In a recent paper we have shown how wave variables can be used to interconnect passive plants with passive controllers such that the system remains l2-stable in spite of time-varying delays and data dropouts. The present paper further enhances these results by providing a detailed model that captures time-varying delays, data dropouts and network capacity for wireless ring token networks. It also provides a new theorem showing how an asynchronous controller can be implemented, which maintains an l2-stable system.