Jaton Communicator V.90 - Manual (Page 43)

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from the wall, to the Phone jack on the back of the modem.
The phone line, coming from the wall, must connect to the
Line jack.
Problem: Modem does not respond to AT Commands
Solution: Make sure the COM port settings in the software match the
hardware configuration.
Make sure the board seated properly (pushed all the way into
the slot).