Traditional Culture Encyclopedia - Traditional culture - What types of transmission technologies and access technologies are used by China Mobile? Can any experts please help?

What types of transmission technologies and access technologies are used by China Mobile? Can any experts please help?

Mainstream transmission technologies for mobile metropolitan area networks: There are four main categories: the first category is a multi-service platform based on SDH; the second category is a solution based on layer 2 switching and layer 3 routing, mainly referring to RPR Ethernet

Solution; the third category is WDM solution for metropolitan area network, which is a multi-service platform based on WDM; the fourth category is a multi-service platform solution based on ATM.