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Modem-HOWTO
Modem-HOWTO
David S.Lawyer
Contains much info from Serial-HOWTO by Greg Hankins
v0.03, May 1999
Help with selecting, connecting, configuring, trouble-shooting, and understanding modems for a PC. See Serial-HOWTO for multiport serial boards.
1.
Introduction
1.1 Copyright, Trademarks, Disclaimer, & Credits
1.2 Future Plans, You Can Help
1.3 New Versions of this HOWTO
1.4 What is a Modem ?
1.5 Quick Install
2.
Modem & Serial Port Basics
2.1 Modem Converts Digital to Analog (and conversely)
2.2 What is a Serial Port ?
2.3 IO Address & IRQ
2.4 Interrupts
2.5 Data Compression (by the Modem)
2.6 Error Correction
2.7 Data Flow (Speeds)
2.8 Flow Control
2.9 Data Flow Path; Buffers
2.10 Complex Flow Control Example
2.11 Modem Commands
3.
Configuring Modems (including the serial port)
3.1 Configuring Overview
3.2 Configuring the IRQ and IO-Address of the Serial Port
3.3 What is the current IO address and IRQ of my Serial Port ?
3.4 Other Configuring
3.5 Modem Configuration (excluding serial port)
4.
Modems for a Linux PC
4.1 External vs. Internal
4.2 External Modems
4.3 Internal Modems
4.4 Internal Modems You Must Avoid (winmodems, etc.)
4.5 Which Internal Modems are Best to Avoid ?
5.
Serial Port Devices
/dev/ttySN
5.1 Serial Port Device Names & Numbers
5.2 Creating Devices In the /dev directory
5.3 Link ttySN to /dev/modem ?
5.4 The cua Device
6.
Interesting Programs You Should Know About
6.1 What is getty?
6.2 What is Setserial ?
6.3 What is isapnp ?
6.4 What is wvdialconf ?
6.5 What is stty ?
7.
Trying Out Your Modem (Dialing Out)
7.1 Are You Ready to Dial Out ?
7.2 Dialing Out with Minicom
7.3 Dialing Out with Kermit
8.
Uugetty for Dial-In (from the old Serial-HOWTO)
8.1 Installing getty_ps
8.2 Setting up uugetty
8.3 Customizing uugetty
9.
What Speed Should I Use with My Modem?
9.1 Speed and Data Compression
9.2 Where do I Set Speed ?
9.3 Can't Set a High Enough Speed
9.4 Speed Table
10.
Communications Programs And Utilities
10.1 Minicom vs. Kermit
10.2 Lists of Programs
10.3
SLiRP
and
term
11.
What Are UARTs? How Do They Affect Performance?
12.
Troubleshooting
12.1 Software
12.2 My Modem is Physically There but Can't be Found
12.3 "Operation not supported by device" (error message) for ttySx
12.4 Slow. Text appears on the screen slowly after long delays
12.5 Uploading (downloading) files is broken/slow
12.6 For Dial-in I Keep Getting "line NNN of inittab invalid"
12.7 When I Try To Dial Out, It Says "/dev/ttySN: Device or resource busy"
12.8 I Keep Getting "Getty respawning too fast: disabled for 5 minutes"
12.9 My Modem is Hosed after Someone Hangs Up, or uugetty doesn't respawn
12.10 uugetty Still Doesn't Work
13.
Flash Upgrades
14.
Problems Explained
14.1 Interrupt Mis-set
14.2 Interrupt Conflicts
15.
Other Sources of Information
15.1 Misc
15.2 Books
15.3 HOWTOs
15.4 Usenet newsgroups
15.5 Web Sites
16.
Appendix A: How Modems Work (technical) (unfinished)
16.1 Modulation Details
17.
Appendix B: "baud" vs. "bps"
17.1 A simple example
17.2 Real examples
18.
Appendix C: Terminal Server Connection
19.
Appendix D: Other Types of Modems
19.1 Digital-to-Digital "Modems"
19.2 ISDN "Modems"
19.3 Digital Subscriber Line (DSL)
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