Us robotics 3COM I-MODEM User Manual

3COM I-MODEM
RELEASE NOTES

New Features

The following new features have been added to your
modem:

■ V.90 Server Capabilities

■ Selective Reject

■ Disabling reset to view previous call data

■ Fast Answer

■ Turning off echo canceller (2100hztone)

■ Microsoft Encrypted Password Authentication

■ IDSL

Year 2000 Compliance

For information on Year 2000 compliance and 3Com
products, visit the 3Com Year 2000 web page:

http://www.3com.com/products/yr2000.html

New AT Commands

The following table includes a list of all AT commands
needed to use these new features. See the Command
Reference on the Connections CD-Rom for more
information regarding bit-mapped registers.

In order to Command

Enable V.90 (Default) ATS58.5=0
Disable V.90 ATS58.5=1
Disable 2100hz tone in DOV ATS69.6=1
Disable the asterick (*) key on the SLIC as a redial ATS68.5=1

Part No.1.024.1362-00
Published March1998

2 3COM I-MODEM RELEASE NOTES

In order to Command

Enable the asterick (*) key on the SLIC as a redial ATS68.5=0
Disable Selective Reject ATS51.6=1
Enable Data Over Voice ATS69.5=1
Enable Fast Answer ATS69.7=1
Ignore ATZ ATS69.2=1

V.90

The I-modem now has V.90 server capabilities. By default,
V.90 is enabled on your modem.

V.90 analog clients can call into your
connections. The analog device port is not able to act as a
V.90 server

Selective Reject

The I-modem now supports Selective Reject for analog
calls. Selective Reject improves performance on noisy lines
by reducing the amount of overhead incurred when the
protocol must resend data due to errors.

When Selective Reject is active, only the frame that
contained the error is resent, instead of the frame plus all
of the following unacknowledged frames.

I

-modem to get V.90

Selective Reject is an optional part of the ITU-T V.42 (LAPM)
standard. By default, Selective Reject is enabled.

Disabling reset to view previous call data

If the communication software you use with your I-modem
cannot be configured to stop sending the ATZ string before
or after each connection, set your
When the

I

-modem ignores ATZ, it does not clear out the

previous call statistics in the ATI6 screen.
By default, this feature is disabled.

I

-modem to ignore ATZ.