According to Oracle Bone Inscriptions, in the Pan Geng era of Shang Dynasty, that is, around 1400 BC, Xu bian reported the military situation to the Emperor, using the word "Laigu". After textual research, "Laigu" is similar to today's reconnaissance signal soldiers.
There is also a record of "simplified books" in the ancient book "Waiting for Classics", which is an official emergency document engraved with animal bones and passed by signal soldiers. "Jian Shu" originated from12nd century BC1/century BC, and was also the predecessor of the post office.
Extended data
Modern communication mode
(1) by mail
On the basis of physical delivery, although fewer and fewer people write letters now, the simpler and truer, the simpler and truer. Letters are the simplest and purest way to transmit information, not to mention the overflow and leakage of information caused by too fast transmission.
(2) telephone
Telephone can be divided into fixed telephone, mobile telephone and network telephone, and its transmission mode is basically the same as that of network, but the difference from network mode is that telephone can not directly transmit words and pictures, and the difference from postal mode is that it can not transmit physical objects.
(3) Fax
Fax is the fastest-growing non-telephone telecommunication service in recent twenty years. Still images recorded on paper, such as words, charts, photos, etc. , scanned and converted into electrical signals, and transmitted to the destination through various channels. At the receiving end, through a series of inverse transformation processes, a communication method similar to sending the original is obtained, which is called fax.