L

[This is preliminary documentation and subject to change.]

local announcement

A specific message that is intended to be sent over a particular broadcaster's own transponder. Most local announcements are not human-readable. Local announcements are generally sent at frequent intervals a short time before the broadcast they announce. See also global announcement.

local area network

(LAN) A network dispersed over a relatively limited area and connected by a communications link that enables each device on the network to interact with any other. See also wide area network.

log on

To provide a user name and password that identifies you to a computer network.

luminance

A measure of the degree of brightness or illumination radiated by a given source. Alternatively, the perceived brightness component of a given color, as opposed to its chroma. See also YUV.