Opinions about the Digital Data Network(DDN)
Jiajun Liu · Modern Electronic Technique · 2004
This article deals with the definition, structure and formation of DDN and describes the superior characteristics and functional abilities of DDN to those of simulate digital net. Applications and functions are being played in banks, railways, civil aviation, hospitals, etc., and the scope of services has been enlarged so as to keep pace with the development of the time. A good job has been done in the construction and management of the net so that the superiority of the net can be dug out to the best advantage.