The procedure by which characters entered into a system are not physically revealed [CESG].
Note: Often employed when passwords are entered so that they are not disclosed to casual observers.

A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction.

An echo check used in public switched networks operating in the full-duplex transmission mode, i.e., the two-way-simultaneous mode.

1. Electronic Countermeasures,
2. Entitlement Control Message.

Equal Cost Multipath Routing

Emergency Context Resolution with Internet Technologies

Event-Driven Architecture

Enhanced Data-Rate for GSM Evolution

In a video display, distortion that is concentrated at or near the edge of objects, and that is categorized further by its temporal and spatial characteristics.

An LED that has a physical structure superficially resembling that of an injection laser diode, operated below the lasing threshold and emitting incoherent light.
Note: Edge-emitting LEDs have a relatively small beam divergence, and thus are capable of launching more optical power into a given fiber than are the conventional surface-emitting LEDs. [After FAA]