AT&T MERLIN LEGEND Release 2.0 Data User's Manual page 19

About Data Communication Equipment
Digital Data Stations
At a digital data station, you connect a data module to a DTE
to place and answer data calls at that station. A data module
transmits digital data to other digital data stations, including a
local host computer or local area network (LAN) workstation.
The communications system uses the 75006 Data Module to
connect to digital DTE. It connects on the system end
through an MLX port. It may share the MLX port with an MLX
telephone; however, the two units operate independently of
each other. The data module may also provide dialing and
answering capabilities to the data station.
The 7500B Data Module handles the data call over digital
telephone company facilities such as Primary Rate Interface
(PRI) or with another data station inside the system.
Data Stations 1-9