A switching frame buffer is described in which data units within a sequence of time slots, of a frame, may be simultaneously input and output at ports of the switching frame buffer. In one implementation, a write port may receive data units within a single cycle of the switch. A number of memories may be provided, where first selected ones of the memories constitute memory groups and second selected ones of the memories constitute a memory subsets, each of the memory groups including a corresponding one of the memory subsets. The write port may supply each of a number of copies of the data units to a corresponding one of the memory subsets. Multiplexers may be associated with the groups of the memories and a read port may receive one of the copies of a number of the data units from different ones of the multiplexers.