1. The security that is inherent in the physical surroundings in which a facility or functional unit is located, such as on ships, on aircraft, and in underground vaults, where locations by their nature provide a certain amount of protection against exploitation of compromising emanation even before other protective measures are implemented.
2. The application of electrical, acoustic, physical, and… (Read More →)

Abbreviation for end office.

Abbreviation for end-of-transmission character.

Abbreviation for engineering orderwire.

Electronic Product Code

Enhanced Packet Data Interworking Function

Electronic Program Guide

A electronic or hard-copy table or listing of the predicted positions of astronomical bodies such as the planets or the Moon; and by extension, the predicted positions of artificial satellites, such as communications satellites, orbiting the Earth. Plural ephemerides.
Note 1: Ephemerides are essential tools for accurate aiming of movable high-gain antennas at, e.g., communications satellites, especially ones that exhibit… (Read More →)

A date in history, chosen as the reference date from which time is measured.
Note 1: An example of an epoch date is the beginning instant of January 1, 1900, Universal Time, for Transmission Control Protocol/Internet Protocol (TCP/IP).
Note 2: TCP/IP programs exchange date or time-of-day information with time expressed as the number of seconds past the epoch date.

Ethernet Passive Optical Network