Is circuit switching being used anywhere today? Or has everyone switched over to packet communication?

Question

Computer networks

Is circuit switching being used anywhere today? Or has everyone switched over to packet communication?

Answer 1

Classical circuit switching - ISDN technology and telephony. One timeslot is occupied for the duration of the conversation, regardless of whether they speak within it or not. It is used in inter-operator junctions, connections of old automatic telephone exchanges, modem connections. Further development - SDH and DWDM, we configure the service from point A to point B, the resource (time or frequency) always remains busy, regardless of the presence of traffic there, is used in operator networks for channels with a capacity of> 10GE (DWDM) or for E1 multiplexing in thick stream (SDH), there is also an Ethernet over SDH option. But these are preconfigured channels that do not depend on the end client; in fact, switching does not occur there. Set up and use as much as you want. From this point of view, radio channels can be considered (wifi on one frequency, cellular communications on another,

Answer 2

If I'm not mistaken, backbone operators use circuit switching, just right.
DWDM essentially has switched channels, which are internally separated by spectral characteristics.