AT&T Merlin II Feature Module 2 Data Communications Manual page 72

Disconnecting a Data Call
You can disconnect a data call by using the Break or the Escape key on your
keyboard. Which key you use depends on how the disconnect sequence
switch (switch 5 on the bottom of-the data stand) is set. See Figure 5-1.
Follow this procedure to disconnect a data call:
Perform the appropriate step, depending on how your data stand DIP
1
switches are set:
If switch 5 is set to the right (the on position), press the Escape key
–
twice within a 2-second period. Pause slightly between presses.
– If switch 5 is set to the left (the off position), press the Break key three
times within a 4-second period. Pause slightly between presses.
The message DISCONNECTED appears.
If the call doesn't disconnect, repeat step 1.
2
You may also be able to disconnect a data call by:
Pressing the Disconnect button if your computer or data terminal has one.
Using a long continuous break (more than 3 seconds).
Turning off your computer or data terminal.
Pressing the Self-Test button on the back of the data stand.
Turning off DTR from your computer or data terminal.
Data Calls with Digital Voice and Data Equipment 5-5