![](/images/new-backgrounds/1189394/1893949x1.webp)
Introduction and Description
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. This manual documents the following models:
•MTA1 28ST for S/T interface with one POTS port
•MTA1 28NT for U interface with one POTS port
Some analog devices, including telephone set, answering machine, and modem, can be connected to the POTS port via an
This User Guide will help you install, configure, and operate your terminal adapter.
Features
The MTA128ST/NT communicates over public ISDN telephone lines. Features include:
•Compatibility with EuroISDN (ETSI/DSS1/NET3), French VN4, and Japanese INS64 switch protocols
•Compatibility with U.S.
•Compatibility with V.120,
•Transparent synchronous communication capability (CLEAR)
•ISDN BRI (2B+D) and analog ports
•RS232E serial port
•Serial port speeds to 460.8 Kbps
•Support of PPP
•Tone detection to allow use of a standard telephone for ISDN line access (an ISDN telephone is not required)
•Automatic detection of incoming calls as voice or data
•Windows 98/NT/ME software utility and a firmware utility for easy ISDN line configuration
•AT commands,
•Ability to use the same communications software as analog modems
•Flash memory for easy firmware upgrades
ISDN BRI Line
Before running the ISDN adapter, you need to get an ISDN BRI (Basic Rate Interface) line from your local telephone company. Your ISDN service provider will provide information to you about the ISDN central switch type, pertinent subscriber information and SPID (Service Profile ID) number(s) if required.
SPID (Service Profile ID)
The Service Profile ID (SPID) is applicable in the U.S. only. SPIDs are a series of numbers that inform the central office switch which services and features to provide to an ISDN device. The generic SPID format comprises 14 digits. The first 10 digits are the main telephone number on the terminal. The last 4 digits are dependent on the number of terminals on the interface and the services they support.
NT1 Connection
An ISDN Basic Rate (BRI)
The name of the S/T bus comes from the letters used in the ISDN specifications to refer to two reference points, Sand T. Point Trefers to the connection between the NT1 device and customer supplied equipment. Terminals can connect directly to NT1 at point T, or there may be a PBX (private branch exchange, i.e. a
5