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U-90E

Data/Fax

Modem

Troubleshooting

15-1

Chapter 15

Troubleshooting

Your modem is designed to provide years of ultra high speed satisfaction. In the unlikely
event of you encountering problems using your modem, the tips in this section will help
you to identify and resolve them. Most modem problems are a result of incorrect cabling
or settings within your communications or fax software. This section provides a list of
more common problems that you may encounter, followed by likely solutions.

15.1 AT Command Set Problems

Problem

Your modem does not respond to

AT

commands.

Solutions

1. Make sure the DTR LED is ON. If it is OFF, make sure your communications

software is using the same COM port as your modem.

2. Check to see that your modem’s COM port is not already assigned to another

installed serial device, such as a mouse or laser printer.

Problem

Your modem fails to execute

AT

commands.

Solutions

1. Make sure the DTR LED is ON. If it is OFF, make sure your communications

software is using the same COM port as your modem.

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Summary of Contents for U-90E

Page 1: ...U 90 E User s Guide Version 1 0 ZyXEL TOTAL INTERNET ACCESS SOLUTION...

Page 2: ...Disclaimer ZyXEL does not assume any liability arising out of the application or use of any products or software described herein Neither does it convey any license under its patent rights nor the pat...

Page 3: ...tructions may cause harmful interference to radio communications If this equipment does cause harmful interference to radio television reception which can be determined by turning the equipment off an...

Page 4: ...bove conditions may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any re...

Page 5: ...imation of the laws of the member states relation to Electro Magnetic Compatibility EMC Directive 2 Council Directive 91 263 EEC of 29 April 1991 on the approximation of the laws of the Member States...

Page 6: ...is warranty is the exclusive remedy of the purchaser This warranty is in lieu of all other warranties express or implied including any implied warranty of merchantability or fitness for a particular u...

Page 7: ...ail Sales sales zyxel com tw sales zyxel com sales zyxel dk Web Site www zyxel com www zyxel com www zyxel dk Phone 886 3 5783942 Ext 266 1 714 632 0882 800 255 4101 45 3955 0700 Fax 886 3 5782439 1 7...

Page 8: ...ent Features 1 2 1 4 Data Compatibility 1 3 1 5 Fax Compatibility 1 4 1 6 Technical Specifications 1 5 1 7 Applications 1 5 1 7 1 Data Transfer Via Leased Line 1 5 1 7 2 Synchronous mode DTE 1 6 1 7 3...

Page 9: ...4 1 4 2 Dialing and Answering Techniques 4 3 4 2 1 Dialing using the ATD Command 4 3 4 2 2 Auto Answer and Hook Controls 4 4 4 3 Quick Tips when issuing AT Commands 4 4 4 3 1 Modem Result Codes 4 6 4...

Page 10: ...T Command Set Summary 5 1 5 1 Basic AT Command Set 5 1 5 1 1 Result Code Options 5 4 5 2 Extended AT Command Set 5 7 5 3 Extended AT Command Set 5 13 5 4 Extended AT Command Set 5 16 5 5 AT Fax Comman...

Page 11: ...8 2 Clock Options 8 2 8 3 Half Duplex operation 8 2 8 3 1 Pseudo CD 8 3 8 3 2 V 13 8 3 Chapter 9 9 1 Error Control and Data Compression 9 1 9 1 Error Control 9 1 9 2 Data Compression 9 2 9 3 Flow Con...

Page 12: ...on 11 1 11 1 Fax Basics 11 1 11 2 Modem as Fax Machine 11 2 11 2 1 ITU T T 30 Fax Protocol 11 2 11 3 Fax Command sets 11 3 11 3 1 Defining the Fax Command Sets 11 3 11 3 2 Service Class 1 Commands 11...

Page 13: ...tatus Report ATI2 13 4 Indicator Lights 13 7 13 4 1 Retransmission Indicator 13 7 13 4 2 Dialing Indicator 13 7 13 4 3 Handshaking And Retrain Indicator 13 7 Chapter 14 14 1 Upgrading Your Modem 14 1...

Page 14: ...U 90E Data Fax Modem xiv Appendix B J EIA 232D Interface J Appendix C K Phone Jack Pin Assignments K Index M...

Page 15: ...4 Figure 3 1 Select Network Component Type 3 1 Figure 3 2 Select Network Protocol 3 2 Figure 3 3 Network 3 3 Figure 3 4 IP Address 3 3 Figure 3 5 DNS Configuration 3 4 Figure 3 6 Make New Connection...

Page 16: ...ting Commands 4 9 Table 4 6 Default Settings 4 10 Table 5 1 Basic AT Command Set 5 1 Table 5 2 Result Code Options 5 4 Table 5 3 Extended AT Command Set 5 7 Table 5 4 Extended AT Command Set 5 13 Tabl...

Page 17: ...5 EDR Settings 10 10 Table 10 6 V 25 Command Set 10 13 Table 11 1 Service Class 1 Commands 11 3 Table 11 2 MOD Parameters 11 4 Table 11 3 Service Class 2 0 Commands 11 5 Table 11 4 Status Report Resu...

Page 18: ......

Page 19: ...apters 1 4 gives a basic overview of your modem s features explains its installation procedures and introduces you to the basic commands and techniques involved in modem operation Settings and Command...

Page 20: ...re addressed Warranty Registration Card and place it in the mail Registered owners will receive future product information and update announcements Warranty registration is not necessary for product r...

Page 21: ...us transmission mode can support up to 33 6kbps For Internet access application it operates with downstream maximum speed of up to 56Kbps and upstream speed of up to 33 6Kbps The speed depends on the...

Page 22: ...one line to handle both types of calls Asynchronous and synchronous modes for reliable serial data communication Up to 33 6 Kbps for synchronous transmission Fast retrain with automatic fall forward a...

Page 23: ...educed voice function Supports DTMF tone generation and detection only 1 4 Data Compatibility The U 90E modem is a high performance universal modem capable of transmission speed up to 56 33 6 Kbps ful...

Page 24: ...300 FSK BELL 103 300 300 FSK 1 5 Fax Compatibility The U 90E modem supports fax applications and is compatible with many fax transmission standards It provides the highest fax speed of up to 14400 bps...

Page 25: ...back with self test Dialing type tone pulse dialing Line interface 2 wire dial up or 2 wire leased line Call progress monitoring dial tone busy and ring back detection Audio Monitor programmable volum...

Page 26: ...de DTE like IBM mainframes To process large amount of information you can use the U 90E to transmit data to remote synchronous DTEs with speed of up to 33 6Kbps For more information please read the ch...

Page 27: ...232 cable Make sure your installation site is clean and well ventilated The ventilation slot of your ZyXEL modem located on the sides and bottom should not be covered to allow for free movement of air...

Page 28: ...indicates that it is ready to begin communication and lights OFF when DTE is not ready to transmit data DSR DTE mode Data Set Ready Indicator lights ON when the modem is ready for communication and l...

Page 29: ...tion if the modem is made to go off hook manually Or else the ATD or ATA command will automatically determine the mode D V Switches the modem into data mode or voice mode the telephone is connected to...

Page 30: ...Power Jack Input terminal for power adapter Line Dial up line RJ 11 terminal jack for connection to a 2 wire dial up or 2 wire leased line Phone RJ 11 terminal jack for connection to a telephone set P...

Page 31: ...dem Connect the power plug from the adapter to the power jack and plug the other end into an electrical outlet When you connect your modem to the power line make sure you only use the power adapter th...

Page 32: ...re also conveniently stored in user selectable non volatile memories and can be recalled as often as needed by using ATZn command 2 6 Power On Once your modem s power switch is turned ON a series of d...

Page 33: ...gure the TCP IP and then create a PPP connection 3 1 Installing TCP IP If TCP IP is already installed in your computer you may go to the next section about configuring the TCP IP if not from Start sel...

Page 34: ...gure 3 2 Select Network Protocol Select Microsoft and TCP IP then click on OK 3 2 Configuring TCP IP If your TCP IP is already configured you may go to the next section to setup a PPP connection if no...

Page 35: ...gure 3 4 IP Address In most cases you have to select Obtain an IP address If you have an assigned IP address from your ISP select Specify an IP address then enter your IP address and subnet mask Then...

Page 36: ...ion 3 3 Creating a Dial up Connection At this point you are only one step away from accessing the Internet Follow the instructions below to create a new dial up connection Click on My Computer on your...

Page 37: ...tion 3 5 Figure 3 6 Make New Connection Give a name to this Dial up Connection For example U 90E Then select your new modem as the device to connect to Internet and then click Next You will see the fo...

Page 38: ...odem Installation 3 6 Enter your ISP s phone number and then click Next Figure 3 8 Completing Dial Up Connection Click Finish Now you have completed dial up setup From now on you can access the Intern...

Page 39: ...fic form for your modem to recognize them A command statement always begins with the letters AT or at One or more commands and the Enter key then follow it AT commands can only be issued when your mod...

Page 40: ...For this test purpose do not enter a phone number simply choose the COM port your modem is connected to from the Connect Using list Click OK when finished The next window sets the COM port settings Th...

Page 41: ...n what communications software you use to make modem connections you may not have as much control of how the modem dials the telephone number This section shows some useful examples of the AT commands...

Page 42: ...55 that corresponds to the number of rings after which your modem answers an incoming call Disabling Auto Answer ATS0 0 Manually Answering a Call ATA Take modem off hook ATH1 Hang up modem on hook ATH...

Page 43: ...ith a Result Code Your modem supports both verbose result codes and numerical result codes i e 0 You can use the ATV command to set it one way or the other as follows Table 4 2 AT Result Codes Command...

Page 44: ...mmand set by using the on line help commands AT for Basic AT command set AT for AT command set and AT for AT command set For more information on AT commands refer to chapter AT Command Set Summaries 4...

Page 45: ...command to your modem you are actually changing the value of an S register You can use the Sr command to view the value of S register r For example to view the value of S register S0 which controls a...

Page 46: ...mation about storing phone numbers and saving default settings in the power on profile 4 4 1 Storing Phone Numbers The AT command to store a phone number is in the format AT Zs n The s is a number fro...

Page 47: ...ollowing table lists the syntax for the commands involved in storing recalling and viewing profile settings Table 4 5 Profile Setting Commands Command Description AT Vn Views the settings in profile n...

Page 48: ...may be lost at the serial port This is due to the fact that disk access interrupts have a higher priority than serial port interrupts If you are running at a high serial speed e g 230 4Kbps or 460 8Kb...

Page 49: ...rt on all other Macintosh models is a Mini 8 4 6 3 Mac Software Tips All terminal programs that make use of the hardware handshaking feature can be used on the Apple Macintosh Such programs are readil...

Page 50: ...ld be a hardware handshaking type Please refer to Appendix for a complete list of signals provided for the modem s serial port 4 7 2 Basic Modem Settings for UNIX Unix environments usually don t like...

Page 51: ...except in the case of A A and as mentioned earlier see Table 3 3 Up to 40 commands can be entered in a command line with a single AT prefix Be sure to either use all capital letters AT or all small le...

Page 52: ...proceeding R Reverse handshake go on line in Answer mode S17 5 W Wait for second dial tone Remaining digits will be dialed as in band DTMF DL Repeat last ATD command DSn n 0 3 Dial number stored in no...

Page 53: ...lways OFF M1 Speaker ON until call is answered M2 Speaker always ON M3 Speaker ON after the last digit is dialed out and OFF when carrier is detected Nn n 0 7 5 Ring volume control N0 will disable the...

Page 54: ...n 0 4 Reset modem and set power on profile S15 5 7 Zn Reset modem and load user profile n 0 3 Z4 Reset modem and load factory settings Basic command summary help 5 1 1 Result Code Options The result c...

Page 55: ...9 RINGING 10 CONNECT 2400 11 CONNECT 4800 12 CONNECT 9600 14 CONNECT 19200 15 CONNECT 7200 16 CONNECT 12000 17 CONNECT 14400 18 CONNECT 16800 19 CONNECT 38400 20 CONNECT 57600 21 CONNECT 76800 22 CONN...

Page 56: ...ONNECT 28800 40 CONNECT 26400 41 CONNECT 24000 100 CONNECT 56000 101 CONNECT 54666 102 CONNECT 53333 103 CONNECT 52000 104 CONNECT 50600 105 CONNECT 49333 106 CONNECT 48000 107 CONNECT 46000 108 CONNE...

Page 57: ...T DTE Speed Protocol Rx Rate Error control level X6 CONNECT Rx Rate ARQ X7 CONNECT Rx Rate ARQ Error control level ARQ denotes that Automatic Retransmission reQuest type of error control is enabled 5...

Page 58: ...hang up D3 Same as D2 but DTR OFF causes the modem to hang up and reset from profile 0 F Load factory settings to RAM as active configuration Gn Guard tone options S28 4 5 G0 No guard tone within USA...

Page 59: ...k mode options DCE DCE See also S43 7 S48 1 S19 N0 Multi Auto auto negotiate highest possible link rate V 34 V 32bis V 32 V 22bis V 22 and Bell 212A G3 Fax V 17 V 29 V 27ter N3 V 32 9600T 9600 7200T 4...

Page 60: ...1600 N66 V 34 19200 N67 V 34 16800 N68 V 34 14400 N69 V 34 12000 N70 V 34 9600 N71 V 34 7200 N72 V 34 4800 N73 V 34 2400 N78 V 90 56000 N79 V 90 54666 N80 V 90 53333 N81 V 90 52000 N82 V 90 50666 N83...

Page 61: ...TS tracks RTS response delay is set in S26 R1 Ignore RTS assumes RTS always ON Sn Data Set Ready DSR function selection S21 3 S0 DSR overridden DSR always ON S1 DSR according to CCITT ITU TSS See also...

Page 62: ...S14 4 5 X0 Modem provides synchronous transmit clock signal Internal clock to pin 15 of EIA 232D X1 Terminal provides synchronous transmit clock signal External clock from pin 24 of EIA 232D X2 Recei...

Page 63: ...t character length C3 8 bit character length Dn n 0 49 Set default dial pointer at telephone directory location n S29 D0 See also S35 4 and S38 0 En Modem error control negotiation S21 0 E0 if error c...

Page 64: ...will search the password table to check the remote modem s password If they match the modem will keep the connection otherwise the modem will hang up If call back security is enabled the modem will c...

Page 65: ...al quality is poor See also S41 2 Q2 Adaptive rate automatic fall back or forward Q3 Disconnect if signal quality is poor T Recall the last CND Caller ID information S40 2 V View password table Note V...

Page 66: ...tions Function Description Ref En Modem status in escape state E0 Disable the report of modem status in escape state E1 Enable the report of modem status in escape state 5 5 AT Fax Command Set For AT...

Page 67: ...bits are reserved for factory use and should not be changed 6 1 1 Basic S Registers ATSn x NOTE The default values of S Registers may change in different countries Table 6 1 Basic S Registers Command...

Page 68: ...in tenths of a second of remote carrier signal before recognition Ignored if in non FSK or half duplex operation 006 S10 Set duration in tenths of a second modem waits after loss of carrier before han...

Page 69: ...k slave mode X2 7 6 0 0 Asynchronous data with buffering Default M0 64 40 Asynchronous command synchronous data M1 128 80 Direct asynchronous no data buffering M2 192 C0 Synchronous M3 S15 bit dec Hex...

Page 70: ...Local Digital Loop back test in process T3 6 6 Remote Digital Loop back test in process T6 7 7 Remote Digital Loop back with self test in process T7 8 8 Analog Loop back with self test in progress T8...

Page 71: ...ud rate value settings n the same as S20 S19 dec Hex Modem connection mode same 000 Nn 0 73 0 49 Setting value as AT Nn command S20 dec Hex DTE speed bps Auto detected from AT Command 001 0 0 230400 b...

Page 72: ...pported by auto speed detection S21 bit dec Hex Bit mapped register 178 0 0 0 Maintain non error control connection when modem error control handshake fails E0 1 1 Drop connection when modem error con...

Page 73: ...dial of the default number D1 128 80 108 2 Data Terminal Ready DTR OFF causes the modem to hang up and return to command state default D2 192 C0 108 2 RST DTR OFF causes the modem to hang up and reset...

Page 74: ...sult code see also S40 1 Q1 S24 bit dec Hex Bit mapped register 067 6 4 16 112 10 70 Speaker volume control increments of 32 in decimal value L0 7 S25 0 255 0 FF Specify the time delay that DTR signal...

Page 75: ...128 80 Adaptive rate auto fall back forward when signal quality changes Defaults Q2 S41 2 192 C0 Disconnect when signal quality is poor Q3 S28 bit dec Hex Bit mapped register 068 0 0 0 Single line RJ...

Page 76: ...value of the XOFF 019 S35 bit dec hex Bit mapped register 32 1 2 2 Disable aborting from terminal during modem handshaking 3 8 8 Add 16dB attenuation to the leased line transmission power 4 16 10 When...

Page 77: ...Enable type 1 security with password check ZyXEL to ZyXEL only G1 64 40 Enable type 1 security with password check and call back ZyXEL to ZyXEL only G2 96 60 Enable type 2 security with password chec...

Page 78: ...S40 bit dec Hex Bit mapped register 000 1 2 2 No result code is displayed in answer mode Q2 2 4 Enables caller ID detection 3 8 Enables type 1 ring detection 4 16 Enables type 2 ring detection 5 32 E...

Page 79: ...INGING result code Xn 7 128 80 DCD forced on but pulse off for 0 5 seconds at carrier loss C0 S43 bit dec hex Bit mapped register 008 6 64 40 Enable 1 5 sec pause between off hook and modem answering...

Page 80: ...el speed Originate mode modem speed Send Receive 1200 75 Answer mode modem speed Send Receive 75 1200 N12 4 16 10 Work with D1 command DTR ON will have the modem dial the default number and DTR OFF wi...

Page 81: ...one S52 bit dec hex Bit mapped register 000 7 0 0 Select Mark as the first signal of the V 23 handshaking sequence Default N12 128 80 Select Space as the first signal of the V 23 handshaking sequence...

Page 82: ......

Page 83: ...Leased Line The leased line jack of U 90E is the same as dial up line You can connect leased line to the dial up line jack The leased line phone jack pin assignments are shown in the Appendix 7 1 1 Li...

Page 84: ...for rings does not occur in this situation If these two modems want to establish a data link one must be designated as the originator and the other as the answer You can set this manually or automatic...

Page 85: ...AT M1 When operating over a leased line modem will start handshaking in answer mode 7 3 Terminating a Leased Line Connection Disconnecting the leased line manually will only force your modem to drop...

Page 86: ......

Page 87: ...ous mode applies to the entire non FSK mode except V 90 supplied with the modem 8 1 Mode options For synchronous data communication there are two options you can choose from to define how the modem sh...

Page 88: ...ed clock signal from the received carrier serves as the transmission clock Table 8 2 Clock Options AT Command Description AT X0 Modem provides synchronous transmit clock signal Internal clock to pin 1...

Page 89: ...ion is often used together with RTS option set to R0 CTS track RTS Please take note that it would drop the line when CD signal is on for more than 20 second unless s12 6 is set to 1 8 3 2 V 13 Set s44...

Page 90: ......

Page 91: ...pression and flow control features 9 1 Error Control Error control keeps the modem data link error free by detecting and re transmitting erroneous data The U 90E modems support both MNP and V 42 error...

Page 92: ...l ruin the decompression process Hence MNP5 is used with MNP4 error control and V 42bis is used with V 42 error control The compression efficiency of V 42bis is generally higher than that of MNP5 In s...

Page 93: ...to signal the DTE that it cannot accept any more data Turn On the CTS to notify the DTE that it can keep sending data to the modem On the computer software side when the receiving buffer of the softwa...

Page 94: ......

Page 95: ...ial in remote modem will send its supervisor password for checking at the initial connection and the local modem will check this password against its pre stored acceptable password list In the type 2...

Page 96: ...s supervisor password is also the password sent for automatic password checking in a type 1 connection To modify the supervisor password use AT HS You will be asked for the original password and a new...

Page 97: ...t password is not entered within this time limit the line will be disconnected If the remote site is to enter the callback number it will be prompted to do so 10 2 Remote Configuration Remote configur...

Page 98: ...the remote modem reset its profile from the new profile is achieved with the command AT Wab Table 10 3 AT Wab Command a 0 3 Local user profile number a 4 Local active configuration a 5 Local factory d...

Page 99: ...em will also report the Caller ID information if asked by the command AT T There are two kinds of caller information message formats sent by the phone company One is the single message format which in...

Page 100: ...ge as it might appear on your screen RING TIME 04 28 12 30 CALLER NUMBER 7135551414 or CALLER NAME Brent Harper RING In the multiple message format if the caller s number and name are available the ri...

Page 101: ...scheme used in your country before using the Caller ID feature 10 4 Distinctive Ring Distinctive Ring is a phone service that may be offered by your phone company Check your phone company for availabi...

Page 102: ...comprises a long double short or triple short ring S register S40 bits 3 6 are used for distinctive ring control Each bit controls the answering of a particular ring type Setting a bit to 1 on enables...

Page 103: ...o through some procedure to get this call connected to the proper application Either way is not desirable Once enabled with the proper settings EDR can 1 Detect the data fax CNG tone without physicall...

Page 104: ...DR The new EDR can be used at home where multiple phones are installed in parallel Once this function is enabled the modem will go into EDR mode after the ring disappears and it will be able to detect...

Page 105: ...s 0 1 control the number of rings that the modem will answer to once the CNG or DTMF tone is detected The timing relationship between the Caller ID if enabled EDR and ring detection is as follows ring...

Page 106: ...machine message to press or any other DTMF key if he or she wants to send a fax Save the settings in a profile and reset the modem with AT WZ 10 6 On line Help Your modem provides on line help to und...

Page 107: ...om memory location n 0 n 49 PRN PRN n number Save number to address n 0 n 49 RLN RLN Requests list of all stored number DIC DIC Ignore incoming call CIC CIC Accepts incoming call CFI CFI XX Call failu...

Page 108: ......

Page 109: ...scanned The bit mapped data is encoded with data compression and is then transmitted across the phone line by an internal modem module The remote facsimile receives the data with its internal modem d...

Page 110: ...t interface connects your modem to the computer Your modem uses the same interface for both data and fax applications In fax operations the modem performs protocol handshaking and image data transfer...

Page 111: ...modem negotiation The Class 1 protocol uses the modem to transmit fax data only The complete organizational overhead for this protocol is handled by the connected computer The Class 1 command set is a...

Page 112: ...TH n Transmit HDLC Data with MOD 3 Carrier n 3 FRH n Receive HDLC Data with MOD 3 Carrier n 3 The value of MOD parameter Table 11 2 MOD Parameters Value Modulation Speed 3 V 21 ch 2 300 24 V 27 ter 24...

Page 113: ...FIP Initialize Service Class 2 0 Parameters FCLASS n Service Class Identification and Control n 0 1 2 0 8 refer to the FCLASS Class 1 command FMI Identify DCE Manufacturer ZyXEL FMM Identify DCE U 90...

Page 114: ...mal 5 ms fine st 3 10 ms st 4 20 ms normal 10 ms fine st 5 20 ms st 6 40 ms normal 20 ms fine st 7 40 ms FIS vr br wd ln df ec bf st Current Session negotiating parameters The same as above FCS vr br...

Page 115: ...reported nsr 0 Non standard frames are not reported nsr 1 Non standard frames are reported FIE n Procedure Interrupt parameter n 0 Disable n 1 Enable FPS n Page Transfer Status n 1 Received page is go...

Page 116: ...data or poll a remote device FCQ rq tq Copy Quality disable enable rq 0 Receive copy quality check is disable rq 1 Receive copy quality check is enable tq 0 Transmit copy quality check is disable tq...

Page 117: ...h ATD or ATA command will make the modem try to establish a fax connection Your modem will send a status report result code back to the DTE computer Table 11 4 Status Report Result Codes NO DIAL TONE...

Page 118: ......

Page 119: ...E modem 12 1 The voice AT command specification The following is a summary of the supported AT commands Table 12 1 Voice AT Commands Command Function Option Default Description FCLASS Voice data fax s...

Page 120: ...quency z duration in 0 1 sec x y x DTMF y duration in 0 1 sec x Default duration VTD setting VTD Default DTMF tone generation duration 0 255 50 Unit 0 01 second 12 2 Voice Shield DTE command The voice...

Page 121: ...U 90E Data Fax Modem Special Functions 12 3 DLE c Calling Tone DLE d Dial tone DLE e European Data Modem Calling Tone DLE f Bell Answer Tone DLE ETX End of stream...

Page 122: ......

Page 123: ...port Indicators The diagnostic capabilities listed above apply to several modes of operation asynchronous or synchronous error controlled or non error controlled data compression enabled or disabled d...

Page 124: ...thing is wrong by looking at the screen The screen should show the data you have sent to the modem The U 90E will have the TST LED On during the test This test can only be initiated while the modem is...

Page 125: ...ED indicator ON during the test This test can be initiated by either modem when the modems are on line 13 2 5 Remote Digital Loopback with Self test AT T7 This test generates data from the modem itsel...

Page 126: ...Block Size 0 Retrains Requested 0 Link Duration 0 Retrains Granted 0 FRN Requested 0 FRN Granted 0 FCS Errors 0 Round Trip Delay 0 Xmitter Underrun 0 Receiver Overrun 0 Last Speed Protocol TTxRate RR...

Page 127: ...em request If there were many blocks resent you may have experienced line trouble or protocol incompatibility Max Outstanding Maximum blocks sent without acknowledgment by remote modem Max Block Size...

Page 128: ...timeout DTR dropped Carrier lost 1 Carrier lost 2 Speed no match Security check EC negotiation failure Keyboard abort ATH command Inactivity FRMR received Local clear down Remote clear down V 8 answer...

Page 129: ...Dialing Indicator The HS LED will flash on and off for 1 2 second each to indicate that the modem is dialing This flash will continue after dialing until a carrier is detected The V34 LED will also fl...

Page 130: ......

Page 131: ...the XModem protocol 5 Type ATUPX 6 Press Enter and wait for the following prompt characters You have chosen XMODEM 128 bytes data with checksum protocol to update your modem Data in Flash ROM will be...

Page 132: ...to the factory for repair In the unlikely event that your modem fails to respond to AT commands after upgrading the flash EPROM 1 Turn off the modem 2 Press the D V button while turning on the modem t...

Page 133: ...list of more common problems that you may encounter followed by likely solutions 15 1 AT Command Set Problems Problem Your modem does not respond to AT commands Solutions 1 Make sure the DTR LED is O...

Page 134: ...M port than your modem Be sure both the software and your modem are addressing the same COM port 2 The E0 and Q1 commands may be in effect disabling echo and result codes To verify this in terminal mo...

Page 135: ...Use the E1 command to enable modem echo or turn on your software program s Echo or duplex feature Problem Each character you type appears twice on your computer screen Solution Both your modem and you...

Page 136: ...is ON and that the AA LED flickers with each incoming ring If the LEDs do not respond in this way refer to your ZyXEL User s Guide 4 Set D and auto answer if your modem is not connected to RS232 or D...

Page 137: ...frequent errors during data transfers Solutions 1 Re dial the call The telephone connection may be poor 2 Your modem and communications software may be configured for different flow control methods B...

Page 138: ...link status report which will include the reason for the disconnect For information on understanding this report refer to your ZyXEL User s Guide 2 You may have subscribed to Call Waiting and received...

Page 139: ...ere are variable idle times between characters AT command The commands used with an intelligent modem Every command line is started with the AT prefix ATtention To send an AT command to a modem you mu...

Page 140: ...y work with each other COM port Another name for the serial port on a PC Compression See data compression CRC Cyclic redundancy check an error checking protocol CTS RTS Control signal lines on an RS 2...

Page 141: ...DSP Digital signal processor ZyXEL modems are equipped with this these device s DSPs generate process and analyze all signals DSR Data Set Ready a control signal line of the RS 232C standard DTE Data...

Page 142: ...s system software is located in flash EPROMs Depending on the size of the EPROM s some features may or may not be available Flash Memory designed for multi purposes Flow control Method to stop and sta...

Page 143: ...ink Access Procedure for Modems a protocol which controls the handshake between two modems Layer protocol A standard of the ISO International Standards Organization which defines everything regarding...

Page 144: ...k to which a telephone set may be connected Processing unit A computer s brain Here all the necessary calculations are performed Protocol file transfer Many protocols have been developed to ensure rel...

Page 145: ...od he must pay the requested fees This method depends heavily on the honesty of the user Signal to noise ratio A measure for the signal quality of a connection SILENCE Status detected in voice mode If...

Page 146: ...less bits basically an abbreviation Transfer mode Data can be transferred either synchronouosly or asynchronously Transfer rate The speed at which the data bits are effectively transferred UART Univer...

Page 147: ...U 90E Data Fax Modem Glossary I ZModem A file transfer protocol with variable block size reinitiation of aborted transfers and transfer of several files in one transfer along with file and path names...

Page 148: ...5 CA Request To Send RTS 5 106 CB Clear To Send CTS 6 107 CC Data Set Ready DSR 7 102 AB Signal Ground GND 8 109 CF Data Carrier Detected DCD 15 114 DB Transmit Clock Signal source DCE 17 115 DD Synch...

Page 149: ...x C Phone Jack Pin Assignments The ZyXEL U 90E modem features two RJ 11 phone jacks one for 2 wire dial up and 2 wire leased line connection LINE and one for an optional connection to a telephone set...

Page 150: ......

Page 151: ...Distinctive Ring 1 2 10 6 10 7 EDR 10 8 EDR Application 10 10 Echo feature 4 4 4 11 5 2 6 7 15 2 15 3 Error Control 1 1 9 1 Factory default profile 4 8 Fax Command sets 11 2 Fax Operation Basics 11 1...

Page 152: ...4 Result codes 4 4 4 6 5 4 6 10 11 1 15 2 15 3 Saving Settings 4 8 Security 1 2 6 11 10 1 10 2 10 3 Functions 10 1 Levels 10 1 User Passwords 10 2 SMARTDRV 4 9 S register 4 6 4 7 5 3 6 1 6 15 10 7 10...

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