The M452 creates a 110 Hz clock for the TTY transmitter and a 880 Hz clock
for the TTY receiver.
Does it? The prints I have show the 2 outputs with a factor of 4 (not 8) in
frequency.
The M405 for the DP12-B serial port generated a clock
that is 16x the baud
rate which is then divided by an M216 module.
So for 110 baud (which you say you have), the M405 is running at 1760Hz? I do
not believe that for one moment!
-tony