Non-Return to zero(nrz 0 0 00 85 0 -85 1->high signal; 0-> low signal Long sequences of 1's or os can cause problems Sensitive to clock skew, i.e. hard to recover clock Difficult to interpret o' s and 1s ecture 6 15-441e2008 7Non-Return to Zero (NRZ) •1 -> high signal; 0 -> low signal •Long sequences of 1’s or 0’s can cause problems: – Sensitive to clock skew, i.e. hard to recover clock – Difficult to interpret 0’s and 1’s V 0 .85 -.85 0 1 0 0 0 1 1 0 1 Lecture 6 15-441 © 2008 7