Abstract

The first installation of the No. 1 Electronic Switching System (No. 1 ESS), a stored-program electronic telephone switching system developed by Bell Telephone Laboratories, started commercial operation in Succasunna, New Jersey, on May 30, 1965. In the No. 1 ESS, call processing and maintenance functions are performend under the control of a program of some 100,000 words stored in a readonly type of memory. The 44-bit instructions are executed by a central processor operating on a basic cycle time of 5.5 microseconds. A read-write type of memory with 24-bit word locations is used for the storage of transient information such as the digits dialed by a subscriber.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.