Embedding is a method to obtain new distributed protocols for other topologies from existing protocols designed for specific topologies. But the fault tolerance of the original protocol is rarely preserved in the protocol embedded in the target topology, called embedded protocol. Specifically, transient faults can affect intermediate processes along the path in the target topology that corresponds to a link in the original topology. In this paper, we propose to analyze and model the communication of the embedded protocol as unreliable communication along the links of the original protocol. We propose a particular type of unreliable channel called almost reliable channel and we show an implementation of these channels for embedding a protocol into another topology.