Table of Contents
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Using DIP Switches to Configure Your I-modem...................................................12-4
Jumpers on the Internal I-modem .............................................................................12-4
Locating Jumpers .................................................................................................12-4
Changing Jumper Settings ....................................................................................12-5
Setting Jumpers for a Specific COM Port .............................................................12-6
Setting Jumpers for a Specific IRQ .......................................................................12-6
Chapter 13 Viewing LEDs......................................................................................13-1
Chapter 14 Using x2 ...............................................................................................14-1
Enhanced x2 Features..............................................................................................14-1
How to Tell if x2 is Enabled in Your I-modem ........................................................14-2
Obtaining x2 ...........................................................................................................14-2
How x2 Works.........................................................................................................14-3
Controlling x2 .........................................................................................................14-3
x2 Server Mode ...................................................................................................14-3
x2 Symmetric Mode (Host Mode) .........................................................................14-3
Controlling Link Speeds ......................................................................................14-4
Limiting the Highest Possible Connect Speed ......................................................14-4
Limiting the Lowest Possible Connect Speed........................................................14-5
Limiting a Range of Possible Connect Speeds......................................................14-5
&N and &U Command Values .............................................................................14-6
Troubleshooting x2 Client Connections ...................................................................14-7
New x2 Result Codes...............................................................................................14-8
Appendix A Other I-modem Features..................................................................... A-1
Data Over Voice....................................................................................................... A-1
Protocols Supported by Data Over Voice.............................................................. A-1
Configuring Data Over Voice ............................................................................... A-1
Period Dial Modifier................................................................................................. A-2
PCSDL vs. XMODEM ............................................................................................. A-2
230 kbps DTE Rate Under Windows®...................................................................... A-2
Saving Money With Analog Calls............................................................................. A-3
Appendix B Technical Information......................................................................... B-1
Technical Specifications ........................................................................................... B-1
Standards Compatibility ....................................................................................... B-1
ISDN .................................................................................................................... B-1
Modulation........................................................................................................... B-2
Error Control, Data Compression, Testing, and Dialing....................................... B-3
Fax....................................................................................................................... B-3
Additional Specifications...................................................................................... B-4
Ringer Equivalence .............................................................................................. B-5
Power Consumption ................................................................................................. B-5
Serial Ports............................................................................................................... B-5
The EIA-232 Interface.............................................................................................. B-6
Wiring a DB-25 to DB-9 Cable............................................................................. B-7
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