Since telecommunication terms originated rather independently in different countries, technical literature in English still uses different terms for the same concepts, depending on whether the authors are from the United States, from the United Kingdom, or from other English-speaking countries, or documents are translations from other languages. Some frequently used synonyms are listed below:
Subscriber, customer, user Subscriber line, line, loop
Local exchange, local office, central office, end office Intermediate exchange, tandem exchange, toll exchange, transit exchange International switching center, gateway, international exchange Trunk, junction, circuit
Telecom, administration, carrier, operating company, telephone company, telco, service provider Exchange, switch Switchblock, switch fabric
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