Abstract
The past decade has seen the worldwide introduction of electronic switching with stored program control. Initially the application of this new technology was in local exchanges but today electronic systems are being introduced into trunk systems as well. One of the latest applications is No. 4 E.S.S., a very large trunk switch. This system, in combination with local systems such as No. 1 E.S.S. and new signalling arrangements, offers major innovations in telecommunication service. The introduction of stored program electronic switching at the local level in the Bell System has led to literally hundreds of new services and features being made available and many more being developed or planned. With stored program control and new signalling arrangements in the connecting trunk systems, the door is opened to both extending the local services and introducing totally new services. These trends are discussed along with examples of possible services. Finally, the effects on development, manufacture, administration, and the customer are reviewed.
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