In this paper, we develop a framework for computing upper and lower bo
unds of an exponential form for a large class of single resource syste
ms with Markov additive inputs. Specifically, the bounds are on quanti
ties such as backlog, queue length, and response time. Explicit or com
putable expressions for our bounds are given in the context of queuing
theory and numerical comparisons with other bounds and exact results
are presented. The paper concludes with two applications to admission
control in multimedia systems.