Archtek telecom 5634BIF User manual

5634BIF User’s Manual
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Congratulations on purchasing the most sophisticated modem available. Your modem combines
advanced technology with state-of-the-art features to bring you the modern advanced communications
device available today!
This modem provides the following features.
lData modem
−V.90 & K56flex
−ITU-T V.34 (33.6 kbps), V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21; Bell 212A and
103
−V.42 LAPM, MNP 2-4, MNP 10 error correction
−V.42 bis and MNP 5 data compression
lFax modem send and receive rate up to 14400 bps
−ITU-T V.17, V.29, V.27 ter, V.21 channel 2
−TIA/EIA 578 fax class 1
lV.80 synchronous access mode supports host-based communication protocols
lWorld-class operation
−Call progress
−Blacklisting
−Multiple country support
lVoice/TAM mode
lFull-duplex speakerphone (FDSP) mode
lAudio Span simultaneous audio/voice and data (SP models)
−ITU-T V.61 modulation (4.8 kbps data plus audio)
lFlash memory support
lCaller ID and distinctive ring detect
Trademark
Windows and MS-DOS are trademarks of Microsoft Corporation. IBM PC/AT is a
trademark of International Business Machines. Other product or company names are
trademarks or registered trademarks of their respective holders.

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Table of Contents
CHAPTER 1 INSTALLING THE MODEM............................................................. 4
1.1 CHECKING YOUR COMPONENTS ............................................................................. 4
1.2 WHAT ELSE YOU NEED........................................................................................... 4
1.3 INSTALLING THE MODEM......................................................................................... 4
1.4 REMOVING THE COMPUTER COVER........................................................................ 4
1.5 SETTING THE MODEM SWITCHES............................................................................ 4
1.6 INSERTING THE MODEM.......................................................................................... 7
1.7 CONNECTING TO THE TELEPHONE LINE .................................................................. 7
1.8 CONNECTING TO YOUR FAX MACHINE.................................................................... 8
1.9 CONNECTING TO THE MICROPHONE AND SPEAKER................................................. 8
1.10 VERIFYING YOUR CONNECTION............................................................................. 8
CHAPTER 2 TYPING COMMANDS AND RECEIVING RESPONSES ............. 10
2.1 TYPING A COMMAND............................................................................................. 10
2.2 TO TYPE A COMMAND LINE :.................................................................................. 10
2.3 CORRECTING A TYPING MISTAKE.......................................................................... 10
2.4 READABILITY ........................................................................................................ 10
2.5 TYPING MORE THAN 40 CHARACTERS.................................................................. 10
2.6 OMITTING A PARAMETER....................................................................................... 11
2.7 REPEATING A COMMAND LINE............................................................................... 11
2.8 MODEM RESPONSES............................................................................................ 11
2.9 WORD OR NUMERIC RESPONSES ......................................................................... 12
2.9.1 X0 response set.......................................................................................... 12
2.9.2 X1 response set.......................................................................................... 12
2.9.3 X2 response set.......................................................................................... 12
2.9.4 X3 response set.......................................................................................... 12
2.9.5 X4 response set.......................................................................................... 13
2.10 CORRECTION & COMPRESSION RESPONSES...................................................... 13
CHAPTER 3 USING CONFIGURATION PROFILES.......................................... 17
3.1 STORING A PROFILE ............................................................................................. 17
3.2 RECALLING A PROFILE.......................................................................................... 17
3.3 RESET AND RECALLING PROFILE........................................................................... 18
CHAPTER 4 ERROR CORRECTION AND DATA COMPRESSION................. 19
4.1 ERROR-CORRECTION PROTOCOLS....................................................................... 19
4.2 V.42..................................................................................................................... 19
4.3 CONFIGURING FOR AUTO-RELIABLE OPERATION................................................... 19
4.4 CONFIGURING FOR RELIABLE OPERATION............................................................. 20
4.5 TURNING OFF ERROR-CORRECTION ..................................................................... 20
4.6 MNP5 AND V.42BIS DATA-COMPRESSION ........................................................... 20
CHAPTER 5 LIST OF MODEM COMMANDS.................................................... 21
CHAPTER 6 ......................................................... LIST OF MODEM S-REGISTER 29
6.1 READING AN S-REGISTER VALUE......................................................................... 29
6.2 CHANGING AN S-REGISTER VALUE....................................................................... 29
6.3 S-REGISTER DESCRIPTIONS................................................................................. 29

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CHAPTER 7 HARDWARE QUICK INSTALLATION GUIDE (INTERNAL NON-PNP) 43
7.1 FOR WINDOWS 95.......................................................................................... 43
7.2 FOR WINDOWS 3.1X OR DOS ........................................................................ 43
CHAPTER 8 WINDOWS 95 MODEM DRIVER INSTALLATION (AND PNP) 46
8.1 INSTALL THE MODEM TO WINDOWS 95................................................................ 46
A FCC COMPLIANCE...................................................................................... 48
A.1 FCC NOTICE ....................................................................................................... 48
A.2 FCC REQUIREMENT............................................................................................ 48

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C
Ch ha ap pt te er r 1 1 I In ns st ta al ll li in ng g t th he e m mo od de em m
Chapter 1 provides detailed instructions for installing your modem.
1.1 Checking your components
Unpack your components and make sure you have the following items:
lThe modem.
lA modular telephone cable to connect your modem to the telephone line.
lThis user's manual.
lCommunication software and manual.
When you open your package, make sure all of the above items are included and not
damaged. If you see that any components are damaged, please notify your dealer
immediately.
1.2 What else you need
To complete your data communication system, you will need the following items :
lSome type of communication software, if not included.
lA telephone set and line. (if you do need to use a telephone with your modem)
lYou also need an available card slot in the personal computer.
1.3 Installing the modem
The following instructions explain how to install the modem in a IBM compatible type
personal computer. If you will be installing the modem into a different computer, refer to
the manual that accompanied your computer or contact your computer dealer for
instructions on installing the modem in your personal computer.
1.4 Removing the computer cover
Turn off the personal computer's power. No power must be applied to your computer when
you install the internal modem and computer could be damaged.
Make sure you can freely access the back of the personal computer.
Unscrew the necessary screws to loosen the computer cover. Then set the screws in a
safe place and remove the computer cover.
1.5 Setting the modem switches
Read this section if :
lYou have a serial communication card for another modem.
lYou will be configuring the internal modem for a communication port other than COM1.
If your computer contains a serial or multifunction card, you may have to change the
COM1 address of the modem so that your personal computer can then communicate with

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your serial or multifunction I/O card at one COM port and your modem at another.
The COM port setting is a "logical" address, and has nothing to do with the slot in which
the modem(or serial adapter) is installed.
To change the default COM port setting from COM1 to another setting :
1. Set the switches ( jumpers ) on the modem to specify COM2, COM3, or COM4. Figure
1-1 shows the switch locations on the modem. Table 1-1 describes the setting.
2. Configure your communication software to the new COM port and IRQ settings.
3
4
5
7
9
10
11
12
SHORT
15
IRQ
OPEN
A
B
C
D
5634BIF
Figure 1-1 View of the modem
Table 1-1 modem switch (jumper)settings
COM Port ABCD Hex
Address IRQ
COM1 ON OFF ON OFF 3F8 to 3FF 4
COM2 ON OFF OFF ON 2F8 to 2FF 3
COM3 OFF ON ON OFF 3E8 to 3EF 4,5,9,10,11,12,15
COM4 OFF ON OFF ON 2E8 to 2EF 3,5,9,10,11,12,15

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I/O Port (JS2) Setting
IRQ (JS3,JS4&JS5) Setting
Short Open
Figure 1-2. Jumper diagram
As Table 1-1 shows, a serial device configured to use COM1 will conflict with another
serial device configured to use COM3 which happen to select IRQ4, because these ports
share the same interrupt. To avoid this conflict, one of device should use COM4. Similarly,
a serial device on COM2 will conflict with a serial device using COM4, because these
ports share the same interrupt (IRQ3). In this case, one of the devices should use COM3.
Whichever COM port setting you use, make sure the software you are using is set up to
address that port.
For maximum flexibility, your modem supports IRQ2-5 interrupt requests. Typically, you
will use IRQ3 or IRQ4. However assume your PC has a serial printer configured as COM1
and serial mouse configured as COM2. If you want to use your modem while printing in
the background, you cannot set the modem to COM3 (which uses IRQ4) because the
IRQ4 setting for COM3 conflicts with the printer using COM1, which also uses IRQ4.
Setting the modem to COM4 (IRQ3) conflicts with the mouse using COM2 (IRQ3).
To solve this problem, you can use Jumper 1(JP1) to select IRQ2 or IRQ5( refer to table
1-1). This means that you can print in the background using a printer configured as COM1,
use a mouse configured as COM2, and perform modem activities all at the same time!
IRQ settings 2 through 5 should be used only if you have no other choice. Not all PCs and
DOS versions support IRQ5. IBM PC/AT computers and compatibles should be able to
use IRQ2 or IRQ5, so long as the computer does not have a parallel port set up as LPT2
or another device that is using IRQ2.
4
C
D
A
C
A
B
D
B
9
10
11
3
5
12
15

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1.6 Inserting the modem
The internal modem can fit into any available slot in your personal computer. To insert the
internal modem in your personal computer:
1. Position yourself so that you can easily access the computer's expansion slots.
2. Select any available half-card slot into which you can install the internal modem.
3. Remove any slot cover that may be over the slot. Then remove the slot cover and
keep both in a safe place (you will need the screw to secure the internal modem and
you may need the slot cover if you decide to remove the internal modem in the future).
4. Hold the internal modem above the slot you selected, making sure the modem's edge
connectors are pointing down toward the base of the personal computer (see Figure
1-3).
5. Carefully slide the modem into the slot, applying even pressure to both ends of the
modem. Stop inserting the modem when its gold-plated edge connectors are aligned
with and completely fit into the base of the computer.
6. If you removed a screw from the slot cover, use that screw to secure the modem in the
slot. You may want to test the modem's telephone connection (described in the next
section) before securing your modem.
7. Use the cover-mounting screws to secure the computer cover.
Figure 1-3. Inserting the modem
1.7 Connecting to the telephone line
Use the following procedure to connect your modem to the telephone line:
1. Make sure you have an RJ-11 telephone jack. If you need a modular jack, either
obtain a telephone adapter from a telephone or electronics store and follow the
installation instructions provided with the adapter, or have your local telephone
company replace your existing telephone jack with a modular-type jack and your
existing telephone cord with a modular cord.
2. Unplug your telephone's cable from the wall jack.
3. Take one end of the modular telephone cable supplied with the modem and plug it
into the LINE modular telephone jack on the back of the modem ( see Figure 1-3).
4. Plug the other end of the telephone cord into the telephone jack on the wall, as you

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would any modular telephone.
1.8 Connecting to your Fax Machine
Your modem is so convenient, it provides a second modular telephone jack that lets you
connect your fax machine to the same telephone line the modem is using. This lets you
manually dial data calls or make voice calls when you are not using your modem.
1. Use the following procedure to connect your fax machine to your modem:
2. Connect the telephone's modular cord into the PHONE jack on the back of your
modem (see Figure 1-4).
SPK
LINE
PHONE
MIC
5634BIF
Figure 1-4. Back of the modem
1.9 Connecting to the microphone and speaker
For voice message recording and playing, your modem provides MIC and SPK jacks that
let you connect your microphone and speaker to the modem.
Use the following procedure to connect your microphone and speaker to your modem :
1. Connect the Microphone speaker plug cord into the MIC and SPK jacks on the back of
your modem (see Figure 1-4).
1.10 Verifying your connection
Before you proceed to next step, make sure your connection matches the one shown in
Figure 1-5.

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LINEJACK
JACK
JACK
JACK
SPK
MIC
PHONE
Fax machine
5634BIF
Figure 1-5. Completed modem installation
If you connected the modem to a computer, place the computer into terminal mode and
complete the configuration information required by the software. Refer to your computer
manual to find out the appropriate command to use.
Then use the following procedure to verify that your connections:
1. Type AT and press the Enter key. If your system is operating properly, your modem
sends an OK response to your screen and wait for your next command.
If you did not receive a response, make sure your computer is sending commands to
your modem. If this does not solve your problem, contact your computer dealer.
2. Use your communication software to prepare your computer to dial a call. Then type
AT D x phone number, where x is either T for touch-tone dialing or Pfor pulse dialing
and phone number is the telephone number that your modem is using.
For example, if your modem is connected to the telephone line 555-2121 and Touch-
Tone dialing is supported in your calling area, type ATDT 5552121.
3. Press the Enter key. You should receive a BUSY response and you should hear the
busy signal through the modem speaker because the modem is calling itself.
Your modem is now ready for operation. Refer to the manual that came with your
communication software to begin communications. If you will be communicating directly
with your modem, or if you want to find out more about the modem's operation, proceed to
Chapter 2.
−When you turn off your computer, the modem will turn off automatically. It will turn
on again when you turn on the computer.

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Ch ha ap pt te er r 2 2 T Ty yp pi in ng g c co om mm ma an nd ds s a an nd d r re ec ce ei iv vi in ng g r re es sp po on ns se es s
Chapter 2 describes the format to use when typing modem commands. Chapter 2 also
describes the responses that your modem sends to your computer screen when you
execute, or try to execute, modem commands.
If you will be using a communication software program to make data calls, you will
probably not need to type commands, because your software program will handle these
tasks for you. Similarly, you will probably not see the responses because your software
program may intercept them.
However, if you perform data activities directly with your modem, you will find the format
for typing modem commands and modem response helpful.
2.1 Typing a command
Using commands, you can have your modem perform a variety of activities, such as
dialing or answering a data call or sending a fax. In order to send commands to your
modem, You must type a command line while your modem is in command mode.
2.2 To type a command line :
1. Type AT. These characters must precede every command line. (except when you type
the A/ command, described on page 30)
2. Type the commands you want your modem to execute. A command line can contain
up to 40 characters.
3. Press the Enter key. The modem will then execute the commands on the command
line.
2.3 Correcting a typing mistake
If you make a mistake while typing a command, press the Backspace key to delete the
error. You can delete every command except AT.
2.4 Readability
To make a command line easy to read, you can insert spaces parentheses, hyphens, and
other punctuation in your command line. For example :
AT M3 DT 9, 1(818)555-1234
Your modem ignores spaces and punctuation when executing a command line, but these
characters apply to the 40 characters limit.
2.5 Typing more than 40 characters
If you want to type more than 40 characters on a command line, type a regular command
line (up to 40 characters long) and end it with a semicolon as the last character. When

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you press Enter, your modem executes the commands and returns to command mode, so
you can type your next command line.
2.6 Omitting a parameter
Some commands require a numeric parameter such as 0,1, or 2. For example, the Q
command determines whether your modem sends a modem response after executing a
modem command line :
Q0 tells the modem to send responses.
Q1 tells the modem not to send response.
If you type ATQ and press the Enter key without typing a parameter of 0or 1after the Q,
it's like typing Q0 and the modem will send modem responses.
2.7 Repeating a command line
For your convenience, the last command line you execute remains stored in the modem's
memory until you type a new command line and press the Enter key. If you want to re-
execute the last command, type A/.
When you want to use the A/ command, you don't need to preface it with the AT
characters or end it by pressing the Enter key. Just type A/ to have your modem
automatically re execute the last command line.
The A/ command is particularly useful when you want your modem to re-execute a lengthy
command line or redial a number that was busy.
You can continue using A/ to automatically re-execute the last command line until you
type a new command line that begins with AT or reset your modem, or until your modem
loses power.
2.8 Modem responses
When you send a command to your modem, it sends a response to your computer. For
example, if you send a modem command to your modem, the modem should respond with
OK. You may never see these responses, however because certain communication
software will intercept them before they can be displayed on your computer screen.
This section describes the modem responses returned by the modem when you
communicate directly with the modem. If you will be using a communication software
program to make data calls, you may not see these responses because your software
program will probably intercept the responses.
Response sets
Modem responses can come from one of five response sets. These response sets are
designed X0, X1, X2, X3, and X4.
The response sets determine which modem responses are sent by the modem. They also

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define certain dialing characteristics and how the modem handles dial tones and busy
signals, as described in the following sections.
2.9 Word or numeric responses
Modem responses can appear as words or numbers. Your modem is set up to return word
responses. Word responses are followed by a carriage return and line feed.
If your modem is operating under an application that handles character strings inefficiently
or cannot handle them at all, you can use the V0 command to switch to numeric modem
responses. Numeric responses are followed by a carriage return only.
If you do not want to receive modem responses at all, you can use Q1 command to
disable them. You may want to disable responses entirely if your modem is connected to a
printer and you do not want the modem responses printed.
2.9.1 X0 response set
The X0 response set consists of the first five responses in Table 2-1(see page 19). with
this response set, you receive the CONNECT response for all connections, regardless of
the speed at which they're made.
When you send a Dial command line with this response set in effect, the modem will wait
two seconds after receiving your Dial command, then automatically dial the telephone
number whether or not a dial tone is present This is known as "blind dialing." You may
want to use blind dialing if you will be using the modem in an area that has an irregular or
weak dial tone that your modem cannot always detect.
2.9.2 X1 response set
The X1 response set consists of the all responses in Table 2-1 (see page 19), except NO
DIALTONE, BUSY and NO ANSWER. When you send a Dial command with this
response set in effect, your modem will blind dial call.
2.9.3 X2 response set
The X2 response set consists of all responses in Table 2-1(see page 19), except BUSY
and NO ANSWER.
When you send a Dial command with this response set in effect, your modem will listen
for a dial tone before dialing. If it does not detect a dial tone within five seconds, it hangs
up and returns the NO DIALTONE response.
2.9.4 X3 response set
The X3 response set consists of all responses in Table 2-1 (see page 19), except NO
DIALTONE.
When this response set is in effect and you send a Dial command to your modem, your
modem will blind dial the call. If the telephone number dialed is busy, your modem will

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send the BUSY response.
2.9.5 X4 response set
The X4 response set is the factory-default response set. It consists of the all responses in
Table 2-1(see page 19). This response set allows the modem to detect a dial tone and
also a busy signal.
2.10 Correction & compression responses
If your modem supports the MNP and V.42/V.42bis error-correction and data-compression
protocols, you can use the Wn command to enable the extended responses shown in
Table 2-1(see page 19).
lThe Wcommand that enables negotiation progress responses is not the same
command as the Wdialing modifier used in dial command lines.
The default setting, W0, disables extended responses. With W0, all CONNECT responses
report the DTE speed.
To receive the CARRIER and PROTOCOL responses in Table 2-1, send the W1
command. When this command is in effect, the CONNECT response will show the DTE
speed.
If you want the CONNECT response to show the DCE speed rather than the DTE speed,
send W2 command. With this command, extended responses will be disabled.
Modems that support the MNP and V.42/V.42bis error-correction and data-compression
protocol can also use the \V1 command to append /ARQ to the end of all CONNECT
responses when your modem makes an error-correction data connection with a remote
modem.
If you do not want /ARQ appended to the end of CONNECT responses when an error-
correction data connection is made, send the \V0 command.
Table 2-1. Modem responses
Word Response Number
Response Meaning
OK 00 Modem successfully executed a command line.
CONNECT 01 If X0 is in effect, modem made a data
connection at 0-300,1200, 2400 , 9600,
19200bps, Otherwise modem made a data
connection at 0-300 bps.
RING 02 Modem detected an incoming ring.
NO CARRIER 03 Remote carrier signal not detected.
ERROR 04 You typed an invalid command line, a checksum
error occurred, or your command line is too
long.
CONNECT 1200 05 Modem made a 1200bps data connection.

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Word Response Number
Response Meaning
NO DIALTONE 06 Modem has not detected a dial tone. (this
response is enabled when X2, X4 or the W dial
modifier is in effect.
BUSY 07 Modem detected a busy signal. (this response is
enabled when X3 or X4 is in effect.
NO ANSWER 08 Modem did not detect silence when dialing a
command line containing the @ dial modifier.
CONNECT 600 09 Modem made a data connection at 600bps.
CONNECT 2400 10 Modem made a data connection at 2400bps.
CONNECT 4800 11 Modem made a data connection at 4800bps.
CONNECT 9600 12 Modem made a data connection at 9600bps.
CONNECT 7200 13 Modem made a data connection at 7200bps.
CONNECT 12000 14 Modem made a data connection at 12000bps.
CONNECT 14400 15 Modem made a data connection at 14400bps.
CONNECT 19200 16 Modem made a data connection at 19200bps.
CONNECT 38400 17 Modem made a data connection at 38400bps.
CONNECT 57600 18 Modem made a data connection at 57600bps *
CONNECT
115200 19 Modem made a data connection at 115.2kbps.*
CONNECT
75TX/1200RX 22 Modem made a data connection at 75bps transmit and 1200bps receive.
CONNECT
1200TX/75RX 23 Modem made a data connection at 1200bps transmit and 75bps receive.
DELAYED 24 Modem return this result code when a call fails
to connect and the number dialed is considered
"delayed" due to country blacklisting
requirement
BLACKLISTED 32 Modem return this result code when a call fails
to connect and the number dialed is considered
"blacklisted"
FAX 33 Modem connection is established in fax mode
DATA 35 Modem connection is established in data mode.
CARRIER 300 40 Carrier detected at 300bps.**
CARRIER 1200/75 44 Carrier - transmit 1200bps, receive 75bps.**
CARRIER 75/1200 45 Carrier - transmit 75bps, receive 1200bps.**
CARRIER 1200 46 Carrier detected at 1200bps.**
CARRIER 2400 47 Carrier detected at 2400bps.**
CARRIER 4800 48 Carrier detected at 4800bps.**
CARRIER 7200 49 Carrier detected at 7200bps.**
CARRIER 9600 50 Carrier detected at 9600bps.**
CARRIER 12000 51 Carrier detected at 12000bps.**
CARRIER 14400 52 Carrier detected at 14400bps.**
CARRIER 16800 53 Carrier detected at 16800bps.**
CARRIER 19200 54 Carrier detected at 19200bps.**
CARRIER 21600 55 Carrier detected at 21600bps.**

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Word Response Number
Response Meaning
CARRIER 24000 56 Carrier detected at 24000bps.**
CARRIER 26400 57 Carrier detected at 26400bps.**
CARRIER 28800 58 Carrier detected at 28800bps.**
CONNECT 16800 59 Modem made a data connection at 16800bps.
CONNECT 21600 61 Modem made a data connection at 21600bps.
CONNECT 24000 62 Modem made a data connection at 24000bps.
CONNECT 26400 63 Modem made a data connection at 26400bps.
CONNECT 28800 64 Modem made a data connection at 28800bps.
COMPRESSION:
CLASS 5 66 MNP compression negotiated.**
COMPRESSION:
V.42BIS 67 V.42bis compression negotiated.**
COMPRESSION:
NONE 69 No compression negotiated.**
PROTOCOL:
NONE 70 Asynchronous operation.**
PROTOCOL:
LAPM 77 V.42 LAPM.**
CARRIER 31200 78 Carrier detected at 31200bps.**
CARRIER 33600 79 Carrier detected at 33600bps.**
PROTOCOL: ALT 80 MNP negotiated.**
CONNECT 33600 84 Modem made a data connection at 33600bps.
CONNECT 31200 91 Modem made a data connection at 31200bps.
CARRIER 32000 150 Carrier detected at 32000bps.
CARRIER 34000 151 Carrier detected at 34000bps.
CARRIER 36000 152 Carrier detected at 36000bps.
CARRIER 38000 153 Carrier detected at 38000bps.
CARRIER 40000 154 Carrier detected at 40000bps.
CARRIER 42000 155 Carrier detected at 42000bps.
CARRIER 44000 156 Carrier detected at 44000bps.
CARRIER 46000 157 Carrier detected at 46000bps.
CARRIER 48000 158 Carrier detected at 48000bps.
CARRIER 50000 159 Carrier detected at 50000bps.
CARRIER 52000 160 Carrier detected at 52000bps.
CARRIER 54000 161 Carrier detected at 54000bps.
CARRIER 56000 162 Carrier detected at 56000bps.
CONNECT 32000 165 Modem made a data connection at 32000bps.
CONNECT 34000 166 Modem made a data connection at 34000bps.
CONNECT 36000 167 Modem made a data connection at 36000bps.
CONNECT 38000 168 Modem made a data connection at 38000bps.
CONNECT 40000 169 Modem made a data connection at 40000bps.
CONNECT 42000 170 Modem made a data connection at 42000bps.

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Word Response Number
Response Meaning
CONNECT 44000 171 Modem made a data connection at 44000bps.
CONNECT 46000 172 Modem made a data connection at 46000bps.
CONNECT 48000 173 Modem made a data connection at 48000bps.
CONNECT 50000 174 Modem made a data connection at 50000bps.
CONNECT 52000 175 Modem made a data connection at 52000bps.
CONNECT 54000 176 Modem made a data connection at 54000bps.
CONNECT 56000 177 Modem made a data connection at 56000bps.
* These response are displayed when the W0 or W1 command is in effect.
** These responses are displayed when the W1 command is in effect

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C
Ch ha ap pt te er r 3 3 U Us si in ng g c co on nf fi ig gu ur ra at ti io on n p pr ro of fi il le es s
Your modem is preset so that you can begin transferring data files as soon as you install
the modem and load your communication software.
If you dialing and answering requirements do not match the modem's default configuration
profile, you can create your own profiles and store them safely in your modem's
nonvolatile memory. The profiles will be saved, even when you turn off your modem.
When you need to use a certain profile, send the appropriate command.
You can save two custom configuration profiles in your modem's nonvolatile memory. You
save profiles using &Wn command. The n can be the number 0 or 1, which corresponds
to the location in nonvolatile memory where you want the profile stored.
Using the &Wn command, you can store the following commands (refer to Chapter 5 for
description of these commands):
B1, T, E1, F0, L2, M1, Q0, V1, X4, Y0, &C0, &D0, &G0, &J0, &K3, &L0, &P0, \A3, \B2,
%C1, \N3 .........
You can also store the following register values (refer to Chapter 6 for a description of
these registers) :
S0=0, S2=43, S6=2, S7=30, S8=2, S9=6, S10=14, S11=95, S12=50, S18=0, S25=5 ...
3.1 Storing a profile
The following example shows how you can store a profile. Assume that you want to save
the following commands in profile 0:
X1 E0 &C1 &D0 &M0 S0=3
To do so :
1. Type AT
2. Type the commands shown above
3. Type the &W0 command as the last command on the command line to save these
commands as user Profile 0.
4. Press the Enter key. This custom configuration profile is now saved under user Profile
0.
3.2 Recalling a profile
After you store a custom configuration profile, you can recall it using the AT&Yn
command. For example, to recall profile 0 :
Type AT&Y0
1. Press the Enter key. The next time you turn on or reset your modem, it will drive its

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operating characteristics from Profile 0.
2. To recall Profile 1 instead of Profile 0, type AT&Y1 instead of AT&Y0.
3.3 Reset and recalling profile
If you prefer, you can use ATZn command to reset the modem and load a stored
configuration profile : For example, to reset your modem and recall Profile 0 :
1. Type ATZ0
2. Press the Enter key.
Returning to the default profile
1. To return to the factory default profile 0:
2. Type AT&F0
Press the Enter key. Your modem returns to basic asynchronous operation, which is the
profile in effect when you received your modem. The following table lists the modem's
default profile.
Setting Default Obtained
from Memory
Auto-answer Disable Yes
Backspace character 08 No
Bell / CCITT compatibility at 1200 bps Bell 212A Yes
Busy signal detect Enabled Yes
Carriage return character 13 No
Line feed character 10 No
Communication rate 57600bps Yes
Data Set Ready option Always Yes
Data Terminal Ready option DTR hang up Yes
Data Terminal Ready pulse width 0.5 seconds Yes
Echo On Yes
Escape character definition 43 (+++) Yes
Guard tones Disabled Yes
Long space disconnect Disabled Yes
Parity None Yes
Pulse make/break ratio 39/61 (US setting) Yes
Responses Word Yes
Response enabled All Yes
RTS-to-CTS delay 50 milliseconds Yes
Speaker status On, but off when carrier
detected Yes
Speaker volume Medium Yes
Test timer setting 0 second Yes
Wait for carrier after dialing 50 seconds Yes
Wait for dial tone 2 seconds No
Wait for dial tone before dialing Enabled Yes

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C
Ch ha ap pt te er r 4 4 E Er rr ro or r c co or rr re ec ct ti io on n a an nd d d da at ta a c co om mp pr re es ss si io on n
Your modem supports sophisticated MNP 1- 4 and V.42 error- correcting protocols. These
protocols ensure the transmission of error-free data −even over noisy, error- prone
telephone lines. Your modem also supports the V.42bis and MNP 5 data-compression
protocols, which maximizes data throughput and significantly reduces the time needed to
exchange data.
4.1 Error-correction protocols
Your modem includes two error-correction protocols:
•MNP level 1 through 4
•CCITT V.42
When these protocols are used, the two modems perform calculations on each "packet" of
data being exchanged and compare their values. If the values do not match, the receiving
modem requests the sending modem to re transmit the packet.
MNP is an acronym for Microcom Networking Protocol. MNP detects and corrects errors
that occur when data is exchanged between two systems. Errors can result from
telephone- line noise and other signal distortions.
4.2 V.42
V.42bis the accepted international standard for error correction, ratified by ITU-T in
January 1990. It is generally felt that the handshake and protocol establishment process
of V.42 is superior to that MNP 4. Therefore, it will provide better initial connections on
poor quality telephone lines.
Moreover, while the effective data speed of V.42 and MNP 4 are almost identical over
noise-free telephone lines, V.42 provides significantly better performance than the ITU-T-
specified MNP4 over noisy telephone lines.
4.3 Configuring for auto-reliable operation
Auto-reliable operation is the modem's default configuration, so if you haven't given the
modem any \N commands, it should already be in auto-reliable mode.
Auto-reliable mode lets your modem communicate with both MNP/V.42/V.42bis modems
and modems that do not use MNP/V.42/V.42bis :
1. Type AT\N3%C3 (Factory Setting)
2. Press the Enter key. Your modem responds with OK. When your modem originates or
answers calls, it will try to make a V.42bis/V.42 connection. If either or both fail, your
modem will try to make an MNP connection. If that fails, your modem will try to make a
normal connection that does not use error correction.

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20
4.4 Configuring for reliable operation
To communicate with remote MNP modems only :
1. Type AT\N5
2. Press the Enter key. Your modem responds with OK. When your modem originates or
answers calls, it will try to make an MNP connection. If that fails, your modem will
hang up and return to command mode.
To communicate with remote V.42 modems only :
1. Type AT\N4
2. Press the Enter key. Your modem responds with OK. When your modem originates or
answers calls, it will try to make a V.42/V.42bis connection. If that fails, your modem
will hang up and return to command mode.
4.5 Turning off error-correction
To turn off the MNP/V.42 error correction and communicate with non-
MNP/V.42 modems:
1. Type AT\N0 and press the Enter key to return to standard operation with buffering. or
AT\N1 and press the Enter key to return to standard operation without buffering
2. Your modem responds with OK.
4.6 MNP5 and V.42bis data-compression
There are two major data-compression protocols used in data communications, MNP5 and
V.42bis. MNP5 was the first data-compression protocol to be developed and provides a
data-compression ratio of 2:1.
In January 1990, ITU-T ratified the V.42bis data-compression protocol as the international
standard. V.42bis performs significantly better than MNP5, providing a data-compression
ratio of approximately 3:1 −and in some case, up to 4:1.
By supporting both types of data-compression protocols, your modem can communicate
with the installed base of MNP5 and V.42bis modems and modems.
To communicate with remote MNP5 modems only
1. Type AT%C1
2. Press the Enter key. Your modem responds with OK. When your modem originates or
answers calls, it will try to make an MNP5 connection. If that falls, your modem will
hang up and return to command mode.
To turn off V.42bis and MNP5 data compression:
1. Type AT%C0 ; Press the Enter key. Your modem responds with OK.