Implementation
This section contains the build instructions for the Ma Bell Gateway—the “how” of turning the design into a working device.
Where the Design section explores alternatives and documents decisions, this section provides the concrete details needed to actually construct the gateway: schematics, component values, firmware code, PCB layouts, and mechanical assembly.
Bill of Materials – Complete parts list with sources and specifications
Circuit Implementation – Detailed schematics for the SLIC interface, ring generator, power supply, and audio paths
Firmware – ESP32 code architecture, state machine implementation, and audio subsystem details
PCB Design – Board layouts, routing guidelines, and manufacturing notes
Enclosure – Mechanical design for housing and mounting
Each subsection builds on the decisions made in the Design section, providing step-by-step guidance for implementation.