Lucent Technologies 6.1 manual Modem Data Stations

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112		August 1998
5 Data Communications
	About Data and Video Communications	Page 5-7
	Modem Data Stations	5

A modem data station uses a modem as its DCE to send and receive data.

The modem converts digital signals from the DTE at the originating station into analog signals so the data can be transmitted over analog telephone lines/trunks. At the receiving station, the modem converts the analog signals back to digital signals so the DTE at that end can accept them. A modem may provide dialing and answering capabilities for a modem data station; if not, a telephone can be connected to dial out.

NOTE:

If an analog multiline telephone is connected to the modem data station, the telephone and data station can be used at the same time. A voice call can be made or received while a data call is in progress. A data call cannot be made or received while a voice call is in progress.

A modem data station can be used to make analog data calls either over the telephone company network or to a data station inside the system.

The interface for a modem data station is the tip/ring (T/R) interface provided by one of the following:

■A General-Purpose Adapter (GPA), connected to an analog multiline telephone

■A port on a T/R module (012 T/R, 016 T/R, or 008 OPT)

■A Multi-Function Module (MFM) adjunct on an MLX telephone

There are different types of modem data stations, depending on the data station capabilities:

■Modem voice and analog data (analog voice-and-data)

■Modem data only

■Modem data and MLX voice

Each of these use different equipment as described in this section.