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.
New AT Commands 3
Fast Answer
Fast Answer saves time by forcing the I-modem to answer
calls as fast as possible without going through the Ring
Indicate toggling sequence.
By default, Fast Answer is disabled on your modem.
Turning off the echo canceller (2100hz tone)
You can now configure the I-modem so it does not send a
2100hz tone at the beginning of a call.
When Data Over Voice (DOV) is enabled, the
sends a 2100hz tone at the beginning of a 3.1khz 56 kbps
voice call to turn off the telephone company’s echo
canceller.
If there are no echo cancellers on the B-channel during the
call, disable the 2100hz tone in DOV to save 2 seconds of
connect time.
When you disable the tone, you also risk not being able to
connect to the phone number.
By default, this feature is enabled; the
2100hz tone at the beginning of a DOV call.
Microsoft Encrypted Password
If the I-modem is connecting to a server that supports
Microsoft Encrypted Password Authentication, the
I
-modem will respond to the server using the same
protocol. However, the
your computer using Password Authentication Protocol
(PAP).
Since your computer must communicate using PAP, the
software on your computer should not be configured to
ONLY accept Microsoft Encrypted Password.
Your modem will translate PAP into Microsoft Encryption
Password Authentication to communicate with the server.
The password will be clear-text over the serial cable
between your computer and the modem. Once the
password is on the ISDN telephone network, the password
will be encrypted.
I
-modem
I
-modem sends a
I
-modem will communicate with
4 3COM I-MODEM RELEASE NOTES
IDSL
Your modem now supports 128Kbps synchronous mode.
When your modem is in this mode, it supports USWest
128K IDSL service.
IDSL mode is a leased line configuration, there is no call
setup required or supported. When the modem is turned
on and in IDSL Mode, it will attain physical layer
synchronization with the network. Data passes over both
B-Channels, to a single 128Kbps data stream. The data
stream is sent in a synchronous data format across the DTE
interface.
Once you have configured your modem for IDSL Mode, the
modem will read settings from NVRAM upon powerup.
To configure your modem for IDSL mode, enter the
following commands:
AT&F1*V2=4
ATS67=6S44=3M0&C1&D2&L1&M1&W
Your modem will respond with an "OK" message after you
enter each command.
New Connect Messages 5
New Connect Messages
The table below includes all new connect messages..
Message # Message #
28000 256 40000/ARQ/V90 287
28000/ARQ 257 33333/V90 288
28000/V90 258 33333/ARQ/V90 289
28000/ARQ/V90 259 37333/V90 290
29333 260 37333/ARQ/V90 291
29333/ARQ 261 41333/V90 292
29333/V90 262 41333/ARQ/V90 293
29333/ARQ/V90 263 42666/V90 294
30666 264 42666/ARQ/V90 295
30666/ARQ 265 44000/V90 296
30666/V90 266 44000/ARQ/V90 297
30666/ARQ/V90 267 45333/V90 298
32000 268 45333/ARQ/V90 299
32000/ARQ 269 46666/V90 300
32000/V90 270 46666/ARQ/V90 301
32000/ARQ/V90 271 48000/V90 302
34666 272 48000/ARQ/V90 303
34666/ARQ 273 49333/V90 304
34666/V90 274 49333/ARQ/V90 305
34666/ARQ/V90 275 50666/V90 306
36000 276 50666/ARQ/V90 307
36000/ARQ 277 52000/V90 308
36000/V90 278 52000/ARQ/V90 309
36000/ARQ/V90 279 53333/V90 310
38666 280 53333/ARQ/V90 311
38666/ARQ 281 54666/V90 312
38666/V90 282 54666/ARQ/V90 313
38666/ARQ/V90 283 56000/V90 314
40000 284 56000/ARQ/V90 315
40000/ARQ 285 57333/V90 316
40000/V90 286 57333/ARQ/V90 317
6 3COM I-MODEM RELEASE NOTES
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