A public switched data network (PSDN) is an actual network itself, whereas leased or public data connections are only the connections between networks.

Name: A public switched data network (PSDN) is an actual network itself, whereas leased or public data connections are only the connections between networks.
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A PSDN is a network that is publicly available for data transmission, while leased or public data connections only refer to the physical connections between networks.

A Public Switched Data Network (PSDN) Is an Actual Network