1. call-associated signaling,
2. centralized attendant services,
3. channel-associated signaling,
4. conditional access system.

1. A series of reply posts to a message on a bulletin board system.
2. An offset stack of (usually) active windows displayed on a computer screen.
3. A connected series of essentially identical electronic circuits (for example, as might be used in serial-parallel converters).

Acronym for computer-aided software engineering, computer-aided systems engineering. Software used for the automated development of systems software, i.e., computer code.
Note 1: CASE functions include analysis, design, and programming.
Note 2: CASE tools automate methods for designing, documenting, and producing structured computer code in the desired programming language.

1. In data equipment, the change from letters to other characters, or vice versa.
2. In typewriting or typesetting, the change from lower case letters to upper case letters, or vice versa.

Technology that makes use of computer assisted software engineering (CASE) to enhance the development of systems design and development.

An antenna in which the feed radiator is mounted at or near the surface of a concave main reflector and is aimed at a convex secondary reflector slightly inside the focus of the main reflector.
Note 1: Energy from the feed unit illuminates the secondary reflector, which reflects it back to the main reflector, which then forms the desired forward… (Read More →)

Conditional Access Table

Category (cable)

The rapid reduction of the ability of a system, subsystem, component, equipment, or software to perform its intended function.
Note: Catastrophic degradation usually results in total failure to perform any function.

A component of a security clearance and/or security class used for computing access rights and controlling information flow by restricting access to the information to a specific group of subjects.
Note: [a] when more than one category is combined within a security class, access rights are granted only when all categories are present in the security clearance. [b] Adding a… (Read More →)