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Chapter 1 - Introduction and Description
Technical Specifications
Your MTA128ST-USB terminal adapter meets the following specifications:
Trade Name
MultiModemISDN
Model Number
MTA128ST-USB (International)
Network Interface
Four-wire S/T interface
Switch Compatibility
EuroISDN (ETSI/DSS1/NET3), VN4, INS64, U.S. NI-1, AT&T 5ESS,
DMS-100
B-Channel Protocols
V.110*, V.120, X.75, ML-PPP
Voice Coding
PCM: A-Law (Europe); µ-Law (US)
LED Indicators
10 front panel LED indicators: Transmit Data, Receive Data, Call Status,
B1 Active, B2 Active, Terminal Ready, Off Hook (AUX port), 128 Kbps,
P1 Active (data protocol), P2 Active (data protocol)
Data Connections
Two ISDN B-channels
One ISDN D-channel
One analog port for connecting a standard telephone, modem, or fax
machine
Command Interface
AT commands, S-registers, result codes,
Windows 2000/98/95 configuration utility, and
Windows 2000/98/95 Dial-Up Networking (DUN)
Connectors
USB: Type B connector
ISDN: RJ-45 female receptacle, 4-wire S/T (accepts connection cable
to the network provider’s NT1 device)
AUX: RJ-11 female receptacle
Switches
Two-position power switch
Power Requirements
Two-prong outlet-mounted transformer (included), 240 VAC
50/60 Hz
Dimensions
15.0 cm × 10.7 cm × 2.8 cm (L × W × D)
Environmental
Temperature range 0°–50° C;
Humidity range 20–90% (noncondensing)
Power Consumption
4 watts
Weight
224 g (8 oz)
Warranty
5 years
* The MTA128ST-USB is manufactured in two builds. To determine the build of your terminal adapter
(TA), issue the ATI2 command in a terminal window. If the TA responds to the command with MTA128ST-
USB, then it supports V.110. If your TA resonds to the ATI2 command with MTA128ST-USB-RC, V.110
support is not available.