Comparison of asynchronous multiplexing systems with hunting-free frames

Application of multiplied block codes (MBCs) for realizing new flexible and efficient asynchronous multiplexing with hunting-free frames is investigated. First, the principles of MBC are overviewed to show the capacities of filterless clock recovery. Then it is shown that modification of simple frame structure of MBC line code can be used for attaining hunting-free reframing for multiplexing systems. Two types of MBCs are developed to this end. While the one uses header blocks for hunting-free reframing, the other uses no headers. Finally, high-efficiency MBC formats for hunting-free reframing are investigated. It is shown that almost hundred percent efficiency can be attained by adopting new types of MBC formats.