G 657 - meaning and definition. What is G 657
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What (who) is G 657 - definition

YEAR
657 (year); Year 657; AD 657; 657 CE; 657 AD; Events in 657; Births in 657; Deaths in 657
  • [[Pope Vitalian]] (657–672)

G.657         
ITU-T RECOMMENDATION
Draft:G.657
G.657 is an international standard developed by the Standardization Sector of the International Telecommunication Union (ITU-T) that specifies single-mode optical fiber (SMF) cable.
657 BC         
The year 657 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 97 Ab urbe condita .
German submarine U-657         
GERMAN WORLD WAR II SUBMARINE
U-657
German submarine U-657 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.

Wikipedia

657

Year 657 (DCLVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 657 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.