Contents
Contacting U.S. Robotics................................................................................. 1
Enhanced x2 Features...................................................................................... 2
Other New I-modem Features.......................................................................... 2
How to Tell if x2 is Enabled in Your I-modem................................................ 3
How x2 Works................................................................................................. 4
The Shift from Analog to Digital Circuits.................................................... 4
Client and Server Modems........................................................................... 4
Making x2 Work.......................................................................................... 5
Controlling x2................................................................................................. 6
x2 Server Mode........................................................................................... 6
x2 Symmetric Mode (Host Mode)................................................................. 6
Controlling Link Speeds with &N and &U...................................................... 7
Limiting Link Speeds................................................................................... 7
Limiting the Highest Possible Connect Speed.............................................. 7
Limiting the Lowest Possible Connect Speed............................................... 8
Setting a Range of Possible Connect Speeds................................................ 8
&N and &U Command Values..................................................................... 9
Data Over Voice............................................................................................ 10
Protocols Supported by Data Over Voice
................................................... 10
Configuring Data Over Voice.................................................................... 10
Host Mode Multilink PPP.............................................................................. 11
Determining TurboPPP Settings................................................................ 11
Setting Multilink PPP Host and Originate Mode....................................... 11
Making Calls With Multilink PPP.............................................................. 12
Dynamic Data Bandwidth Allocation............................................................ 14
Controlling Dynamic Bandwidth Allocation in MLPPP
............................. 14
Controlling Bandwidth Sample Time......................................................... 14
Setting When the I-modem Brings Up the Second Link
............................... 15
Setting When the I-modem Brings Down the Second Link
.......................... 15
Enabling the Tone When the I-modem Brings up the Second Link
.............. 15
Using Compression in TurboPPP mode..................................................... 16
Period Dial Modifier...................................................................................... 17
PCSDL vs. XMODEM.................................................................................. 17
230 kbps DTE Rate Under Windows®.......................................................... 17
230 kbps in Internal I-modems................................................................... 17
230 kbps in External I-modems.................................................................. 17
Saving Money With Analog Calls................................................................. 18
Digital and Analog Billing Structures........................................................ 18
Forcing Analog Calls................................................................................ 18
Troubleshooting x2........................................................................................ 19
New x2 Result Codes..................................................................................... 20
FCC Information........................................................................................... 23
