The angle between the axis of the main lobe of an antenna pattern and the horizontal plane at the transmitting antenna. Synonymtakeoff angle.

In security, a relationship between requirements such that one requirement must be satisfied before others can meet their own objectives.

1. Reducing or randomizing the polarization of an electromagnetic wave.
Note: Depolarization may be caused by transmission through a nonhomogeneous medium or a depolarizer.
2. Prevention of polarization in an electric cell or battery.

Synonym doubly clad fiber.

Synonym doubly clad fiber.

Abbreviation for double-ended queue.

A reduction in regulation of (a) tariffs, (b) market entry and exit, and/or (c) facilities in public telecommunication services.

A double-length key used to compute another key cryptographically.
Note: The derivation key is normally used (in receiving a transaction) to derive or decrypt the transaction keys used by a great number of originating terminals. [After X9.24]

In cryptography, a key-management technique that uses a unique key for each separate transaction to prevent the disclosure of any past key used by the transaction-originating tamper-resistant security mode (TRSM).
Note: The unique transaction keys are derived from a base derivation key using only non-secret data transmitted as part of each transaction. [After X9.24]

1. Data Encryption Standard,
2. Digital Encryption Standard