. (Electronic Iris) | Automatically varies a CCD camera's shutter to mimic Auto Iris control, allowing fixed or manual iris lenses to be used in a wider range of areas. |
| EIA (Electronic Industries Association) | A standards organisation in the US specialising in the electrical and functional characteristics of interface equipment. |
| Encoded | The result of transferring information in a coded form to a medium. |
| Ethernet | A local area network (LAN) developed by Xerox, Digital Equipment Corp. and Intel. Standardised as IEEE 802.3 and ISO 8802.3. Ethernet connects up to 1024 nodes at 10 Mbps over twistedpair, coax and fibre optic cable. When a station is ready to send, it transmits its data packets onto the network, which is common to all nodes. All stations "hear" the data. The station that matches the destination address in the packet responds while the others do nothing. Ethernet is a data-link protocol and functions at the Physical and Data-link Levels of the OSI model (Layers 1 and 2). |
| Ethernet Address | A unique 48-bit number maintained by the IEEE/ISO and assigned to each Ethernet network adaptor. |
| Event | Valid transactions reported by Access Control and Monitoring Systems. |
| Ext. Sync (external sync) | The ability of CCTV equipment, normally cameras, to accept one or more of the standard sync formats so as to align itself to the rest of the system. |
| EXview™ | The latest interline CCD sensor from SONY that has increased sensitivity across the visible spectrum and the near IR. |