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Electronics news

The Mockingbird telephone exchange

Landline telephones are fast disappearing. However, enthusiasts like Steve Rogers continue to be interested in old technology.

He decided to build his own landline telephone exchange, "The Mockingbird," which emulates the old Western Electric Number Five Crossbar Switching System.

The system supports 8 subscriber lines and 3 trunk lines and features a dedicated station and DTMF decoder board. Rodgers designed a set of custom boards and used STM32F103C8T6 microcontrollers and the STM32F767ZI Nucleo development board to control the communications.

Rodgers has published the source code for her development on GitHub and promises to provide more information about the custom boards developed for this project. She invites anyone who is interested in landline phones and would like to try their hand at development or teaching to read the project description.

Demonstration of the Mockingbird telephone exchange project: https://www.youtube.com/watch?v=1S4Ybc_A4XE.