Wall sign means either a sign applied with paint or similar substance on the surface of a wall or a sign attached essentially parallel to and extending not more than 24 inches from the wall of a building with no copy on the sides or edges.
Digital Signal Level 1 (DS-1) means the 1.544 Mbps first level signal in the time division multiplex hierarchy.
Digital Signal Level 1 or "DS1" means the 1.544 Mbps first-level signal in the time-division multiplex hierarchy. In the time-division multiplexing hierarchy of the telephone network, DS1 is the initial level of multiplexing.
Digital Signal Level means one of several transmission rates in the time division multiplex hierarchy.
Digital Signal Level 0 or "DS0" means the 64 Kbps zero-level signal in the time-division multiplex hierarchy.