Symbol 3100 Series Quick Reference page 15

Acoustic
Some Series 3100 terminals are equipped with a built-in acoustic
modem which allows direct data transmission over a telephone
line.
If your terminal is equipped with an acoustic modem, connect
the modem as follows:
1. Turn the terminal off.
2. Release the hand strap on the back of the terminal.
3. Slide the mouthpiece of the telephone into position on the
muff. Place the hand strap over the telephone handset as
shown below and reattach the strap.
4. Turn the terminal back on.
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