THE AUTOMATED MDF WITH THE BLOCKING METHOD - DEVELOPMENT OF THE AUTOMATED MAIN DISTRIBUTION FRAME-4000 TYPE

NTT have developed a remote controlled MDF called the Automated Main D istribution Frame 4000 Type (A-MDF4000), which can hold about 14,000 s ubscriber-cable side terminals (input terminals) and about 12,000 offi ce-equipment side terminals (output terminals). By developing of the A -MDF4000, we produced a system that could hold twice as many output te rminals as the former A-MDF. We used the blocking method for the A-MDF 4000, and as a result this system can hold about 4,000 output terminal s, where as the former system could hold 2,000 output terminals. Furth ermore, a system controller of the A-MDF4000 can multi-control three s ets of systems, and so the A-MDF4000 can be extended to hold about 12, 000 output terminals. This paper describes the outline of A-MDF4000, i fs hardware characteristics, and the algorithm for the reduction of bl ocking.