Video Surveillance Glossary of Terms [E]

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• » EI (Electronic Iris) [top]
  Certain CCD security cameras utilize an electronic iris to electronically mimic a traditional auto iris.  One drawback of an EI is that excessive light damages it over the long term. 
  
• » EIA (Electronic Industries Association) [top]
  EIA is both an electronics trade organization that develops industry standards and a term associated with serial communications applicable to digital video recorders.
  
• » Electronic Shuttering [top]
  This term applies to video cameras that compensate for moderate indoor changes in light without use of auto iris lenses.
  
• » E-mail notification [top]
  This is a feature of certain motion detecting Network IP Cameras.  When activity is detected, they can email authorized users images or video.  Griffid is one example of camera management software that accomplishes this.
  
• » Embedded operating system [top]
  Cameras with this can also operate as computers.  With an OS like Linux installed, they can perform other tasks such as sending images to a web site via FTP, email notification, and being simultaneously accessible by multiple users.
  
• » EMI (Electro Magnetic Interference) [top]
  If improperly shielded, most electronic equipment causes EMI.  The FCC sets the standards for electronic equipment shielding.
  
• » Ethernet [top]
  Ethernet can send information either wirelessly (known as WiFi) or, more commonly, over wires.  It runs at 10mbps, and all terminals connect to a single common bus (sometimes called a highway).  It serves as the IEEE (Institute of Electrical and Electronics Engineers) 802.3 standard, which ensures that networks adhere to a particular set of technical standards.   A new type, known as Fast Ethernet, or 100Base-T, runs at 100Mbps, and the newest type, Gigabit Ethernet, runs at 1gigabit per second. 
  
• » Event recorder [top]
  This type of recorder is kept in pause mode, and only records if activated by an alarm.
  
• » Extruded aluminum [top]
  This type of aluminum is used to construct housings for CCTV (closed circuit television) applications and provides the added benefits of increased strength, durability and resistance to harsher environmental conditions as compared to plastics.

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