Multi-Tech Systems MTA128NT - Manual (Page 4)

Introduction and Description
MTA128ST/NT 4
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Welcome to the world of ISDN communications.
You have acquired one of the finest ISDN terminal adapters (TAs) available today, model MTA128ST/NT
from Multi-Tech Systems. The MTA128ST is a desktop TA with an S/T interface port to connect it to the
ISDN network and an analog port to connect it to a telephone, modem, or fax machine. The MTA128NT is
a desktop TA with a U-interface to connect it to the ISDN network and an analog port to connect it to a
telephone, modem, or fax machine. The TAs ship with a software configuration utility for Windows® 98/NT/
ME, and ConfigMenu, a built-in configuration utility for Windows and non-Windows operating systems. In
addition, the MTA128ST/NT accepts AT commands that enable it to use the same communications
software as an analog modem.
The MTA128ST is compatible with the popular EuroISDN switch protocol, it communicates using ISDN BRI
(2B+D) service, which provides up to 128 Kbps data and voice communications, and it automatically
detects whether an incoming call is voice or data and handles it appropriately.
The MTA128ST/NT provides dial-up asynchronous communication capability with other personal
computers, terminals, on-line computer services, or other computer systems. Connection to your
computer/terminal device is made via the RS232 connector (ISDN). Connection to analog devices is
accomplished with an RJ11 connector and one RJ45 connector is used for your ISDN connection.
This User Guide will help you install, configure, and operate your MTA128ST/NT.
Product Description
There are two ISDN interface options, S/T and U. If you purchased the S/T interface adapter
(MTA128ST), you need an ISDN NT1 device connection to the ISDN switch. If you purchased the U
interface adapter (MTA128NT), it can directly connect to the ISDN switch (figure 1-1).
ISDN
central office
customer site
NT1 ISDN U interface
T interface
ISDN
ISDN U interface
MTA128NT
MTA128ST
customer site
Figure 1-1. ”S/T” and “U” Interface Options
Your ISDN TA is compatible with prevalent ISDN switch protocols. It communicates using ISDN BRI
(2B+D) service, which provides up to 128K bps data communications.