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From GHN

Microwave horn antennas on the roof of a telephone switching center in Seattle - Image by Vladimir Menkov

Used to enable sharing of physical lines of communication.

Subcategories

• Electronic switching systems - or ESS, a telephone switching system that digitizes analog signals from subscriber loops and interconnects them by assigning digitized signals to appropriate time slots
• Frame relay - a standardized wide area network technology that specifies the links of the channels using a packet switching technology
• Multiprotocol label switching - or MPLS, a method in high-performance telecommunications networks that directs data from one node to the next based on short path labels instead of long network addresses
• Packet switching - a digital networking communications method that groups all transmitted data into blocks called packets