MaxTech 28 User manual

User's Manual
Contents
Section One Introduction ............................ 1
Section Two Installation .............................. 1
Section Three AT Command Set ................... 6
Section Four S Register Summary ............ 11
Section Five Result Codes.......................... 12
Section Six Troubleshooting .................... 15
Section Seven Specifications ........................ 17
Section Eight Support And Service ............ 17
Section Nine FCC, DOC, Copyright And
Other Notices ........................ 17
High Performance
V.34 28,800 BPS
Internal FAX/Data
Modem
Part #MAN018 Rev. 1.0 RC288/R6

1
Section One - Introduction
The 28.8 Kbps Series FAX/Data Modem products
connect your computer to all popular high speed modems
available today. The modem supports the V.34 protocol to
supply the highest speed connections possible. It also uses
V.42 or MNP 2-4 error correction for flawless connections
and V.42bis or MNP 5 data compression for increased
throughput.
Thismanualdescribesthehardwareinstallationproce-
duresfor yournew modemproduct. Additionalinformation
on AT commands and S-registers are provided so that your
systemcanbecustomizedforaparticularoperatingenviron-
ment.
Section Two - Installation
This section will provide step by step instructions on
how to install your new 28.8 Kbps FAX/Data modem.
Installation of this modem product is a two-step process
consisting of actual hardware installation and communica-
tion software installation and configuration.
2.1 Unpacking Your Modem
Beforeyoubeginyourinstallation,becertainthatyou
have all the items listed below. This package contains:
• A modem • A telephone cable
• User's manual • Software for the modem
• Software user's manual
2.2 Hardware Installation
Installation of this modem requires opening and ma-
nipulating your PC. Exercise caution at all times when
working with AC powered and static-sensitive equipment.
Turn off and unplug your PC before installation. Discharge
any static electricity from your body by touching any metal
surface.
1. Turnoff and unplug your computerfrom theAC outlet.
2. Determine how many serial ports are built into your com-
puter(examinethebackofyourcomputer).RefertoFigure
2-1toidentifycommonserialports.
3. If you have one or more serial ports on the back of your
computer,reconfigureyourmodem.Yourmodemisshipped

2
set to COM1 on IRQ4. Reconfigure the modem to either
COM3/IRQ5or COM4/IRQ2(refer to Table 2-1 in Sec-
tion 2.4).
4. Remove your computer's cover (refer to your computer's
ownermanual).
5. Selectanyavailablehalf-card
slot,andthenremovetheslot
cover(refertoFigure 2-2).
6. Carefullyslidetheinternalmo-
dem into the slot you have
chosen, applying even pres-
sureuntilthe modemiscom-
pletelyseatedintheslot.
7. Fasten the retaining bracket
with the screw from the slot
cover.Makesurethemodem
isproperlyaligned. Storethe
slotcoverforfutureuse.
8. Replacethecomputercoverandpluginyourcomputer.
9. Connect the telephone cable from the modem (“LINE”
connector)tothetelephonewalljack.
10. Optionally, connect your telephone to the modem's
“PHONE”connector.
11. Turn your computeron.Your modemisnow installed.
2.3 Software Installation/Configuration
Youarenowreadytoinstallandconfigurethecommu-
nication software. Refer to your software manual for instal-
lation procedures. Your software must be configured to
communicate with the modem on the same COM port and
IRQ line used by the modem.
If you are using Microsoft Windows 3.x and have
changedthemodem'soperatingsettingfromthedefaultCOM1/
IRQ4toCOM3/IRQ5orCOM4/IRQ2toavoidaconflict,you
must use Windows' Control Panel (in the “Main” Group
withinProgramManager)toconfigureWindowstorecognize
the new settings before installing any software. In Control
male connector
Figure 2-1 Common Serial Ports
Figure 2-2
Expansion
Slots

3
Panel, double-click on Ports. Click once on the icon for the
Com port you have set your modem to. Click the Settings
button. Click the Advanced button. The Base I/O Port
AddressshouldalreadybesetbyWindowstotheCOMport
addressusedbythe modem (refer to Table2-1).Changethe
Interrupt Request Line (IRQ) to match the IRQ on the
modem. If you have set the modem to COM4/IRQ2, do not
selectIRQ2.YouwillneedtosettheIRQinControlPanelto
IRQ9forWindowstorecognizethemodem.(Inanoperating
system designed for 286 or better machines, IRQ 9 is
equivalent(redirected) toIRQ2.)
A modem setting which skips one or more COM port
assignments requires special attention in the Windows 3.x
Control Panel. For example, if your computer is equipped
with two serial ports (COM1 and COM2) and have set the
modem to COM4 instead of COM3, the Control Panel
settings for COM4 may say Default. In this case, Windows
3.x will operate the modem as the third serial device and
recognize it as “COM3” (This unusual COM port reassign-
ment does not occur in future releases of Windows). The
correct COM4 address (2E8) has been placed into the
ControlPanelCOM3position.ConfiguretheCOM3entryin
ControlPanelbychangingtheIRQboxtomatchtheIRQthat
has been set on the modem. (When running any Windows
3.x-basedcommunicationor fax programs,selectCOM3 as
the COM port for the modem.)
Wesuggest thefollowingcommunication parameters
when you first use your data communication software.
Consult the software manual for information on using these
and other parameters/features.
38,400 bps; 8 data bits; no parity; 1 stop bit; RTS/
CTS flow control set to “on;” initialization string:
AT&F
We suggest that a “Generic Class 2” modem type
should be selected in your fax software.
2.4 COM Port and Interrupt Settings
If your computer is equipped with one or more serial
ports, you will need to change the COM Port setting on the
modem (to either COM 3 or 4), or disable the PC's built-in
COM port.

4
AnIRQ(interruptrequest)isa signal generated by an
I/Odevicethatnotifiesthecomputerofincomingdata.Your
internal modem is capable of accessing IRQs 2, 3, 4, and 5.
I/O devices in your computer cannot share an IRQ with
another device at the same time. Since IRQs can not be
sharedatthesametime,COM3isgenerallyconfiguredtouse
IRQ5,andCOM4touseIRQ2.ThisavoidssharingofIRQs
with COM 1 (IRQ4) and COM 2 (IRQ3).
TochangethedefaultCOMPortorIRQsettingsfrom
COM1/IRQ4toanothersetting,locatetheSwitchBlock on
your internal modem (Figure 2-3). Refer to Table 2-1 to
configure the Switch Block to the COM Port and IRQ
combination needed for your application. Any time the
COM or IRQ setting for the modem is changed, the
settings in the software must be changed to match.
COM Port IRQ SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6
1 (3F8)
default 4ON ON OFF OFF ON OFF
2 (2F8) 3 OFF ON OFF ON OFF OFF
3 (3E8) 5 ON OFF OFF OFF OFF ON
4* ON OFF OFF OFF ON OFF
4 (2E8) 2(9)** OFF OFF ON OFF OFF OFF
3* OFF OFF OFF ON OFF OFF
* UsetheseIRQs onlyifyour softwarecannotaddress IRQ5or IRQ2
** WhenusingWindows withthemodem setforIRQ2, selectIRQ9in
ControlPanel
SW1
Figure 2-3 Switch Block SW1 Location
Table 2-1 SW1 Settings

5
2.5 Using the Fax Capabilities of the Modem
Your modem has built-in advanced FAX functions.
Thecommandstocontrolthesefunctionsaresoftwaredriven
and are not normally accessible to the user. Consult your
FAX software manual about procedures on using FAX
features.
2.6 Testing Your Modem After Installation
In order to test your modem you should be familiar
with your communication software. Load and set up your
communication software and enter into “terminal mode.”
MakesurethattheCOMPortandIRQsettingsofthemodem
match the software. Type AT on your terminal screen and
press ENTER. You may see “AATT” or nothing on the
screen.Ineithercase,themodemshouldrespondwithanOK
or0.Ifitdoesnot,pleaserefertoSection2.4forinformation
on COM Ports and IRQ’s or Section 6 for troubleshooting
information.
2.7 Using Your Modem
Thecommunicationsoftware included withyourmo-
dem product provides a user friendly interface to access the
faxanddatafunctionsofyourmodem.Thissoftwareshould
be sufficient for all of your communication needs. There
maybetimeswhenyouneedto accessthemodemmanually
via modem commands. Read Section 3 for a summary
description of the modem command set before manually
accessing the modem. You may want to read the software
manual first, however, as the software may already provide
a user friendly method of accessing the functions you need
(i.e. dialing or answering calls).
2.8 Where To Go From Here
You should familiarize yourself with the functions
available from the included software by reading its manual.
You will be accessing most, if not all, of the modem's
functions from this software. You may also use any other
commercially available communication software with the
modem. Read Section 3 ONLY if you are interested in
accessingthemodemmanually,andnotthroughtheincluded
software.Section4and5containreferencematerial,andcan
be skipped. If you have difficulties getting your modem to
work, read Section 6, Troubleshooting to find answers to

6
commonly asked questions and problems.
Section Three - AT Command Set
3.1 Executing Commands
Commands are accepted by the modem while it is in
Command Mode. Your modem is automatically in Com-
mand Mode until you dial a number and establish a connec-
tion. Commands may be sent to your modem from a PC
running communication software or any other terminal de-
vices.
Yourmodemiscapableofdatacommunicationatrates
of: 300, 1200, 2400, 4800, 9600, 14400, 19200, 38400,
57600,and115200bps.MakesureyourCOMportbaudrate
settingsinyourcommunicationssoftwareissettooneofthe
abovespeeds.
3.2 Command Structure
AllcommandssenttothemodemmustbeginwithAT
andendwithENTER. Allcommandsmaybetypedineither
upper or lower case, but not mixed. To make the command
line more readable, spaces may be inserted between com-
mands. If you omit a parameter from a command that
requires one, it is just like specifying a parameter of 0.
Example: ATH[ENTER]
This command causes your modem to hang up.
3.3 Basic AT Commands
Inthefollowinglistings,alldefaultsettingsareprinted
in bold text.
Command Function
AManuallyanswerincomingcall.
A/ Repeat last command executed. Do not precede A/
withATorfollow withENTER.
B0 CCITTmode
B1 Bell mode
B2 Autoscanmode
B3 CCITT V.23 mode only
B4 300bpsconnectiononly
B5 1200bpsconnectiononly

7
B6 2400bpsconnectiononly
B7 4800bpsconnectiononly
B8 9600bpsconnectiononly
B9 14400bpsconnectiononly
B10 16800bpsconnectiononly
B11 19200bpsconnectiononly
B12 21600bpsconnectiononly
B13 24000bpsconnectiononly
B14 26400bpsconnectiononly
B15 28800bpsconnectiononly
D_ 0 - 9, A-D, # and *
L lastnumberredial
P pulsedialing
T touch-tonedialing
W waitforseconddialtone
, pause
@ waitforfivesecondsofsilence
! flash
; returntoCommandModeafterdialing
DS=n Dialoneofthefourtelephonenumbers(n=0-3)stored
inthemodem’snon-volatilememory.
E0 Commandsarenotechoed
E1 Commandsareechoed
+++ Escape Characters - Switch from Data Mode to
CommandMode
H0 Forcemodemon-hook(hangup)
H1 Forcemodemoff-hook(makebusy)
I0 Displayproduct-identificationcode
I1 FactoryROMchecksumtest
I2 Internalmemorytest
I3 FirmwareID
I4 ReservedID
L0 Lowspeakervolume
L1 Lowspeakervolume
L2 Mediumspeakervolume
L3 Highspeakervolume
M0 Internalspeakeroff
M1 Internal speaker on until carrier detected
M2 Internalspeakeralwayson
M3 Internalspeakeronuntilcarrierdetectedandoffwhile
dialing
O0 Return to Data Mode

8
O1 Return to DataMode andinitiatean equalizerretrain
O2 Sameas O1withspeedfall forward
O3 Same asO1with speedfall backward
PSetPulse dialas default
Q0 Modem sends responses
Q1 Modemdoesnotsendresponses
Sr? Readand displayvalue inregister r.
Sr=n Set register r to value n (n = 0-255).
T Set Tone Dial as default
V0 Numericresponses
V1 Word responses
X0 HayesSmartmodem300compatibleresponses/blind
dialing
X1 SameasX0plusallCONNECTresponses/blinddialing
X2 Sameas X1plusdialtone detection
X3 SameasX1plusbusydetection/blinddialing
X4 Allresponsesanddialtoneandbusysignaldetection
Y0 Modemdoesnotsendorrespond tobreak signals
Y1 Modem sends break signal for four seconds before
disconnecting
Z0 Resetandretrieveactiveprofile0
Z1 Resetandretrieveactiveprofile1
Extended AT Commands
&C0 Force Carrier Detect Signal High (ON)
&C1 Turnon CDwhenremote carrierispresent
&D0 Modem ignores the DTR signal
&D1 ModemreturnstoCommandModeafterDTRtoggle
&D2 Modemhangsup,returnstotheCommandModeafter
DTRtoggle
&D3 ResetsmodemafterDTRtoggle
&E0 Disableautomaticfallforward/back
&E1 Enableautomaticfallforward/back
&F0 Recall factory default configuration (V.42bis/
hardwareflowcontrolenabled)
&F1 Recall factory default with software flow control
enabled
&F2 Recall factory default with hardware flow control
enabled(sameas&F)
&F3 Same as &F1 except for Macintosh computers (&F1

9
with&D0)
&F4 Same as &F2 except for Macintosh computers (&F2
with&D0)
&F5 Same as &F except V.42bis and flow control are
disabled
&G0 Guardtonedisabled
&G1 550 Hz guard tone
&G2 1800 Hz guard tone
&H Displayhelpscreen
&L0 Modem is set up for dial-up line operation
&L1 Modemissetupforleased-lineoperation
&L2 ModemissetupforAuto-connectleased-lineoperation
&M0 Asynchronousoperation
&O0 Disableoriginate-only mode
&P0 US setting for off-hook-to-on-hook ratio
&P1 UKandHongKongoff-hook-to-on-hookratio
&S0 Force DSR Signal High (ON)
&S1 DSRoffincommandmode,oninon-linemode
&T0 Endstestinprogress
&T1 PerformLocalAnalogLoopbackTest
&T3 PerformLocalDigitalLoopbackTest
&T4 Grant Remote Digital Loopback Test request by
remote modem
&T5 DenyRemoteDigitalLoopbackTestrequest
&T6 PerformaRemoteDigitalLoopbackTest
&T7 Perform a Remote Digital Loopback Test and Self-
Test
&T8 PerformLocalAnalogLoopbackTestandSelf-Test
&V DisplaysActiveandStoredProfiles
&W0 StorestheactiveprofileasProfile0
&W1 StorestheactiveprofileasProfile1
&Y0 Configuration Profile 0 active upon Power on or
reset
&Y1 ConfigurationProfile1activeuponPoweronorreset
&Zn=x Storephonenumberxintonon-volatileRAM(n=0-3)
%D0 DisableClear-downsignal
%D1 EnableClear-downsignal
%E0 Disableauto-retrain
%E1 Enableauto-retrain

10
%LnSet transmit level to -ndBm Default = 12.(n=0-15)
%M0 AutodetectV.34and V.FCnegotiationsignals
%M1 AutodetectV.34negotiationsignalsonly
%M2 AutodetectV.FCnegotiationsignalsonly
%P0 DisablePower-onAuto-connect
%P1 EnablePower-onAuto-connect
%S0 DisableCall-backSecurity
%S1 EnableCall-backSecuritywithpasswordcheck
%S2 EnablePasswordcheckonly
\P=x Stores password x(x= ASCII characters 1 through
127excluding“?”, maximum7characters)into non-
volatileRAM
MNP/V.42/V.42bis Commands
%An Setauto-reliablefallbackcharacterton(n=0to127).
Requiresthe\C2setting
%C0 DisableV.42bis/MNPClass5datacompression
%C1 Enable V.42bis/MNP Class 5 data compression
\A0 64-charactermaximumMNPblocksize
\A1 128-charactermaximumMNPblocksize
\A2 192-charactermaximumMNPblocksize
\A3 256-character maximum MNP block size
\Bn Senda1/10secondlinebreaktothemodem(n=1-9).
Atnormalconnect, thedefaultis3
\C0 Do not buffer data during LAPM/MNP
handshaking
\C1 Buffer all data for 4 seconds, until receiving 200
charactersoruntil apacketisdetected
\C2 Do not buffer data; switch to normal mode when
fallbackcharacterisdetected
\E0 Do not echo data during a normal link
\E1 Echo data during a normal link
\G0 Disable DCE flow control
\G1 EnableDCEflowcontrol
\J0 Disableserialportdatarateadjustment(keephigh
dataratebetweenDTEandmodem,regardlessof
modem-to-modemdatarate)
\J1 Enable serial port data rate adjustment so serial data
rate automatically adjusts to match the modem-to-
modemdatarate

11
\Kn Set break control (n= 0-5). Default is 5
\N0 Normaldata-linkonly
\N1 Directdata-linkonly
\N2 MNP data link only
\N3 MNP or Normal data link
\N4 V.42 data link only
\N5 V.42 or MNP data link only
\N6 V.42/MNP/Normaldatalink
\O Initiate reliable link during a normal link
\Q0 Turnoffflowcontrol
\Q1 XON/XOFFsoftwareflowcontrol
\Q2 CTSsignalunidirectionalhardwareflowcontrol
\Q3 RTS/CTS signal bi-directional hardware flow
control
\Q4 Unidirectional XON/XOFF software flow control
(modemtohost)
\Tn Inactivity timer (n = 0 to 90 minutes). Default is 0
\U Acceptreliable linkduring a normallink
\V0 ReportDCEspeedbutdonotsendextendedresponses
\V1 Report DCE speed with extended responses
\V2 ReportDTEspeedbutdonotsendextendedresponses
\V3 ReportDTEspeedwithextendedresponses
\X0 Process XON/XOFF but don’t pass through
\X1 ProcessXON/XOFFandpassthrough
\Y Switchtoreliable linkfromnormal link
\Z End the reliable connection and switch to normal
operation
Section Four - S Registers
Your modem has 29 registers, designated S0 through
S28.Table4-1showstheregisters,theirfunctions,andtheir
defaultvalues.Someregisterscanhavetheirvalueschanged
by commands. If you use a command to change a register
value, the command remains in effect until you turn off or
resetyourmodem.Yourmodemthenrevertstotheoperating
characteristicsspecifiedinitsnon-volatilememory. Referto
Section3forinformationonhowtousetheATcommandsto
manipulate the S registers.

12
Table 4-1 S - Registers
Register Function Range/units Default
S0 Auto-answerRing 0-255/rings 0
S1 Ringcounter 0-255/rings 0
S2 Escapecodecharacter 0-127/ASCII 43
S3 Carriagereturncharacter 0-127/ASCII 13
S4 Linefeedcharacter 0-127/ASCII 10
S5 Backspacecharacter 0-32, 127/ASCII 8
S6 Dialtone waittime 2-255/seconds 2
S7 Remotecarrierwaittime 1-255/seconds 50
S8 Commapausetime 0-255/seconds 2
S9 Carrierdetectresponsetime 1-255/0.1second 6
S10 Carrierlosstime 1-255/0.1second 14
S11 Touch-tonedialingspeed 50-255/0.001second 95
S12 Escapecharacterguardtime 0-255/0.02second 50
S13 Reserved
S14 Echo,response,dialing, Bit-mappedregister 138
originate/answer
S15 Reserved
S16 Modemtests Bit-mappedregister 0
S17 Reserved
S18 Lengthofmodemtests 0-255/seconds 0
S19-20Reserved
S21 CTS, DTR, DCD, DSR Bit-mappedregister 4
andLongSpaceDisconnect
S22 Speakerandresponse Bit-mappedregister 117
S23 RemoteDigitalLoopback Bit-mappedregister 55
Request,datarate,parity
S24 Sleepmodetimer 0-255/seconds 0
S25 DTR delay 0-255 /0.01 second 5
S26 RTS/CTSdelayinterval 0-255 /0.01 second 1
S27 Asynchronous/Bell Bit-mappedregister 73
CCITTModes
S28 Make/breakratio Bit-mappedregister 0
Section Five - Result Codes
BASIC RESPONSE CODES
OK 0
CONNECT 1
RING 2
NOCARRIER 3
ERROR 4
CONNECT1200 5
NODIALTONE 6
BUSY 7
NOANSWER 8
CONNECT2400 10
CONNECT4800 11
CONNECT7200 12

13
CONNECT9600 13
CONNECT12000 14
CONNECT14400 15
CONNECT16800 60
CONNECT19200 61
CONNECT21600 62
CONNECT24000 63
CONNECT26400 64
CONNECT28800 65
CONNECT38400 66
CONNECT57600 67
CONNECT115200 68
CONNECT1200/75 48
CONNECT75/1200 49
EXTENDED RESPONSE CODES
CONNECT300/MNP 16
CONNECT1200/MNP 17
CONNECT2400/MNP 18
CONNECT4800/MNP 19
CONNECT7200/MNP 20
CONNECT9600/MNP 21
CONNECT12000/MNP 22
CONNECT14400/MNP 23
CONNECT16800/MNP 70
CONNECT19200/MNP 71
CONNECT21600/MNP 72
CONNECT24000/MNP 73
CONNECT26400/MNP 74
CONNECT28800/MNP 75
CONNECT38400/MNP 76
CONNECT57600/MNP 77
CONNECT115200/MNP 78
CONNECT300/MNPCOMPRESSED 24
CONNECT1200/MNPCOMPRESSED 25
CONNECT2400/MNPCOMPRESSED 26
CONNECT4800/MNPCOMPRESSED 27
CONNECT7200/MNPCOMPRESSED 28
CONNECT9600/MNPCOMPRESSED 29
CONNECT12000/MNPCOMPRESSED 30
CONNECT14400/MNPCOMPRESSED 31
CONNECT16800/MNPCOMPRESSED 80
CONNECT19200/MNPCOMPRESSED 81
CONNECT21600/MNPCOMPRESSED 82
CONNECT24000/MNPCOMPRESSED 83
CONNECT26400/MNPCOMPRESSED 84
CONNECT28800/MNPCOMPRESSED 85
CONNECT38400/MNPCOMPRESSED 86
CONNECT57600/MNPCOMPRESSED 87
CONNECT115200/MNPCOMPRESSED 88

14
CONNECT300/V42 32
CONNECT1200/V42 33
CONNECT2400/V42 34
CONNECT4800/V42 35
CONNECT7200/V42 36
CONNECT9600/V42 37
CONNECT12000/V42 38
CONNECT14400/V42 39
CONNECT16800/V42 90
CONNECT19200/V42 91
CONNECT21600/V42 92
CONNECT24000/V42 93
CONNECT26400/V42 94
CONNECT28800/V42 95
CONNECT38400/V42 96
CONNECT57600/V42 97
CONNECT115200/V42 98
CONNECT300/V42BIS 40
CONNECT1200/V42BIS 41
CONNECT2400/V42BIS 42
CONNECT4800/V42BIS 43
CONNECT7200/V42BIS 44
CONNECT9600/V42BIS 45
CONNECT12000/V42BIS 46
CONNECT14400/V42BIS 47
CONNECT16800/V42BIS 100
CONNECT19200/V42BIS 101
CONNECT21600/V42BIS 102
CONNECT24000/V42BIS 103
CONNECT26400/V42BIS 104
CONNECT28800/V42BIS 105
CONNECT38400/V42BIS 106
CONNECT57600/V42BIS 107
CONNECT115200/V42BIS 108

15
Section Six - Troubleshooting
Thissectiondescribessome of the common problems
youmayencounterwhileusingyour modem. If you can not
resolveyourdifficultyafterreadingthischapter,contactyour
dealer or vendor for assistance.
Modem does not respond to commands.
1. Make sure the modem is not configured with a conflicting
COM port and IRQ setting (see Section 2.4). Your modem
cannotbeconfiguredasCOM1(default)ifanotherdevicein
your system is also configured as COM1. Similarly, IRQ
settingsmaynotoverlap.
2. Make sure the communication software is configured to
“talk”tothemodemonthecorrectCOMportandIRQsetting
(same COM port and IRQ setting as the modem). Your
communication software must know which address your
modem is using in the system in order to pass data to it.
Similarly,IRQsettingsmustbesetcorrectlytoreceivedata
fromthemodem.
3. Make sure that your modem is initialized correctly. Your
modem may have been initialized to not display responses.
You may factory-reset the modem by issuing AT&F and
press ENTER.The factory default allows the modem to
displayresponsesafteracommandhasbeenexecuted.
4. Make sure the baud rate setting in your software is set to
115200, 57600, 38400, 19200, 14400, 9600, 2400, 1200,
or300bps.Anincorrectbaudratepreventsthemodemfrom
operatingproperly.
Modem does not dial.
1. Makesurethemodemisconnectedtoaworkingphoneline.
Replacethemodemwithaworkingphonetoensurethatthe
phonelineisworking.
2. Make sure the phone line is connected to the jack marked
“LINE.” Incorrect connection prevents the modem from
operatingproperly.RefertoSection2.2formodemconnec-
tioninstructions.
Modem dials but does not connect.
1. Make sure the IRQ setting is identical on both the modem
ANDthesoftware.Modemandsoftwaremustbeconfigured
identically.
2. Make sure the phone line is working properly. Replace the
modemwitharegularphoneanddialthenumber.Iftheline

16
sounds noisy, you may have difficulty connecting to the
remotedevice.
Modem makes a connection but no data appears
on your screen.
1. Theremotesystemmaybewaitingtoreceiveyourdatabefore
itbegins.Try pressingtheENTERkeya few times.
2. Make sure the correct data format (data bits, stop bits, and
paritybits)and flow control(RTS/CTS)arebeing used.
3. Makesurethecorrectterminalemulationmodeisbeingused
(seecommunicationsoftwaremanual).
4. MakesurethemodemisnotsharinganIRQorCOMportwith
anotherdevice(seeSection2.4).
V.42bis/V.42/MNP2-5 does not work
2. You must enable the hardware flow control (RTS/CTS)
optioninyourcommunicationsoftware.
3. Make sure your DTE speed is set at 38400 or 57600 bps.
4. UseastreamingfiletransferprotocolsuchasZmodemorY-
Modem-G.
High pitch tone is heard whenever you answer the
phone.
1. MakesureAuto-Answeristurnedoff.Yourmodemisfactory
configuredtoNOTauto-answer.IssueAT&Ftofactoryreset
yourmodem.
Modem experiences errors while communicating
with a remote modem.
1. MakesuretheDTEspeedisthesameasthemodemconnec-
tionspeedwheninDirectMode.
2. Makesuretheremotesystemandyourmodemusethesame
communicationparameters(speed,parity,etc.).
3. Make sure RTS/CTS hardware flow control is enabled and
XON/XOFFsoftwareflowcontrolisdisabledinthecommu-
nicationsoftware.
4. Make sure the data speed is not faster than your computer's
capability.MostIBMcompatiblesarecapableof19,200bps
underDOSandWindows.Operatingathigherspeedsunder
Windowsrequires afaster CPU(386/486 or better).
Modem experiences bursts of errors or suddenly
disconnects while communicating with a remote
modem.
1. Make sure Call Waiting is turned off.
2. Makesurethephonelinedoesnotexhibitexcessnoise.

17
Section Seven - Specifications
CommunicationStd. V.34,V.FC,V.32bis,V.32,V.29,V.27ter,
V.22bis,V.23,V.22,V.21,V.17,Bell212/
103
DataCompression: V.42bis/MNP5
ErrorCorrection: V.42/MNP2-4
HostInterface: 8 bit PC bus
COMports: 1, 2, 3, 4
IRQlines: 2, 3, 4, 5
FAXGroup: GroupIIISend/ReceiveStandard
FAXCommandset: EIA/TIA-578 Service Class 1, EIA/TIA-
SP2388 Service Class 2
Transmitlevel: -12 dBm +/- 1 dB
ReceiverSensitivity: -43 dBm
UART: 16550compatible
Dataformat: 300-115200 bps
Power: 2.5 W
Temperature: 0 to 55 degrees C (Operating)
Section Eight - Support and Service
In the unlikely event you experience difficulty in the use of this
product,wesuggestyou:(1)consulttheTroubleshootingsection
ofthisguideand(2)consultwithyourdealer.Toobtainservicefor
thisproduct,followtheReturnMerchandiseAuthorizationProce-
dure as outlined in the Warranty card.
Section Nine - FCC , DOC & Other Notices
9.1 FCC Compliance
ThisequipmentcomplieswithPart68oftheFCCRules.Onthis
equipmentisalabelthatcontains,amongotherinformation,the
FCCregistrationnumberandRingerEquivalenceNumber(REN)
forthisequipment.Youmust,uponrequest,providethisinforma-
tiontoyourtelephonecompany.
If your telephone equipment causes harm to the telephone net-
work, the Telephone Company may discontinue your service
temporarily. If possible, they will notify in advance. But, if
advance notice isn’t practical, you will be notified as soon as
possible. You will be informed of your right to file a complaint
withtheFCC.
Your telephone company may make changes in its facilities,
equipment, operations, or procedures that could affect proper

18
operation of your equipment. If they do, you will be notified in
advance to give you an opportunity to maintain uninterrupted
telephoneservice.
TheFCCprohibitsthisequipmenttobeconnectedtopartylinesor
coin-telephoneservice.
In the event that this equipment should fail to operate properly,
disconnecttheequipmentfromthephonelinetodetermineifitis
causingtheproblem.Iftheproblemiswiththeequipment,discon-
tinueuse and contactyourdealer orvendor.
TheFCCalsorequiresthe transmitter ofaFAXtransmissionbe
properlyidentified(perFCCRulesPart68,Sec.68.381(c)(3)).
9.2 FCC Class B Statement
This equipment has been tested and found to comply with the
limitsforaClassBdigitaldevice,pursuanttoPart15oftheFCC
Rules.Theselimitsaredesignedtoprovidereasonableprotection
against harmful interference in a residential installation. This
equipmentgenerates,usesandcanradiateradiofrequencyenergy,
andifnotinstalledandusedinaccordancewiththeinstructions,
maycauseharmfulinterferencetoradiocommunications.How-
ever, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful
interferencetoradioortelevisionreception,whichcanbedeter-
minedbyturningtheequipmentoffandon,theuserisencouraged
totryto correcttheinterferenceby one ormoreof the following
measures:
• Reorientorrelocatethereceivingantenna
• Increasetheseparationbetweentheequipmentandthereceiver
• Connecttheequipmentintoanoutletonacircuitdifferentfrom
thattowhichthereceiverisconnected
• Consultthedealeroranexperiencedradio/TVtechnicianfor
help
Notice: 1)Shieldedcables,ifany,mustbeusedinordertocomply
with the emission limits. 2) Any change or modification not
expresslyapprovedbytheGranteeoftheequipmentauthorization
couldvoidtheuser’sauthoritytooperatetheequipment.
9.3 DOC Compliance Information
NOTICE:TheCanadianDepartmentofCommunicationslabel
identifies certified equipment. This certification means that the
equipmentmeetscertaintelecommunicationsnetworkprotective,
operational and safety requirements. The Department does not
guaranteetheequipmentwilloperatetotheuser’ssatisfaction.

19
Beforeinstallingthisequipment,usersensurethatitispermissible
tobeconnected tothefacilitiesof the localtelecommunications
company.Theequipmentmustalsobeinstalledusinganaccept-
able method of connection. The customer should be aware that
compliancewiththeaboveconditionsmaynotpreventdegrada-
tionofserviceinsomesituations.
Repairstocertifiedequipmentshouldbemadebyanauthorized
Canadian maintenance facility designated by the supplier. Any
repairs or alterations made by the user to this equipment, or
equipmentmalfunctions,maygivethetelecommunicationscom-
panycausetorequesttheusertodisconnecttheequipment.
Users should ensure for their own protection that the electrical
ground connections of the power utility, telephone lines and
internal metallic water pipe system, if present, are connected
together.This precautionmay beparticularly important in rural
areas.
Caution: Users should not attempt to make such connections
themselves,butshouldcontacttheappropriateelectricinspection
authority,orelectrician,asappropriate.
NOTICE: The Load Number (LN) assigned to each terminal
devicedenotesthepercentageofthetotalloadtobeconnectedto
atelephoneloopwhichisusedbythedevice,topreventoverload-
ing.Theterminationonaloopmayconsistofanycombinationof
devicessubjectonlytotherequirement that thesumoftheLoad
Numbersofallthedevicesdoesnotexceed100.
9.4 Disclaimer, Copyright, And Other Notices
Theinformationcontainedinthismanualhasbeenvalidatedatthe
timeofthismanual'sproduction.Themanufacturerreservesthe
right to make any changes and improvements in the product
describedin this manualat anytime and without notice. Conse-
quently the manufacturer assumes no liability for damages in-
curreddirectlyorindirectlyfromerrors,omissionsordiscrepan-
ciesbetweentheproductandthemanual.
All registered trademarks are the property of their respective
owners.
Copyright © 1995 All rights reserved. No reproduction of this
documentinanyformispermittedwithoutpriorwrittenauthori-
zationfromtheManufacturer.
FirstEdition GZ/DR-Version 1.0
This manual suits for next models
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