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Chapter 5 - Troubleshooting

MTA128ST-USB

MTA128ST-USB receives garbage characters when connected to a 3Com
Impact IQ terminal adapter

Most likely, the Impact IQ has compression turned on. The compression used by the
Impact IQ is incompatible with the compression used by the MTA128ST-USB.
Disconnect the data connection and give the Impact IQ the command AT%CO and then
establish the data connection again. The garbage characters should disappear.

MTA128ST-USB receives garbage characters after receiving several good
characters when connected to a 3Com Sonix adapter

Most likely, the Sonix has compression turned on. The compression used by the Sonix is
incompatible with the compression used by the MTA128ST-USB. Disconnect the data
connection and give the Sonix the command AT”HO (that’s a double quote) and then
establish the data connection again. The garbage characters should disappear.

Each time a 3Com Sonix terminal adapter originates a V.120 call, the
MTA128ST-USB answers the call as a V.110 call

The Sonix sends V.110 information in the SETUP message to the network. Since the
MTA128ST-USB’s default is with Auto Protocol Detection enabled (ATS52=1), it looks at
SETUP information from the Sonix and determines erroneously that it is a V.110 call.
Disable Auto Protocol Detection in the MTA128ST-USB with the command ATS52=0 and
try the connection again.

MTA128ST-USB won’t connect to an ELSA terminal adapter with the V.120
data protocol

Most likely, the ELSA terminal adapter has compression turned on. The compression
used by the ELSA terminal adapter is incompatible with compression used by the
MTA128ST-USB. Give the ELSA the command AT%CO to disable compression and try
again.

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Содержание MultiModemISDN MTA128ST-USB

Страница 1: ...Model MTA128ST USB External ISDN Terminal Adapter User Guide...

Страница 2: ...revisions or changes Record of Revisions Revision Date Description A 6 21 99 Manual released All pages at revision A Trademarks MultiModemISDN Multi Tech and the Multi Tech logo are trademarks of Mult...

Страница 3: ...lation and Configuration Introduction 18 Driver Software Installation 18 Removing Your Old Device from Windows 98 95 21 Configuration 21 Network Configuration 22 Call Control Configuration 23 ISDN MTA...

Страница 4: ...rvice 71 The Multi Tech BBS 71 Logging on to the Multi Tech BBS 71 Downloading a File 72 Reading a Message 72 Leaving a Message 72 Bulletins 72 Upgrading the MTA128ST USB with Flash Wizard 73 Using Fl...

Страница 5: ...Chapter 1 Introduction and Description...

Страница 6: ...to use the same communications software as an analog modem TD RD LS B1 B2 TR OH 128 P1 P2 USB ISDN Modem with Analog Port Figure 1 1 MTA128ST USB Front View The MTA128ST USB is compatible with the pop...

Страница 7: ...tion utility Chapter 4 AT Commands S Registers and Result Codes Describes how to use AT commands S registers and result codes to control the MTA128ST USB through popular communications programs Chapte...

Страница 8: ...S 100 switch protocols Compatibility with V 110 V 120 ML PPP and X 75 protocols ISDN BRI 2B D and analog ports USB port Type B Support of PPP Point to Point Protocol for high speed ISDN connections To...

Страница 9: ...ocol Data Rates 300 1 2K 2 4K 4 8K 9 6K 19 2K 38 4K 56K 57 6K 64K 115 2K 230 4K and 460 8K bps Data Connections Two ISDN B channels One ISDN D channel One analog port for connecting a standard telepho...

Страница 10: ...10 MultiModemISDN User Guide MTA128ST USB...

Страница 11: ...Chapter 2 Hardware Installation...

Страница 12: ...de Four USB V 90 Modems TD RD LS B1 B2 TR OH 128 P1 P2 USB ISDN Modem with Analog Port Figure 2 1 Unpacking Safety Warning Telecom ISDN ST 1 Never install telephone wiring during a lighting storm 2 Ne...

Страница 13: ...128 P1 P2 USB ISDN Modem with Analog Port Figure 2 2 Mounting the Feet Connecting the MTA128ST USB to Your System Place the MTA128ST USB terminal adapter in a convenient location In a typical configur...

Страница 14: ...ot appear to be working see Chapter 5 for troubleshooting help Caution Only use the power supply shipped with your MTA128ST USB any other power supply could damage the unit and void its warranty Conne...

Страница 15: ...ved on for a space off for a mark LS Power Lights when the unit is turned on B1 Bearer Channel 1 When lit indicates active data or voice connection on bearer channel 1 B2 Bearer Channel 2 When lit ind...

Страница 16: ...PP is in use as shown below Data Protocol 128 LED P1 LED P2 LED V 110 V 120 X 75 PPP 1 channel MLPPP 2 channels OFF ON References The World Wide Web is an excellent source of information about termina...

Страница 17: ...Chapter 3 Software Installation and Configuration...

Страница 18: ...up your Windows 98 system 2 Turn on your MTA128ST USB The LS Power LED will light 3 Plug the D shaped end Type B of your USB cable into the USB connector on the back of the unit See Figure 2 3 4 Windo...

Страница 19: ...ext 7 The Add New Hardware Wizard dialog box is displayed Windows will select the proper driver from the installation disk and will display the information for verification Click Next to install the s...

Страница 20: ...sion C offer support for USB peripherals If you are unsure if your Windows 95 system supports USB a free USB evaluation utility is available from the Shopping Bag page at http www usb org Down load th...

Страница 21: ...tiple Subscriber Numbers MSNs Configure the unit to match your ISDN service and the remote terminal adapter TA with any of three methods listed below ISDN MTA128ST USB Configuration Utility This confi...

Страница 22: ...Data MSN Multiple Subscriber Number allows a caller to specify an individual MTA128ST USB when more than one unit is connected to your network terminator If you don t assign a value to the MSN the un...

Страница 23: ...___ The data protocol also known as the B channel protocol and the rate adaption protocol is the language spoken over each 64 Kbps channel between two ISDN devices The devices on both ends of the ISDN...

Страница 24: ...and then click Control Panel 3 Double click the Add Remove Programs icon 4 In the Install Uninstall tab click Install 5 Follow the instructions that appear on screen To Use the ISDN MTA128ST USB Confi...

Страница 25: ...information on Dial Up Networking see Windows 98 95 Help AT Commands You can configure the MTA128ST USB by using AT commands just as you would configure an analog modem Use this method if you prefer...

Страница 26: ...26 MultiModemISDN User Guide MTA128ST USB...

Страница 27: ...Chapter 4 AT Commands S Registers and Result Codes...

Страница 28: ...he TA has three modes of operation off line command mode the default state on line command mode and data mode The TA responds to AT commands only when it is in one of the command modes After the TA es...

Страница 29: ...ation protocol USB Port Configuration En Command mode echo L List telephone numbers L5 List current operating parameters L6 List S register values L8 Display ISDN status Qn Status displays Sr n Set S...

Страница 30: ...d examples RETURN frequently is abbreviated cr Command AT cr Function In Band Escape Code Values ASCII Default 43 Description Makes TA enter command mode without disconnecting the call when it is on l...

Страница 31: ...witch Type Values n 0 1 2 4 5 or 6 Default C0 2 Net3 Description Use the C0 command to select one of the six network switch types supported by the TA Factory default setting is C0 2 NET3 C0 0 AT T 5ES...

Страница 32: ...escription D3 0 63 Sets TEI to a fixed value from 0 63 D3 240 Sets voice channel for dynamic TEI negotiation default D3 241 Disables TEI Command L Function Display Network Configuration Values n a Def...

Страница 33: ...unction Voice DN MSN Values n 25 character string Default null string Description Sets the DN MSN for the voice channel See the N1 command description Command RXGn Function Receive Gain Values n 0 10...

Страница 34: ...tion List Active Profile Values n 5 or 6 Default none Description Lists current operating parameters of the TA which is useful when changing communications software or changing default settings ATL5 l...

Страница 35: ...ges Description Use X to select which result code messages the TA sends to the computer X0 Enables messages OK CONNECT RING NO CARRIER and ERROR terse result codes 0 4 X1 Enables all messages except B...

Страница 36: ...lls the TA that the connected computer is ready to communicate D0 TA ignores the DTR signal D1 When DTR goes low TA exits data mode and re enters AT command mode D2 If DTR goes low when TA is on line...

Страница 37: ...ather than using separate control lines When an XOFF character is detected the data stream is suspended until an XON character is detected The drawback to this method is that some files may contain th...

Страница 38: ...numbers in the dial string like ATD5551000 5553000 the TA will dial both of those numbers J0 does not disable the dialing of a second number if a second number is given in the dial string n 0 disable...

Страница 39: ...d Zn x Function Store Telephone Number Values n 0 9 x dial string Default n a Description The Z command lets you store a telephone number in a memory register for faster dialing To store a number type...

Страница 40: ...o effect on the network rate of that call see S77 for a description for this case The value of MB will change if S76 is changed and the value of S76 will change if MB is changed Command En Function Es...

Страница 41: ...on hook hang up Since the TA goes off hook automatically when it dials the H command is normally used only to hang up To hang up first escape to command mode AT cr then type ATH or ATH0 cr You also ca...

Страница 42: ...on Start ConfigMenu Values none Default none Description The CONFIG command starts the TA s internal configuration utility used to customize the TA s configuration for your application You must enter...

Страница 43: ...cape Sequence Timeout S34 Maximum Escape Sequence Length S44 POTS Port Ring Frequency S45 Use Dial Tone from Central Office S46 Pulse Dial Recognition S49 POTS Port Dial Tone Gain S50 Caller Line ID C...

Страница 44: ...a value other than its default value of zero or if the value is increasing with rings this new value remains stored in S1 for eight seconds after the last ring is counted after which time the value re...

Страница 45: ...comma inserted in a dialing command The default setting is 2 seconds where each unit is one second S8 may be set for up to 255 seconds S Register S10 Function DCD Drop Time Unit 50 ms Range 0 254 255...

Страница 46: ...ription Makes the TA disconnect a data connection if no data is transmitted or received for the specified time It will NOT cause a POTS call voice modem fax to disconnect The timer restarts any time a...

Страница 47: ...e POTS port This makes DTMF dialing difficult since DTMF digits have to overcome the loudness of the dial tone see S49 and S51 for more information S Register S46 Function Pulse Dial Recognition Unit...

Страница 48: ...Function POTS Port Dial Tone Suppression Unit Decimal ASCII code Range n 0 1 Default 0 Description S51 only affects NET3 switch type and voice modem fax calls attempted on the POTS port Some NET3 swi...

Страница 49: ...POTS port either by a telephone modem or fax Some Central Office CO switches keep track of the type of line each customer has and if that line is labeled as a data line modem or fax it will not accept...

Страница 50: ...arty Number IE is sent S register S57 applies to NET3 C0 2 switch type only Function Called Party Number IE Settings Unit decimal ASCII code Range 128 Disable Type of Number 0 Unknown 16 International...

Страница 51: ...P DBA scheme is desired but the server does not support MP the TA falls back to the PPP DBA scheme Due to this fall back ability DBA on the client side is always possible Setting S59 2 to use PPP inst...

Страница 52: ...emand High Throughput Threshold Unit Kbps Range n 0 64 Kbps Default 52 52 Kbps Description Sets the Bandwidth on Demand High Throughput Threshold which determines whether a second channel should be ad...

Страница 53: ...device Call Bumping is available to the host TA only if MP S59 1 was negotiated by both the client and the host Also Call Bumping is not available to the host TA if the Dynamic Bandwidth Allocation sc...

Страница 54: ...ppropriate country to use the frequencies and cadences specified according to ETS 300 001 Chapter 1 1992 p 56 The Austria and France settings default the frequency to 25 Hz since the TA doesn t suppor...

Страница 55: ...r example S70 453 sets S70 to 450 ms 0 45 seconds S register S71 Function Second Idle Duration Unit 1 ms Range 5 9995 Default 2000 ms Description Sets the duration of the second idle period of the rin...

Страница 56: ...Rate Unit decimal ASCII code Range n 1 600 bps n 2 1200 bps n 3 2400 bps n 4 4800 bps n 5 9600 bps n 6 19200 bps n 7 38400 bps Default 7 38400 bps Description If S77 1 then the network rate of the V...

Страница 57: ...codes which can be displayed on your monitor or intercepted and used by your communications software Using the V command you can select whether the result codes are terse numbers or verbose words The...

Страница 58: ...ission of data is suspended To enter online command mode from data mode type the escape sequence AT cr To return to data mode from online command mode type ATO cr Making a Call Before you can place a...

Страница 59: ...ng when the user attempts to make a connection The solution is to not check the Use Country Code and Area Code box or to simply add the bundling dial modifier to the phone number at the time of connec...

Страница 60: ...he ring on which you want the TA to answer e g in terminal mode type S0 4 to make the TA answer on the fourth ring You also can use either of the configuration utilities to the turn on autoanswer and...

Страница 61: ...Chapter 5 Troubleshooting...

Страница 62: ...ossibilities before calling Tech Support see Chapter 6 None of the LEDs light when the MTA128ST USB is on When you turn on the MTA128ST USB the LED indicators on the front panel should flash briefly a...

Страница 63: ...cable may be plugged into the wrong connector check your computer documentation to make sure Or you may have selected a COM port in your software other than the one the MTA128ST USB is physically con...

Страница 64: ...s secure try replacing it If that doesn t work the problem may be in your building s telephone installation Make sure ISDN cables on all devices are wired straight through pin 1 to pin 1 pin 2 to pin...

Страница 65: ...MTA128ST USB disconnects while online Check for loose connections between the MTA128ST USB and the computer the ISDN jack and AC power The problem may have originated at the other end of the line Try...

Страница 66: ...command AT D1 1 the default setting When using X 75 data protocol to transfer data via the Zmodem the Zmodem displays Intermittent bad packet errors and data throughput drops This occurs in cases when...

Страница 67: ...n and give the Sonix the command AT HO that s a double quote and then establish the data connection again The garbage characters should disappear Each time a 3Com Sonix terminal adapter originates a V...

Страница 68: ...68 MultiModemISDN User Guide MTA128ST USB...

Страница 69: ...Chapter 6 Warranty Service and Technical Support...

Страница 70: ...IED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty does not apply to any products which have been damaged by lightning storms water or power sur...

Страница 71: ...ared to provide the serial number of the product sent Send the MTA128ST USB to Multi Tech Systems Inc 2205 Woodale Drive Mounds View Minnesota 55112 ATTN Service or Repairs The Multi Tech BBS Multi Te...

Страница 72: ...N 5 Enter D A list of the files you marked displays Enter E if you want to edit the list otherwise enter D again to start the download process 6 Select a file transfer protocol by typing the indicated...

Страница 73: ...in the directory where Flash Wizard is running the utility exits with an error 2 Launch the Flash Wizard utility e g double click on the FlashWiz exe file from Explorer enter the file name at the DOS...

Страница 74: ...Phone 800 826 0279 Fax 914 267 2420 Email info thesupplynet com Internet http www thesupplynet com SupplyNet Online Ordering Instructions 1 Browse to http www thesupplynet com In the Browse by Manufa...

Страница 75: ...Appendixes...

Страница 76: ...aged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equip...

Страница 77: ...the approximation of the laws of Member States relating to electromagnetic compatibility and Council Directive 73 23 EEC of 19 February 1973 on the harmonization of the laws of Member States relating...

Страница 78: ...tion default F1 Profile 1 V 110 async operation F2 Profile 2 V 120 async operation F3 Profile 3 X 75 async operation F4 Profile 4 ML PPP async operation Quick Setup Example The following procedure ass...

Страница 79: ...pe R1 CTS always high S0 1 Answer after 1 ring S2 43 Set escape character to ASCII 43 S3 13 Set carriage return character to CR ASCII 13 S4 10 Set line feed character to LF ASCII 10 S5 8 Set backspace...

Страница 80: ...1 CTS always high S0 1 Answer after 1 ring S2 43 Set escape character to ASCII 43 S3 13 Set carriage return character to CR ASCII 13 S4 10 Set line feed character to LF ASCII 10 S5 8 Set backspace cha...

Страница 81: ...ape R1 CTS always high S0 1 Answer after 1 ring S2 43 Set escape character to ASCII 43 S3 13 Set carriage return character to CR ASCII 13 S4 10 Set line feed character to LF ASCII 10 S5 8 Set backspac...

Страница 82: ...1 CTS always high S0 1 Answer after 1 ring S2 43 Set escape character to ASCII 43 S3 13 Set carriage return character to CR ASCII 13 S4 10 Set line feed character to LF ASCII 10 S5 8 Set backspace cha...

Страница 83: ...ons normally D0 Disable persistent DTR dialing D1 Hang up when DTR drops E1 Enable command mode echo E4 Enable hardware flow control E6 Discard XON XOFF characters E13 Enable pacing X0 Disable Sending...

Страница 84: ...84 MTA128ST USB User Guide MTA128ST USB...

Страница 85: ...Glossary...

Страница 86: ...ndwidth is a factor in determining the amount of information and the speed at which a medium can transmit data or other information basic access A term that describes a simple standardized combination...

Страница 87: ...acket Switched Networks have another level of DCE that is most often located at a central office D channel A non ransparent digital ISDN channel that operates at 16 K or 64 Kbps used for call control...

Страница 88: ...ycles Frequency is inversely proportional to the wavelength or pulse width of the signal e g long wavelength signals have low frequencies and short wavelength signals yield high frequencies function A...

Страница 89: ...pter when more than one unit is connected to your network terminator An MSN consists of a base address and a subaddress If you assisgn a base address only the unit accepts any incoming call with the s...

Страница 90: ...channel identification contrast logical channel or virtual channel PDN public data network A packet switched network that is available to the public for individual subscriber use Typically controlled...

Страница 91: ...o the telephone network These wires provide ISDN service but also require an NT1 at the enduser location as well as the LT at the network end See also local loop supplementary services SS ISDN functio...

Страница 92: ...e A and B types Upstream connections computer hub input etc are made using the A type connector downstream connections peripherals hub outputs are made using the B type connector The USB spec defines...

Страница 93: ...f information pages from a central resource See also ISDN virtual circuit A logical connection Used in packet switching wherin a logical connection is established between two devices at the start of t...

Страница 94: ...94 MultiModemISDN User Guide MTA128ST USB...

Страница 95: ...system 71 Break signal 30 C Cables ISDN 64 USB serial 63 Call control configuration 23 Auto answer data calls 23 Data protocol 23 Dialing method 23 Dialing number 23 Dialing stored numbers 23 Persiste...

Страница 96: ...100 switch type 31 DN directory number 22 33 Driver software installation Windows 95 20 Windows 98 18 DSR Data Set Ready signal 38 DSR Control AT command 38 DTR Data Terminal Ready 23 Dialing 39 Drop...

Страница 97: ...Rate adaption protocol AT command 34 Reference materials 16 Regulatory compliance 76 93 77 Remote node operation 21 25 Removing a modem from Windows 21 Result codes 64 Connect messages command 35 Ena...

Страница 98: ...er with the V 120 67 U Uninstalling an MTA128ST USB from Windows 21 Unpacking the MTA128ST USB 12 Upgrade firmware FlashWizard 73 USB evaluation utility 20 USB overview 6 V V 110 protocol 23 78 V 120...

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