"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

EARTH GROUND. The connection to earth. The graphic show how to connect a circuit from board [PCB] ground to chassis ground. In many cases chassis ground will also connect to earth ground.

EIA INTERFACE. Any of a number of equipment interfaces compliant with voluntary industry standards developed by the Electronic Industries Association (EIA) to define interface parameters.

Encapsulation: In open systems, the technique used by layered protocols in which a lower layer protocol accepts a message from a higher layer protocol and places it in the data portion of a frame in the lower layer.

Encode: To convert data by the use of a code, frequently one consisting of binary numbers, in such a manner that reconversion to the original form is possible.

End-Of-Transmission character (EOT): A transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings.

Ethernet: A standard protocol (IEEE 802.3) for a 10- Mb/s baseband local area network (LAN) bus using carrier-sense multiple access with collision detection (CSMA/CD) as the access method, implemented at the Physical Layer in the ISO Open Systems Interconnection—Reference Model, establishing the physical characteristics of a CSMA/CD network. [Ethernet Interface Description]

Eye pattern: An oscilloscope display in which a pseudorandom digital data signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep.