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Fault-tolerant real-time multicast protocols are needed to develop fault-tolerant distributed real-time services such as group membership and redundancy management. In this paper, we propose the fault-tolerant real-time multicast protocol RFRM/X which is extended from RFRM. RFRM/X integrates clock synchronization module into the faulot manager by replacing heartbeat messages by clock synchronization messages. Thus, fault detection service is implemented without extra messages and with only a small overhead in the message size, quality of service is improved.