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fix minor typos in Modem-HOWTO.sgml
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@ -177,7 +177,7 @@ not in the trademark sense. All other trademarks belong to their
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respective owners.
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respective owners.
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<sect2> Credits
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<sect2> Credits
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<p> The following is only a rough approximation of how this this
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<p> The following is only a rough approximation of how this
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document was created in the year 2000: About 1/4 of the material here
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document was created in the year 2000: About 1/4 of the material here
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was lifted directly from Serial-HOWTO v. 1.11 (1997) by Greg Hankins.
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was lifted directly from Serial-HOWTO v. 1.11 (1997) by Greg Hankins.
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<url url="mailto:gregh@twoguys.org"> (with his permission). About
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<url url="mailto:gregh@twoguys.org"> (with his permission). About
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@ -461,7 +461,7 @@ external USB. The internal one is installed inside of your PC (you
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must remove screws, etc. to install it). An external one just plugs
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must remove screws, etc. to install it). An external one just plugs
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in to a cable: USB cable (USB modem) or to the serial port (RS-232
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in to a cable: USB cable (USB modem) or to the serial port (RS-232
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serial modem). As compared to external serial modems, the internal
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serial modem). As compared to external serial modems, the internal
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modems are less expensive, are less likely to to suffer data loss due
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modems are less expensive, are less likely to suffer data loss due
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to buffer overrun, and usually use less electricity. An internal
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to buffer overrun, and usually use less electricity. An internal
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modem obviously doesn't use up any desk space.
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modem obviously doesn't use up any desk space.
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@ -1150,7 +1150,7 @@ Pinout and Signals for more details.
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<sect2> Internal Modem Contains Serial Port
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<sect2> Internal Modem Contains Serial Port
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<p> For an internal modem there is no 9-pin connector but the behavior
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<p> For an internal modem there is no 9-pin connector but the behavior
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is almost exactly as if the above mentioned cable wires existed.
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is almost exactly as if the above mentioned cable wires existed.
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Instead of a a 12 volt signal in a wire giving the state of a modem
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Instead of a 12 volt signal in a wire giving the state of a modem
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control line, the internal modem may just use a status bit in its own
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control line, the internal modem may just use a status bit in its own
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memory (a register) to determine the state of this non-existent
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memory (a register) to determine the state of this non-existent
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"wire". The internal modem's serial port looks just like a real
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"wire". The internal modem's serial port looks just like a real
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@ -2476,7 +2476,7 @@ stty in the Serial-HOWTO or Text-Terminal-HOWTO..
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modem, you first need to make sure it can be found and that
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modem, you first need to make sure it can be found and that
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AT-commands and the like can be sent to it. So I suggest you first
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AT-commands and the like can be sent to it. So I suggest you first
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give it a very simple configuration using the communication program
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give it a very simple configuration using the communication program
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you will be using on the port and see it it works. If this works you
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you will be using on the port and see if it works. If this works you
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may then want to improve on the configuration, If not then see <ref
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may then want to improve on the configuration, If not then see <ref
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id="cant_find_modem" name="My Modem is Physically There but Can't be
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id="cant_find_modem" name="My Modem is Physically There but Can't be
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Found">. A winmodem may be hard to find and will not work under
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Found">. A winmodem may be hard to find and will not work under
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@ -4111,7 +4111,7 @@ This is one way to crudely transfer files with someone on a MS Windows
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PC who uses HyperTerminal or Terminal (for Windows 3.x or DOS). These
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PC who uses HyperTerminal or Terminal (for Windows 3.x or DOS). These
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two MS programs are something like minicom. Using this simple manual
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two MS programs are something like minicom. Using this simple manual
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method (for Linux-to-Linux or MS-to-Linux) requires two people to be
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method (for Linux-to-Linux or MS-to-Linux) requires two people to be
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present, one one each end of the phone line connection running a
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present, one on each end of the phone line connection running a
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terminal communications program. Be warned that if both people
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terminal communications program. Be warned that if both people
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type at the same time it's chaos. It's a "last resort" way to
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type at the same time it's chaos. It's a "last resort" way to
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transfer files between any two people that have PCs (either Linux or
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transfer files between any two people that have PCs (either Linux or
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@ -5225,7 +5225,7 @@ Thus, disregard what it says about the IRQ, because it's just assuming
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the standard IRQs. This is done, because IRQ detection is unreliable,
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the standard IRQs. This is done, because IRQ detection is unreliable,
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and can be fooled. But if and when setserial runs from a start-up
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and can be fooled. But if and when setserial runs from a start-up
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script, it changes the IRQ's and displays the new (and hopefully
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script, it changes the IRQ's and displays the new (and hopefully
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correct) state on on the startup screen. If the wrong IRQ is not
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correct) state on the startup screen. If the wrong IRQ is not
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corrected by a later display on the screen, then you've got a problem.
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corrected by a later display on the screen, then you've got a problem.
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So, even though I have my <tt/ttyS2/ set at IRQ 5, I still see
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So, even though I have my <tt/ttyS2/ set at IRQ 5, I still see
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@ -5921,7 +5921,7 @@ number of changes per second will be that high.
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Looked at another way, put an imaginary tic mark separating each bit
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Looked at another way, put an imaginary tic mark separating each bit
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(even though the voltage may not change). 38,400 baud then means
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(even though the voltage may not change). 38,400 baud then means
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38,400 tic marks per second. The tic marks at at the instants of
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38,400 tic marks per second. The tic marks at the instants of
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permitted change and are actually marked by a synchronized clock
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permitted change and are actually marked by a synchronized clock
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signal generated in the hardware but not sent over the external cable.
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signal generated in the hardware but not sent over the external cable.
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@ -6032,7 +6032,7 @@ While this HOWTO doesn't cover such modems, some links to documents
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that do may be found at the start of this HOWTO. The next 3
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that do may be found at the start of this HOWTO. The next 3
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sub-sections: DSL, Cable, and ISDN, briefly discuss such modems. For
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sub-sections: DSL, Cable, and ISDN, briefly discuss such modems. For
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both DSL and Cable modems, the basic QAM modulation method is similar
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both DSL and Cable modems, the basic QAM modulation method is similar
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to ordinary analog analog modems. See <ref id="QAM_" name="Combination
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to ordinary analog modems. See <ref id="QAM_" name="Combination
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Modulation">
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Modulation">
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<sect1>Digital Subscriber Line (DSL)
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<sect1>Digital Subscriber Line (DSL)
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