With 32 nodes this is only 230.4 Microsecond delay. For 100msec latency budget, with 50msec consumed by the circumfrence of earth, we still got 50ms of switching latency. What is a big deal in saving few micro seconds in RPR rings. Real latency we should consider is the queueing latency in rest of the network for voice applications.
Class based queueing with voice class scheduled first is the solution.
Cut-through means the packet on the ring keeps moving unless the insertion buffer filling increases because the node clocks a packet out of the transmit buffer. Moving means here, one internal word unit is written into the insertion buffer and at the same time one word unit is read out. Upon the arrival of empty words, the filling of the insertion buffer deceases until zero. In front of the insertion buffer stage, a pipe-lined header recognition stage also permits the packet to move through. Thus, all header information is available at the end of the header-recognition pipeline.