国家重点实验室
Evolution of Network- RateDWDM SONET OC-48 T-4 carrier
1.0E+14 Transmission rate (bits/s) 1.0E+12
The improvement in transmissionbit rate over the last 150 years. In this time we have gone from telegraph systems that operated at
1.0E+101.0E+08 1.0E+06
T-1 carrier
1.0E+041.0E+02
Baudot multiplex Printing telegraph
tens of bits/s to modern optical systems that operate at terabits/s.
1.0E+00 1850 1875 1900 1925 1950 1975 2000
1837年Morse code,数字传输系统 1851, the first submarine cable was established between London and Paris./routing, switch 1874,Baudot system, multiplex,/1876, Bell,telephone
1901,Marconi, send and receive radio signals across the Atliantic,