From bcb704366cb5e333a626c18c308c7e0448a8e69f Mon Sep 17 00:00:00 2001 From: toma Date: Wed, 25 Nov 2009 17:56:58 +0000 Subject: Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features. BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdenetwork@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da --- doc/kppp/tricks.docbook | 175 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 doc/kppp/tricks.docbook (limited to 'doc/kppp/tricks.docbook') diff --git a/doc/kppp/tricks.docbook b/doc/kppp/tricks.docbook new file mode 100644 index 00000000..c2abc3bf --- /dev/null +++ b/doc/kppp/tricks.docbook @@ -0,0 +1,175 @@ + +Modem Tricks and Hints + +This section should get the fearful started on the (not so) arcane art of +modem tweaking. The commands here are all Hayes AT standard, but all modems are +not equal, so your mileage may vary. + + +Modem Sessions + +A Modem session allows you to interact with the modem directly. You type +commands, and it will respond. To obtain a modem session, when no connection is +active, go into Setup, then Modem +Terminal dialog. This will open a window for interactive +configuration of the modem. Try typing +ATZ (which resets your modem) Your +should get an OK response. Use +FileClose +to end the session. + + + + +Modem Profiles + +One reason you might want to send the modem commands directly is if you +have a set of modem configurations you want to keep, and not have to specify for +every connection. A good way to do that is via modem profiles. Modems can have +several stored profiles numbered 0,1,... AT&V can be used to +view them all. The default profile is usually 0 (this can be changed via +AT&Y.) The profile currently in use is called the +active profile. + +When you change a setting, the active profile is modified. The +ATZ command will have the modem load the default profile, +erasing any changes you have made. To save changes, Load the profile you want to +change via ATZn (where +n is the profile number). Make the changes you want, +then save it with AT&Wn. To +have kppp use the profile you want, change the modem initialization string +(Setup Modem Modem +Commands Initialization String.) For example +ATZ1 will have the kppp reset the modem and use stored +profile #1. + +If you want reset you modem to get back to some known starting point, use +AT&F&W to set the active profile to the factory +defaults, and store those settings as the default profile. + +Examples of profile changes are in the next section + + + + +Getting the modem to hang up + +Sometimes you may find that &kppp; has difficulties hanging up the modem. +This is likely the result of a mismatch between &kppp; settings and those of the +modem. A standard modem uses two methods to decide to hangup: Command, and DTR. The Command method involves +sending an escape sequence to the modem, which puts it in command mode, then +issuing the hangup command (ATH). + +Outside of &kppp;, when configuring the pppd +package manually, it's often helpful to use the command method, so that one can +exit a terminal session, and then start pppd without +having the modem hangup. In most other situations, the DTR +method is preferred, as it is simpler. + + +<acronym>DTR</acronym> (<command>AT&Dn</command>) method + +The DTR method will have the modem hangup whenever +&kppp; stops using the modem. If you obtain a modem session, and query the +state via AT&V, and you can see among the displayed +settings for the active profile a &D0, then the +DTR hangup method is disabled. To enable the +DTR method, use the Terminal button to +get a modem session, then: + + +ATZ # reset to default profile +AT&D2 # Set to hang up on DTR drop +AT&W # Write to default profile + + + +How the <acronym>DTR</acronym> method works + +Whenever the Data Terminal Ready (DTR) line on the +serial line between the host computer and the modem goes high, the modem hangs +up. When &kppp; opens the serial port, the DTR line is pulled +low, on an external modem, you can see the DTR (or +TR) light come on when this happens. When the +TR light goes out (because &kppp; has closed the serial port, +or something worse!), the modem will hangup. + + + + + +Command method + +The other way to have a modem hang up when connected (used when +AT&Dn where +n is not 2) is to have the +modem accept the command when a session is in progress. To have it hang up +properly, get a modem session, and set the guard time to a short interval like +so: + + +ATZ +ATS12=5 +AT&W + + +Then use the Guard Time slider in the Modem commands +section to match the register (S12 to this value +5. The modem should then hangup properly. + + +How the Command Method Works + +When the local modem is connected to a remote modem, it is in the +connect state, where it passes all characters it receives to the +remote modem without interpretation. To have the modem accept the characters +as commands for itself, one must put the modem into the command state. The +escape code does this. + +The escape code is defined as being three intervals of time whose length +is defined by S12 in fiftieths of a second. + + + +Quiet (must last more than S12/50 seconds) + + +Escape character (defined by the register S2, the +default is +), repeated three times (less than +S12/50 seconds between each. + + +Quiet (must last more than S12/50 seconds) + + + +Once the modem is in the command state, you can send it commands. To have +it hang up, send the command ATH. The escape codes and the +hangup string used by &kppp; are shown in the Modem Commands dialog. +These should match your modem. + + + + + + +Make Tone dialing faster + +If you can use tone dialing, the amount of time it takes to dial can be +changed using the S11 register. It gives the duration (in +100hundreds of a second) to send each tone while dialing. The default is +usually 95 (almost a second.) How fast you can dial depends on the phone +company's switching equipment which handles your line. The minimum duration is +50, almost twice as fast, and that speed often works. + + +ATZ # reset to default profile +ATS11=50 # fastest possible dialing, use a higher number if it doesn't work +AT&W # write to default profile + + + + -- cgit v1.2.1