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Tele-Communication (Telecom) Terms Glossary and Dictionary
Tandem Switching
Tandem Switching, also called class 4 switching, refers to the switching of long distance calls in PSTN. Tandem is a telephony term meaning "to connect in series." Thus, a tandem switch connects one trunk to another. A tandem switch is an intermediate switch or connection between an originating telephone call and the final destination of the call.
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