Table Of Contents - US Robotics x2 Courier I-modem Manual

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