AT&T MERLIN LEGEND Release 2.0 Data User's Manual page 17

About Data Communication Equipment
Analog Data-only Station. This endpoint includes a
terminal connected to the control unit via a
modem.
however, the data station and telephone would not be
independent of each other (for example, the telephone
and data terminal cannot be used simultaneously.
The modem may accommodate a telephone;
Data Stations
1-7