1. Change the security class of an object to one which does not dominate the original [CESG].
2. To change a MAC label or Information Label to a value that does not dominate the current label. Downgrade includes changing a label to value that is incomparable with the current label [POSIX.6].

1. A data link from a satellite or other spacecraft to a terrestrial terminal.
2. A data link from an airborne platform to a ground-based terminal.

To transfer a copy of a file residing on a remote computer to a user's computer.

1. In communications, the direction of transmission flow from the source toward the sink.
2. With respect to the flow of data in a communications path: at a specified point, the direction toward which data are received later than at the specified point.

The interval during which a functional unit is inoperable.

Abbreviation for differential pulse-code modulation.

Digital Program Insertion

Abbreviation for differential phase-shift keying.

Devices Profile for Web Services

Abbreviation fordistributed-queue dual-bus.