Fr{\'e}d{\'e}ric Klopp Band edge behaviour of the integrated density of states of random Jacobi matrices in dimension 1. (146K, uuencoded gzipped postscript) ABSTRACT. Let $H$ be a Jacobi matrix acting on $\ell^2(\Z)$ and $V_\omega$ a random potential of Anderson type. Let $H_\omega=H+V_\omega$. We give a general formula relating the decay of the integrated density of states of $H_\omega$ at the edges of the almost sure spectrum of $H_\omega$ to the decay of the integrated density of states of $H$ at the edges of spectrum of $H$.