ocr: UNIPOLAR AND POLAR SIGNALING J 1 0 1 1 0 0 - - : 11 : A. Unlpolar nonreturn to zero B. Unipolar retum to zero 02014.101 0. - : 101 1 : J - 1 0 C.P Polar nonreturn to zero D. Polar retum to zero: Figure 1, Wirs unipolar signaling the mark signal, usuaily representing a 1, J5 indicated by a positive voltage or current, while. zere voltage or currenit represenis a. space or 0, Polar signaling represents warks (or is) with a positive voitage or erreN while spaces (or Os) are represented by a negative value. Returni to zero signaling requires that cuch mark signai start and jinish at: zerg within t ...
