ESP32 Ma Bell Gateway
Contents:
Introduction
The Bell System Blueprint
Telephone Service Standards
Solution Design
ESP32 Microcontroller
Circuit Design
Power Supply Design
Voice and Tone Audio Design
Ringer Signaling
Off-Hook Detection
DTMF Signaling (Detection and Generation)
Pulse Dialing Detection
Firmware Design
Enclosure Design
Implementation
User Guide
ESP32 Ma Bell Gateway
Solution Design
Circuit Design
View page source
Circuit Design
This section details the circuit design for the Ma Bell Gateway.
Contents:
Power Supply Design
Voice and Tone Audio Design
Ringer Signaling
Off-Hook Detection
DTMF Signaling (Detection and Generation)
Pulse Dialing Detection