Features – Multi-Tech Systems MTA128NT User Manual
Page 5
Introduction and Description
MTA128ST/NT
5
This manual documents the following models:
• MTA128ST for S/T interface with one POTS port
• MTA128NT 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 RJ-11 jack.
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. NI-1, AT&T 5ESS, and DMS-100 switch protocols
•
Compatibility with V.110 (some models only), V.120, ML-PPP, and X.75 protocols
•
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 (Point-to-Point Protocol) for high speed ISDN connections
•
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, S-registers, and result codes
•
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) U-Loop consists of 2 conductors from the CO (telephone company central
office) to the customer premises. The equipment on both sides of the U-loop has been designed to deal
with the long length of the U-loop and the noisy environment it operates in. At the customer premises the
U-loop is terminated by an NT1 (network termination 1) device. An NT1 is a device which provides an
interface between the two-wire twisted-pairs used by telephone companies in their ISDN BRI network and
an end-user's four wire terminal equipment. The NT1 drives an S/T-bus which is usually made up of 4
wires, but in some cases may be 6 or 8 wires.
The name of the S/T bus comes from the letters used in the ISDN specifications to refer to two reference
points,
S and T. Point T refers 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 customer-owned telephone exchange). When a PBX is present, point
S refers to the
connection between the PBX and the terminal. Note that in ISDN terminology, "
terminal" can mean any
sort of end-user ISDN devices, such as data terminals, telephones, FAX machines, etc. The diagram
which follows reflects interface points in a typical ISDN network.