Desired features for Port-O-Rotary v2:
-
Pulse decoder - Done!
-
Ringer driver - Needs work.
- On-hook detection - Done!
- Battery charger - Done! (Built into the FONA)
- Dial tone injection (350 and 440 Hz) - Done! (Built into the FONA)
- Dialup modem support - sort of. Connection quality is very bad.
Source code: github.com/osresearch/rotary
Circuit board in the ITT 500 series phone:
| E2 | A = bell gray/red | E1 | G = RJ45 yellow |
| F = dial blue | K | C = bell gray | L2 = RJ45 red, bell red, hook relay |
| GN = dial white, RJ45 white | B = RJ22 black | L1 = RJ45 green, hook relay gray/green, bell black | |
| RR = dial green | |||
| R = RJ22 red and white, dial white, relay | |||
The rotary dial has two switches: the white one is open at rest and closed when the dial is disturbed from the rest position, the blue/green is normally closed, but opens when the rotor crosses a number.
Last update:
November 8, 2020