Mockingbird-Dual-Lane-Card

A dual subscriber line card for the Mockingbird Telephone Exchange

An interface card design for the Mockingbird Telephone Exchange.

Features:

• Provides two subscriber line interfaces.
• STM32F103C8T6 microcontroller.
• Accessed from the Main Microcontroller over I2C
• ATTEN signal to main microcontroller to tell it when there is an event to service.
• Audio bandpass filter for the received audio.
• Uses one R-TONE KS0835 SLIC module for each telephone line interface.
• Analog RX audio output, and TX audio input.
• Designed n KiCAD 8.0.

The main project website is on hackaday.io here: https://hackaday.io/project/196044-mockingbird-telephone-exchange