  In this paper we study a system of entangled chains that bear reversible
cross-links in a melt state. The cross-links are tethered uniformly on the
backbone of each chain. A slip-link type model for the system is presented and
solved for the relaxation modulus. The effects of entanglements and reversible
cross-linkers are modelled as discrete form of constraints that influence the
motion of the primitive path. In contrast to a non-associating entangled system
the model calculations demonstrate that the elastic modulus has a much higher
first plateau and a delayed terminal relaxation. These effects are attributed
to the evolution of the entangled chains as influenced by tethered reversible
linkers. The model is solved for the case when linker survival time $\tau_s$ is
greater than the entanglement time $\tau_e$ but less than the Rouse time
$\tau_R$.
