NHK Tokyo recently renewed its core facilities to a total digital system for both program production and transmission. For transmitting digital video signals, we newly made use of "Parallel processing 10B1C" serial coding format. The advantages of this format are (i) stable transmission (ii) fast synchronization (iii) easy signal monitoring. For transmitting digital audio signals. AES/EBU audio coding format is used. The digitization of broadcasting facilities brings on high reliability, streamlined operation and labor savings.