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Diagnostics & Troubleshooting 107

9

Diagnostics &
Troubleshooting

Diagnostics

The U-336E is equipped with several diagnostic capabilities:

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Power-on Self Test.

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Analog Loop-back Test.

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Analog Loop-back with Self-Test.

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Local Digital Loop-back Test.

•

Remote Digital Loop-back Test.

•

Remote Digital Loop-back with Self-Test.

The diagnostic tests listed above apply to several modes of
operation: asynchronous or synchronous, error controlled or non-
error controlled, data compression enabled or disabled data mode.
You can use these capabilities to verify the line condition and the
modem's functioning and performance, and to locate the source of a
communication problem.

Power-On Self Test

At each power-up or upon a reset command from the panel, the
modem will test the ROM code checksum, system RAM memory,

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Summary of Contents for U-336E

Page 1: ...U 336E User s Manual Version 1 0 Mar 1997 ZyXEL ACCESSING INTERNET INTRANET ...

Page 2: ...nt as provided under this 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 use or purpose ZyXEL shall in no event be held liable for indirect or consequential damages of any kind or character to the purchaser To obtain the services of this warranty plea...

Page 3: ...ed herein without notice This document is subject to change without notice Acknowledgments Trademarks mentioned in this manual are used for informational purposes only Trademarks are properties of their respective owners FCC Part 15 Information This device complies with Part 15 of FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This...

Page 4: ...fications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment Shielded RS 232 cables are required to be used to ensure compliance with FCC Part 15 and it is the responsibility of the user to provide and use shielded RS 232 cables Information for Canadian Users The Industry Canada label identifies certified equipment This certifica...

Page 5: ...that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas Caution Users should not attempt to make such connections themselves but should contact the appropriate electrical inspection authority or electrician as appropriate This digital apparatus ...

Page 6: ...amending directive on the approximation of the laws of the member states relating to EletoMagnetic Compatibility Contacting ZyXEL If you have questions about your ZyXEL product or desire assistance contact ZyXEL Communications Corporation in one of the following ways Phone In North America call between 8 00 AM and 5 00 PM PST at 714 693 0808 Outside North America you can dial 886 3 5783942 EXT 252...

Page 7: ...d at this FTP address ftp zyxel com For European versions and related files use the address ftp zyxel co at Postal Service You can send written communications at the following address ZyXEL Communications Corporation 6 Innovation Road II Science Based Industrial Park Hsinchu Taiwan 300 R O C or ZyXEL Communications Inc 4920 E La Palma Avenue Anaheim CA92807 U S A ...

Page 8: ...uired Equipment 2 Becoming a Registered Owner 2 Modem Features 3 Standard Features 3 Intelligent Features 3 Fax Compatibility 4 Technical Specifications 5 2 Installation 7 Front Panel 7 Front Panel LEDs 7 Front Panel Switches 9 Rear Panel Markings 9 Modem Connection 10 Powering Up 11 3 Basic Modem Operation 13 Understanding AT Commands 13 Using the Windows 95 Hyper Terminal Program 13 ...

Page 9: ...Profiles 22 Helpful Hints for PC Computers 22 Default Modem Settings for PC s 23 ZyXEL Serial Parallel I O Card 24 Helpful Hints for Mac Computers 24 Special AT Command Settings for Mac 24 Mac Serial Port 24 Mac Software Tips 25 Helpful Hints for UNIX Based Computers 25 Serial Cable 25 Basic Modem Settings for UNIX 26 Unix Software Tips 26 4 Leased Line Operation 27 Connecting to a Leased Line 27 ...

Page 10: ...x Operation 45 Fax Basics 45 Modem as Fax Machine 46 ITU T T 30 Fax Protocol 46 Fax Command sets 47 Defining the Fax Command Sets 47 Class 1 Command Set 48 Class 2 Command Set 49 Class 2 0 Command Set 55 Extended Fax AT Command Set 62 Flow Control 66 Fax Reception from a BBS 67 7 AT Command Set Summaries 69 Basic AT Command Set 69 Description of ATI2 Output 72 Extended AT Command Set 75 Extended A...

Page 11: ...107 Power On Self Test 107 Resetting The Modem 108 Loopback Tests 109 Indicator Lights 110 Line Condition Status Display 111 Trouble Shooting 113 AT Command Set Problems 113 Command Echo Problems 115 Answer Problems 115 Dialing Problems 116 Data Transfer Problems 117 Connection Problems 117 10 Upgrading Your Modem 118 Upgrading by Flash EPROM 118 Kernel Recovery Mode 119 11 Connector Pinouts 120 P...

Page 12: ...xii 12 Index 124 ...

Page 13: ...d like more information about a topic covered in your User s Manual please call ZyXEL Technical Support at 714 693 0808 Other means of contacting ZyXEL are listed in the Contacting ZyXEL section Unpacking Your Modem Enclosed Equipment Before you proceed further please check all items you received with your modem against this list to make sure nothing is missing The complete package should include ...

Page 14: ...on on page vi Required Equipment In addition to the ZyXEL modem you just purchased you must have the following equipment to operate your modem Computer terminal Available PC serial port with a high speed 16550 UART Standard straight through RS 232 cable pins 1 8 20 22 Available telephone jack Available AC wall outlet Telephone line from your telephone company dial up or leased line Data and fax co...

Page 15: ...ures Ultra high speed modem supports V 34bis for 33 600bps and is backwards compatible Operates in all environments including Windows 95 DOS Windows Macintosh OS 2 UNIX Novell Amiga and IBM AS400 RS6000 V 42 and MNP 4 3 error correction V 42bis and MNP 5 data compression DTE serial interface with speeds up to 460 8Kbps 12 LED indicators Extended AT command set with V 25bis Operates on 2 wire dial ...

Page 16: ...lls before you answer you must subscribe to this service through your telephone company in order for your modem to identify callers Distinctive ring detects data and voice calls this feature requires communication software that supports distinctive ring such as ZFAX Remote configuration capability EDR extended Distinctive Ring Flash EPROM memory lets you easily upload new firmware providing you wi...

Page 17: ...toggle switch Configuration settings software programmable with non volatile memory for phone number profile storage Diagnostics self test analog loopback with self test digital loopback and remote digital loopback 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 programm...

Page 18: ...6 Introduction ...

Page 19: ...re 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 and should allow free movement of air Front Panel Figure 2 1 shows the front panel of the U 336E There are 10 LED indicators a 20 x 2 LCD display and four key switches Figure 2 1 Front Panel Front Panel LEDs V34 V 34 mode indicator lights up when you...

Page 20: ...ndicator lights up when the modem is ready for communication CTS DTE mode Clear To Send indicator lights up when modem can accept data for transmission It indicates the signal status of RS232 signal CTS RTS DTE mode Request To Send indicator indicates the signal status of RS232 signal RTS from DTE RTS is used for hardware flow control in asynchronous data transmission TXD Transmit indicator ON whe...

Page 21: ...e set is connected to the line Rear Panel Markings The U 336E rear panel is shown below Figure 2 2 Rear Panel The following explains the connectors and switch on the rear panel POWER Power switch turns the modem ON or OFF 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 connectio...

Page 22: ...s supplied with this unit Use of another adapter may not allow your modem to operate and could result in serious damage to the unit This adapter is rated for direct connection to an AC power outlet Connect your modem as shown in Figure 2 3 Modem Connections To Power Adapter To Telephone To Dial Up or Leased Line To DTE Computer Figure 2 3 Modem Connections There are no DIP switches or configuratio...

Page 23: ...ower switch is turned ON a series of diagnostic tests will be performed For a more detailed description of these diagnostic tests please refer to Chapter 9 Diagnostics Troubleshooting After performing the diagnostic tests your modem is ready for use ...

Page 24: ...12 Installation ...

Page 25: ...the user with the computer keyboard Command statements must be written in a specific form in order for your modem to recognize them A command statement always begins with the letters AT or at It is then followed by one or more commands and the Enter key AT commands can only be issued when your modem is in command mode or off line Once your modem has established a connection with another modem it i...

Page 26: ...l be prompted for country information area code and phone number and the device used to make the connection 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 The settings used for your modem should be as follows Bits per second 57600 Data bits 8 Parity...

Page 27: ...nect from the Call menu Dialing and Answering Techniques Depending on 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 used for dialing and answering operations The command characters specific to each function are shown in bold type Dialing using the...

Page 28: ... hook ATDT 2468 Auto Answer and Hook Controls Enabling Auto Answer ATS0 n O ONOTE IN THIS EXAMPLE N IS A NUMBER FROM 1 TO 255 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 ATH0 Manually Disconnecting a Call ATH Making Your First Connection In order to ...

Page 29: ...s when issuing AT Commands The ENTER or RETURN key must be pressed to execute a command Multiple AT commands can be combined into one line For example AT D2 and AT N0 can be combined into one line AT D2 N0 Your modem processes commands from left to right The AT command that appears to the right might over write the command to the left if they are trying to accomplish tasks or set modes that cannot...

Page 30: ... a few basic commands that do not require the AT command prefix These are as follows Command Description A Repeats the last issued AT command once A Repeats the last issued AT command once or re dials the last dialed number up to 9 times until a key is pressed or a connection is made any key Terminates the current connection attempt if pressed while modem is handshaking Escape code sequence Entere...

Page 31: ...ur modem sends a result code to let you know whether the command was executed An OK result code means the AT command you sent was executed If you receive an ERROR code it means the command was invalid The U 336E also provides result codes that show Whether or not a Dial Tone was detected when the modem originated a call If a busy signal was detected when the modem originated a call If a remote tel...

Page 32: ...S0 and press Enter The modem responds with a three digit character showing the value of this register followed by OK A value of 002 for example means your modem will auto answer incoming calls after the second ring Some S registers are bit mapped For these registers you can use the Sr b command to read their values For example to read the value of S register S35 bit 7 type ATS35 7 and press Enter ...

Page 33: ...n the format AT Zs n The s is a number from 0 to 49 that represents the location in memory that the phone number is to be stored and the n is the phone number itself Example To store the number 1 714 555 1212 in memory location 2 type AT Z2 17145551212 Enter You can store up to 50 telephone numbers Dialing Stored Phone Numbers The AT command syntax used to dial a stored number is ATDS n The n is t...

Page 34: ... Resets the current settings with the settings in profile n n 0 to 4 Profiles 0 to 3 User profiles Profile 4 Factory default profile Helpful Hints for PC Computers Most PCs are equipped with more than one serial port Standard cables are readily available from many suppliers Usually serial ports are manufactured in two forms either with a 25 pin male jack or a 9 pin male jack For high speed serial ...

Page 35: ... a high serial speed e g 230 4Kbps or 460 8Kbps on your PC be sure to enable the disk cache by including SMARTDRV execution in your AUTOEXEC batch file Default Modem Settings for PC s The U 336E factory settings are configured for operation with PC type computers and communication software In most cases no additional settings will be required The following are some of the default settings that are...

Page 36: ...byte transmission and a 32 byte receival FIFO to increase communication program efficiency Helpful Hints for Mac Computers Special AT Command Settings for Mac For operation with Mac computers you may use the factory default settings with one exception You must set the modem to ignore the DTR signal as follows Type AT D0 enter set modem to ignore DTR AT WZ enter saves the settings to power up profi...

Page 37: ...rograms using the serial ports If the modem is turned off when you start your Macintosh with the line manager activated the computer may seem to freeze for a few minutes During this time the line manager software tries to locate and to set up the modem Turn on your modem before you start your Macintosh to avoid this delay MaxFax is another fax software for Macintosh computers Drivers are available...

Page 38: ...n using AT C0 Unix Software Tips In order to use your ZyXEL modem from a terminal or an X Windows application you need a program such as Minicom or Seyon If you wish to make use of your ZyXEL modem s special features special gettys such as mgetty or vgetty are needed These programs are available from several ftp sites Some archives also contain source files You should suppress the modem s result c...

Page 39: ...e leased line must be connected to the jack labeled Line Set your modem for leased line operation by typing commands from the terminal The leased line phone jack pin assignments are shown in Chapter 11 Connector Pinouts Power Level Setting Your modem s leased line mode transmission power level can be adjusted from 0 dBm to 27 dBm in 1 dBm increments AT Command Description AT P0 AT P15 The default ...

Page 40: ... of the originating modem in and press the A O button on the front panel of the answering modem out Use AT Mn or set S14b0 to select originate or answer mode Auto Handshake If you want handshaking to occur automatically upon power up you have to save the leased line configuration to the power on profile Please remember to set the handshake mode before you save the configuration Be sure that one mo...

Page 41: ...Terminating a Leased Line Connection A leased line can be terminated two ways Going on line manually Turning the power OFF and ON If you have set the leased line as the power on default the modem will try the leased line again ...

Page 42: ...30 Leased Line Operation ...

Page 43: ...the remote modem is also a ZyXEL modem Type 2 security is used when the remote modem is any other brand The type 1 connection the dial in remote modem will send in its supervisor password for checking at the initial connection and the local modem will check this password against its pre stored acceptable password list The type 2 connection the remote terminal will be prompted to enter the password...

Page 44: ...minal mode Any access attempt will result in the modem s prompting the user to enter the supervisor password The attempt will be rejected if the entered password is not correct The default supervisor password is ZyXEL when the modem is shipped from the factory This supervisor password is also the password sent for automatic password checking in a type 1 connection To modify the supervisor password...

Page 45: ...ssword check and callback G3 Enable type 2 and level 1 security with password check G4 Enable type 2 and level 2 security with password check and callback G5 Enable type 2 and level 2 security with password check and callback remote site enters the callback number O ONOTE BEFORE THE SECURITY TYPE OR LEVEL CAN BE CHANGED THE MODEM REQUIRES THE SUPERVISOR PASSWORD For type 2 security the remote site...

Page 46: ...ctive settings back to the profile Then the connection is reestablished and the profile transmitted to the remote modem Reading a remote profile b into a local profile a is achieved with the command AT Rab a 0 3 Local user profile number b 0 3 Remote user profile number b 4 Remote active configuration b 5 Remote factory default Return the modems to on line status again The local modem can upload w...

Page 47: ...here are many remote modems and a set of standard configurations is available so you can store them into user profiles You just need to configure the remote modem into one of the standard configurations by activating the remote configuration once Caller Number Delivery Caller ID Caller Number Delivery CND commonly called Caller ID is a new kind of phone service that may be offered by your local ph...

Page 48: ...ction O ONOTE THE CALLER ID MESSAGE MAY CAUSE SOME COMMUNICATION SOFTWARE THAT IS NOT EXPECTING IT TO BECOME CONFUSED IF YOU PLAN TO USE THE CALLER ID FEATURE BE SURE YOU ARE USING SOFTWARE THAT SUPPORTS IT SUCH AS ZFAX In single message format the modem will send a ring message to the terminal as follows RING TIME MM DD hh mm CALLER NUMBER CALLER_ID or CALLER NAME CALLER_NM RING MM is the two dig...

Page 49: ...m CALLER NUMBER Caller_ID CALLER NAME Caller_Name RING Here is an example RING TIME 04 28 12 30 CALLER NUMBER 7135551414 CALLER NAME Tracy Huang RING If the caller number and name are not available the ring message will appear as follows RING TIME 04 28 12 30 REASON FOR NO NUMBER OUT_OF_AREA REASON FOR NO NAME PRIVACY RING The last CND message that the modem received can be displayed by using the ...

Page 50: ...end a different type of ring signal for each phone number being called The subscriber can distinguish which number is called by which type of ring is received One benefit of this feature is the ability to have three numbers on the same line allowing you to list the three numbers for voice data and fax respectively You can then have your fax machine answer only the ring corresponding to the fax num...

Page 51: ...ccepted ring by the modem The control relationships between bits 3 6 in register S40 and the different ring types are Type Bit on Ring Sequence 1 3 1 2s or 2s on 4s off 2 4 0 8s on 0 4s off 0 8s on 4s off 3 5 0 4s on 0 2s off 0 4s on 0 2s off 0 8s on 4s off 4 6 0 3s on 0 2s off 1s on 0 2s off 0 3s on 4s off O ONOTE IF ALL OF THESE BITS ARE 0 OFF ANY RING WITH A DURATION LONGER THAN 100 MS WILL BE ...

Page 52: ...ata fax CNG tone without physically answering the call After a CNG tone is detected the modem will report RING or RING n to the application software The software can cause the modem to answer the call 2 Detect several DTMF tones without physically answering the call The DTMF tones once detected by the modem will be reported as RING or RING n to the software application With these two functions you...

Page 53: ...after the ring disappears and it will be able to detect the data fax CNG tone and DTMF tones and report them as different types of rings The EDR settings are defined in S register S51 S51 Bit mapped register default 0 Bits Bin Dec Description 7 6 00 0 Disable data CNG tone detection default 01 64 Report RING for data CNG tone 10 128 Report RING 1 for data CNG tone 11 192 Report RING 3 for data CNG...

Page 54: ...and ring detection is as follows ring1 ring2 ring3 3sec 3s 3s 3s S7 time out CID EDR RD EDR RD EDR RD EDR RD CID Caller ID task RD Ring Detection task EDR EDR task O ONOTE DURING THE EDR PERIOD ANY AT COMMAND WILL DISABLE THE EDR FUNCTION EDR Application Example If we use ZFAX as our fax receiving application and we don t want it to answer the call unless it is a fax call the way to set it up woul...

Page 55: ...S51 2 1 to enable DTMF tone detection It is reported as RING If the remote fax machine does not generate the CNG tone ask a fax caller through your answering 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 ...

Page 56: ...44 Special Functions ...

Page 57: ... four major parts in a fax machine the scanner encoding and decoding device modem and printer Before a page can be sent it is first 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 decodes it back to bit mapped image data and prints it on paper Fax Br...

Page 58: ...em supports Group 3 send and receive facsimile functions For normal fax operation you must connect the modem to a computer usually a PC The computer serves as the input output device for the fax function The RS 232 serial connection or the ZyXEL serial port interface connects you modem to the computer Your modem uses the same interface for both data and fax applications In fax operations the modem...

Page 59: ...he Fax Command Sets The EIA Class 1 and Class 2 fax commands are a set of AT fax commands defined by EIA TIA Telecommunications Industry Association for controlling fax modems from a computer through the serial RS 232 interface All fax modems and fax software supporting this standard will be compatible with each other Class 1 commands control on line modem negotiation while Class 2 commands allow ...

Page 60: ...ILITY THIS IS DUE TO THE FACT THAT SOME FAX SOFTWARE PACKAGES MAY GET CONFUSED BY THIS RESPONSE Command Value Description FTS n 0 255 Stop transmission and pause in 10 ms units FRS n 0 255 Wait for silence in 10 ms units FTM MOD Transmit data with MOD carrier FRM MOD Receive data with MOD carrier FTH MOD Transmit HDLC data with MOD carrier FRH MOD Receive HDLC data with MOD carrier The MOD paramet...

Page 61: ...red for FTM FRM 146 V 17 w st 14400 required for FTM FRM w st means with V 17 short training Class 2 Command Set The following Class 2 commands are supported and implemented per TIA PN2388 8 20 90 Command Syntax Description command value Execute a command or set a parameter command Read permissible settings command Read current setting Supported Commands per TIA PN2388 8 20 90 Command Value Descri...

Page 62: ...on ID string for polling Rx FCLASS n Service class selection Refer to FCLASS Class 1 command in previous section FCON DCE responds fax connection FCQ n Copy quality check capability parameter n 0 No copy quality check capability n 1 Only check 1D phase C data n 2 Check both 1D and 2D phase C data FCR n Capability to receive parameter n 0 DCE will not receive message data or poll a remote device n ...

Page 63: ...dified Huffman df 1 Data compression format 2 D modified Read ec 0 Error correction disabled ec 1 Enable error correction mode bf 0 Disable binary file transfer st 0 Minimum scan time line 0 ms st 1 Minimum scan time line 5 ms st 2 Minimum scan time line 10 ms normal 5 ms fine st 3 Minimum scan time line 10 ms st 4 Minimum scan time line 20 ms normal 10ms fine st 5 Minimum scan time line 20 ms st ...

Page 64: ...age follows n 5 Procedure interrupt end of document another document follows n 6 Procedure interrupt end of document FK Regular fax abort command FLID string Local ID string parameter FLO n Flow control options n 0 No flow control n 1 Set XON XOFF software flow control n 2 Set CTS RTS hardware flow control FLPL n Document for polling command n 0 The DTE has no document available for polling n 1 In...

Page 65: ... Page bad procedure interrupt requested n 5 Page good procedure interrupt requested FREL n Phase C received EOL alignment n 0 The EOL patterns are bit aligned as received n 1 The last received bits of EOL patterns are byte aligned by the DCE with necessary zero fill bits inserted Refer to TIA PN 2388 for details FREV Request the DCE revision identification FSPL n Enable polling command n 0 Disable...

Page 66: ...emote capabilities response refer to FDCC command FET n Post page message response refer to the FET n command FHNG n Call termination status response n 00 Normal and proper end of connection n 10 Transmit error on phase A hang up code n 20 Transmit error on phase B hang up code n 40 Transmit error on phase C hang up code n 50 Transmit error on phase D hang up code n 70 Receive error on phase B han...

Page 67: ...ving Group 3 T 4 data In Class 2 fax mode both hardware RTS CTS and software XON XOFF flow control are enabled Class 2 0 Command Set Command Syntax Description command value Execute a command or set a parameter command Read permissible settings command Read the current setting Supported Commands Command Value Description FAA n Auto answer mode parameter n 0 DCE answers as set by FCLASS n 1 DCE ans...

Page 68: ... DCE Receive Copy Quality Correction enabled tq 0 DCE Transmit Copy Quality Checking disabled tq 1 DCE Transmit Copy Quality Checking enabled tq 2 DCE Transmit Copy Quality Correction enabled FCR n Capability to receive parameter n 0 DCE will not receive message or poll a remote device n 1 DCE receives message data or polls a remote device FCT n 0 255 DTE phase C time out parameter n 0 255 1s unit...

Page 69: ...on are accepted negotiated and reported using the FVO response FIP Initialize facsimile parameters to factory default FIS vr br wd l n df ec bf st Current session parameter refer to FDCC Class 2 command in previous section parameter settings FKS Session termination command FLI string Local ID string parameter FLO n Flow control options n 0 No flow control n 1 Set XON XOFF software flow control n 2...

Page 70: ... generated tpr 0 Transmitter Parameters are not reported FCS response reports are suppressed FCS parameter is still loaded tpr 1 Transmitter Parameters are reported FCS response reports are generated idr 0 ID Strings are not reported FTI FCI and FPI response reports are suppressed idr 1 ID Strings are reported FNF FNS and FNC response reports are generated nsr 0 Non standard frames are not reporte...

Page 71: ... threshold parameters pgl 0 64 HEX value Specify the percentage of good lines e g with negotiated number of pixels required for a page considered acceptable The percentage of good lines would be computed by the equation 100 x lc bl lc lc total line count as reported in the FPS response bl bad line count as reported in the FPS response If the resulting value is less than the value in pgl the page i...

Page 72: ...3 Another page next same document procedure interrupt requested ppm 4 Another document next procedure interrupt requested ppm 5 No more documents or pages procedure interrupt requested FHS hsc Call termination status hsc 0 0F Call placement and termination Refer to TIA 592 for details hsc 10 1F Transmit phase A and miscellaneous errors Refer to TIA 592 for details hsc 20 3F Transmit phase B hang u...

Page 73: ...s frame FNS NSS FIF string Report NSS non standard Setup frame FPI CIG ID string Report remote ID response Polling Station ID CIG FPO Remote polling indication FPS ppr lc blc c blc lbc 30 phase C page reception response ppr 1 Received page good ppr 2 Page bad retrain requested ppr 3 Page good retrain requested ppr 4 Page good remote request for procedure interrupt accepted ppr 5 Page bad retrain r...

Page 74: ...er The default serial connection speed is 38400 bps and it is higher than the fax link rate CTS RTS hardware flow control is used to regulate the data flow Your modem accepts the extended fax AT commands to set the modem mode and fax parameters Besides the extended fax AT commands the modem accepts all the other AT commands described in this chapter For instance you can use ATD to make a fax call ...

Page 75: ...de is used with a BBS receiving faxes B2 This mode is for the polling feature of the modem In this mode the modem will send a polling signal to the remote fax device to ask to receive a fax from the remote fax device The received fax data will be sent to the DTE continuously following the connection message B3 Displays the ring cadence Parameter Setting Command Function V0 Set to normal vertical r...

Page 76: ...er 40 ms at 3 85 line mm T 7 7 T 3 85 C5 Set minimum scan line time capability of the receiver 40 ms at 3 85 line mm T 7 7 1 2 T 3 85 C6 Set minimum scan line time capability of the receiver 10 ms at 3 85 line mm T 7 7 1 2 T 3 85 C7 Set minimum scan line time capability of the receiver 0 ms at 3 85 line mm T 7 7 T 3 85 P string Set local phone number to the phone number following the character P c...

Page 77: ...ined in the table below Field Description Snnnn Fax connection speed nnnn is a 4 digit number representing the connection speed nnnn 1440 1200 9600 7200 etc 1440 and 1200 stand for 14400 and 12000 Vn Vertical resolution n 0 or 1 Tn Coding scheme n 0 or 1 Rn Recording width n 0 1 or 2 Ln Recording length n 0 1 or 2 Cn Scan line time n 0 to 7 P string Remote fax number After each fax disconnection t...

Page 78: ...odem is full and cannot accept any more data The computer should send data only when CTS is ON RTS is used by the computer to signal your modem that the fax message is finished As soon as RTS off is detected the modem starts the post message handshaking to make sure that the remote facsimile has received the fax message successfully Then it hangs up the phone and sends a status report to the DTE I...

Page 79: ...ollowing set up changes in your BBS 1 Add the string B1 FCLASS 6 to the init string Be sure the FCLASS 6 command is the last command 2 Change one of the messages in the list to CONNECT FAX 3 Set the external mail string to ZyXEL and give it an error level 4 In your BBS batch file if the error level matches the external mail execute rcvfax 2 p comport w workpath This setting will enable the BBS to ...

Page 80: ... CONNECT 2400 38400 CONNECT 14400 Set external mail as String Error Level 1 ZyXEL 100 2 3 The following is a sample setting in the BINKLEY CFG file for a Binkley system Init AT FX7S0 1 B1 FCLASS 6 ExtrnMail ZyXEL errorlevel ...

Page 81: ...minate current connection attempt when enter in handshaking state Escape sequence code entered in data state wait for modem to return to command state Command Options Function Description Ref A Go on line in answer mode See also S39 2 S43 6 Bn Handshake option S28 7 B0 Select CCITT V 22 for 1200 bps B1 Select Bell 212A for 1200 bps communication Ds Dial s numbers and options that follow see also S...

Page 82: ...ndshake 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 49 Dial number stored in non volatile RAM at location n use to dial two consecutive numbers for bundling or MPPP calls S44 3 En Command mode local echo of keyboard commands S23 0 E0 Echo off E1 Echo on Hn On off hook control H0 Hang up on hook the m...

Page 83: ... dialed out and OFF when carrier is detected Nn n 0 7 5 Ring volume control N0 will disable the audio ring function S24 1 3 O Return to on line state O1 Force modem to request a retrain Qn Result code displayed S23 7 Q0 Modem returns result code Q1 Modem does not return result code Q2 Modem returns result code but quiet after answering on a RING see also S42 2 S40 1 Sr b n Set bit b of S register ...

Page 84: ... Result code options see the Options Table S23 3 5 Zn 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 Extended AT command summary help Extended AT command summary help Description of ATI2 Output The Link Status Report output appears as follows ZyXEL MODEMS LINK STATUS REPORT Chars Sent...

Page 85: ...sed if data compression was enabled Block Framed Octets Delimited by the unique bit pattern 01111110 known as a flag Output Parameter Output Value Description Chars Sent Number of characters DTE has sent to modem Chars Received Number of characters modem has sent to DTE Octets Sent Number of data bytes sent to remote modem Octets Received Number of data bytes received from remote modem Blocks Sent...

Page 86: ...ts For protocol maintenance modem probably recovered T402 Time outs For protocol maintenance modem probably recovered FCS Errors Errors in frame block checksum If there were many FCS Errors you may have experienced problems on the line Round Trip Delay Time Units 1 2400 sec Xmitter Underrun For modem s processor power measurement Receiver Overrun For modem s processor power measurement Disconnect ...

Page 87: ...4 6 Cn Carrier Detect CD options S21 4 C0 CD always ON See also S42 7 C1 CD tracks presence of carrier See also S38 3 S42 7 Dn Data Terminal Ready DTR options See also S25 S21 6 7 D0 Ignore DTR signal assume DTR is always ON D1 108 1 DTR OFF ON transition causes dial of the default number See also AT Dn and S48 4 D2 108 2 Data Terminal Ready DTR OFF causes the modem to hang up D3 Same as D2 but DT...

Page 88: ...e line RJ 11 J1 Multiple phone modem line RJ12 RJ13 Kn Modem error control and data compression S27 0 2 K0 No error control Same as AT K K1 MNP4 See also S41 0 K2 MNP4 MNP5 See also S38 5 S41 0 K3 V 42 MNP4 K4 V 42 V 42bis compatible with K2 See also S38 5 Ln L0 Dial up line S14 2 3 L1 2W leased line L2 4W leased line Mn Synchronous asynchronous mode selection S14 6 7 M0 Asynchronous mode with dat...

Page 89: ...1 S43 3 and S48 5 N1 V 33 14400 12000 models with 4 wire leased lines only N2 V 33 12000 models with 4 wire leased lines only N3 V 32 9600T 9600 7200T 4800 N4 V 32 9600 7200 4800 N5 V 32 4800 N6 V 29 9600 models with 4 wire leased lines only N7 V 29 7200 models with 4 wire leased lines only N8 V 29 4800 models with 4 wire leased lines only N9 V 27bis 4800 models with 4 wire leased lines only N10 V...

Page 90: ...00 4800 N19 V 32bis 7200 4800 N24 BELL 212A 1200 N25 BELL 103 300 N32 G3 Fax V 17 V 29 V 27ter 14400 12000 9600 7200 4800 240 0 See also S42 4 N34 ZyXEL 19200 N35 ZyXEL 16800 N36 ZyXEL 14400 N37 ZyXEL 12000 N38 ZyXEL 9600 N39 ZyXEL 7200 N42 CELL 14400 N43 CELL 12000 N44 CELL 9600 N45 CELL 7200 N46 CELL 4800T N60 V 34 33600 N61 V 34 31200 N62 V 34 28800 N63 V 34 26400 N64 V 34 24000 N65 V 34 21600 ...

Page 91: ...ks 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 S41 5 S44 4 Tn Modem testing S16 T0 Terminate test in progress T1 Initiate Analog Loop back ALB test T3 Initiate Local Digital Loop back LDL test T4 Grant Remote Digital Loop back request from remote modem ...

Page 92: ...AM See also S35 6 Xn Synchronous mode timing clock source selection 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 Received carrier provides synchronous transmit clock signal Remote or Slave clock to pin 15 of EIA 232D Yn Break handling Destructive Brea...

Page 93: ...aracter length C1 11 bit character length C2 9 bit 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 control negotiation fails keep the non error control connection E1 If error control negotiation fails disconnect the call hang up Fn Remote configuratio...

Page 94: ...e 2 security with password check and call back remote user enters the call back number Hn n 0 49 Modify user password table at location n HS Modify supervisory password Default ZyXEL In Command set selection S17 6 7 I0 AT command set I1 V 25bis command set I2 Dumb mode Mn Leased line auto handshake mode selection S14 0 M0 Set to Originate mode M1 Set to Answer mode Pn n 0 15 P9 Set leased line tra...

Page 95: ...r b S37 0 3 b 4 Remote active configuration b 5 Remote factory default configuration Sn Secondary channel options S0 Secondary channel disabled S1 Secondary channel enabled T Recall the last CND Caller ID information S40 2 V View the Password table Wab Write local configuration profile a to remote user profile b and reset remote modem from profile b S36 1 a 0 3 Local user profile number a S37 4 7 ...

Page 96: ...mand Function Description Ref S0 Set the number of rings on which the modem will answer 0 value disable auto answer 000 S1 Counts and stores number of rings from an incoming call 000 S2 Define escape code character default 43 dec A value of 128 255 disables the escape code 043 S3 Define ASCII Carriage Return 013 S4 Define ASCII Line Feed 010 S5 Define ASCII Backspace A value of 128 255 disables th...

Page 97: ...ote 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 hanging up 007 S11 Set duration and spacing in milliseconds of dialed Touch Tones 070 Extended S Registers ATSn x Command bit dec hex Function and description Ref S13 bit dec hex Bit mapped register 000 1 2 2 Capture modem manufact...

Page 98: ...ote clock 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 Bit mapped register 130 0 1 0 0 Even parity 1 1 Odd parity 2 2 No parity 2 0 0 1 stop bit 4 4 2 stop bits 4 3 0 0 10 bit character length C0 8 8 11 bit character length C1 16 10 9 bit character length C...

Page 99: ...ocess 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 S17 bit dec hex Bit mapped register 018 0 0 0 Disable secondary channel default S0 4 1 0 30 0 1E Set leased line transmit power level from 0 to 15 dBm See also S35b3 Default P9 Pn 5 0 0 Normal dial Default D 32 20 Reverse dial go on l...

Page 100: ...ion 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 003 0 0 230400 bps 1 1 115200 bps Default 2 2 76800 bps 3 3 57600 bps 4 4 38400 bps 5 5 19200 bps 6 6 16800 bps 7 7 14400 bps 8 8 12000 bps 9 9 9600 bps 10 A 7200 bps 11 B 4800 bps 12 C 2400 bps 13 D 1200 bps 14 E 460800 bps 15 F 300 bps 16 10 307200 bps 17 11 153600 bps 18 12 1024...

Page 101: ... connection when modem error control handshake fails E0 1 1 Drop connection when modem error control handshake fails E1 1 2 0 0 Speaker always OFF M0 2 2 Speaker ON until carrier is detected default M1 4 4 Speaker always ON M2 6 6 Speaker ON after last digit is dialed out until carrier detected M3 3 0 0 DSR always ON S0 8 8 According to CCITT see also S44 4 S41 5 S1 4 0 0 CD always ON C0 16 10 CD ...

Page 102: ...08 2 DTR OFF causes the modem to hang up and reset the modem to profile 0 after DTR dropped D3 S23 bit dec hex Bit mapped register 105 0 0 0 Command echo disabled E0 1 1 Command echo enabled E1 1 0 0 Tone dial Default T 2 2 Tone dial P 2 0 0 Pulse dial make break ratio 39 61 P0 4 4 Pulse dial make break ratio 33 67 Default P1 3 5 0 0 ATX0 See result code table X0 8 8 ATX1 X1 16 10 ATX2 X2 24 18 AT...

Page 103: ...lume control increment of 2 in decimal value N0 7 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 needs to be OFF before it will be recognized in 10 ms units If S25 0 the delay time is set to 4 ms 000 S26 dec hex RTS CTS delay 000 0 255 0 FF Set the delay in 10 millisecond units between the RTS and modem s CTS res...

Page 104: ...al quality Q0 64 40 Retrain action taken if signal quality Q1 is poor Q1 128 80 Adaptive rate auto fall back forward when signal quality changes 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 11 phone jack default J0 1 1 Multiple phone modem line RJ12 RJ13 phone jack J1 1 0 0 Panel key is normal default Y0 1 2 Panel key is loc...

Page 105: ...bps communication B1 S29 0 49 0 31 Set default dial phone number pointer use AT Zn s to store phone numbers 000 D S31 0 255 0 FF Holds the ASCII decimal value of the XON 017 S32 0 255 0 FF Holds the ASCII decimal value of the XOFF 019 S35 bit dec hex Bit mapped register 0 1 1 Use CELL 4800T trells coded 4800 for V 32 4800 available with cellular mode only 1 2 2 Disable aborting from terminal durin...

Page 106: ... from a hardware reset W0 7 128 80 Enable extended numerical result codes from 50 71 when an error corrected connection is made Use with ATV0 see result code table V0 S23 6 S36 bit dec hex Bit mapped register 000 0 0 0 Deny remote request for configuration Default F0 1 1 Grant remote request for configuration F1 1 0 0 Write from local profile a to remote profile b Wab 2 2 Read from remote profile ...

Page 107: ... bit dec hex Bit mapped register for remote configuration using panel menu control 000 3 0 0 5 0 5 Remote profile number Wab 7 4 0 80 0 50 Local profile number Rab S38 bit dec hex Bit mapped register 000 0 1 1 Repeatedly dialing default number Dn S29 3 8 8 DCD ON OFF sequence follows UNIX standard DCD high before connect message is sent DCD off after last DCE response is sent C1 S21 4 4 16 10 Auto...

Page 108: ...t code 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 Enables type 3 ring detection 6 64 Enables type 4 ring detection S41 bit dec hex Bit mapped register 000 0 1 1 Special MNP compatibility see also S27 0 S38 5 Kn 2 4 4 Disable retrain abort up to 5 min for special satellite line condition S27 6 n 3 8 8 Enable ...

Page 109: ...ode 4 16 10 Disable V 17 14 400 Fax in calling mode no effect to answering mode N32 5 32 20 Disable Data Voice button 6 64 40 Disable RINGING 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 000 0 1 1 Disable ZyXEL 16800 in Multi Auto mode N0 1 2 2 Disable ZyXEL 19200 in Multi Auto mode N0 2 4 4 Disable cellular mode automat...

Page 110: ...de DSn 4 16 10 DSR follows DTR see also S41 5 S1 5 32 20 Enable V 13 half duplex simulation in synchronous mode 6 64 40 When selected with B0 DTE speed fixed at 38400 when the link speed is above 9600 DTE speed fixed at 9600 if link speed is 7200 DTE speed follows link speed When selected with B1 DTE speed fixed at current rate when an ARQ connection is made when a non ARQ connection is made DTE s...

Page 111: ...formation to be reported in raw format 1 2 2 Enable DATA ONLY mode Auto detect V 34 ZyX V 32bis V 22bis V 23 V 21 Bell 103 when answering If the connection try fails the modem will continuously recycle the handshaking procedure until the S7 register times out 2 4 4 Enable data calling tone CNG sending 3 8 8 Reverse the V 23 channel speed Originate mode modem speed Send Receive 1200 75 Answer mode ...

Page 112: ...Default 128 80 For cellular mode only Modem is connected to a mobile phone S50 dec hex Inactively timer in 10 second units 000 0 255 0 FF The modem counts when there is no data flow in or out of the RS 232 serial port A connection is disengaged when the counter reaches the preset value Set value 0 to disable this function S51 bit dec hex Bit mapped register 1 0 0 0 Disables EDR 1 1 Reports RING tw...

Page 113: ...ta CNG tone detection 64 40 Reports RING for data CNG tone 128 80 Reports RING 1 for data CNG tone 192 B2 Reports RING 3 for data CNG tone S52 bit dec hex Bit mapped register 000 4 3 0 24 0 18 Receive level adjustment 0 0 43 dBm Default 8 8 33 dBm 16 10 26 dBm 24 18 26 dBm 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 ...

Page 114: ...rce the modem to use the new values of S18 to fix the baud rate when answering 1 1 Force the modem to use the old values of S18 compatible with 1496 series modem to fix the baud rate when answering Bit S register bit number b used in ATSr b n and ATSr b dec Decimal value x used in ATSn x hex Equivalent Hexadecimal value nnn Factory default when listed in Reference column Note AT is omitted when an...

Page 115: ... 5 CONNECT 1200 6 NO DIAL TONE V V V V V 7 BUSY V V V V V 8 NO ANSWER V V V V V 9 RINGING V V V V V 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 CONNECT 115200 23 CONNECT 230400 24 CONNECT 460800 25 CONNECT 921600 26 CONNECT 307200 27 CONNECT 153600 28 CONNEC...

Page 116: ... one type of Distinctive Ring is turned on S40b3 6 RING n will be reported n Ring Type 1 4 Result Code Chart Symbol Reference V Supported Reports the DTE Speed as cr lf CONNECT DTE_Speed cr lf CONNECT DTE_Speed Protocol DCE_Speed Error_Control Example CONNECT 38400 V 32bis 14400 V 42bis cr lf CONNECT DCE_Speed Error_Code cr lf Example CONNECT 14400 ARQ CONNECT DCE _Speed Error_Code Error_Control E...

Page 117: ...ted Connect Strings for Error Corrected Connections To enable the following numerical ATV0 and verbose ATV1 result codes when an error corrected connection is made set S35 bit 7 to 1 ATS35 7 1 Numerical V0 Verbose V1 Numerical V0 Verbose V1 50 CONNECT 58 CONNECT 16800 51 CONNECT 1200 59 CONNECT 19200 52 CONNECT 2400 60 CONNECT 21600 53 CONNECT 4800 61 CONNECT 24000 54 CONNECT 7200 62 CONNECT 26400...

Page 118: ...106 Status Registers Result Codes ...

Page 119: ... with Self Test The diagnostic tests listed above apply to several modes of operation asynchronous or synchronous error controlled or non error controlled data compression enabled or disabled data mode You can use these capabilities to verify the line condition and the modem s functioning and performance and to locate the source of a communication problem Power On Self Test At each power up or upo...

Page 120: ...e testing of DSP RAM fails condition A 5 DSP RAM FIAL The testing of DSP RAM fails condition A 6 VO CALIBRATION FAIL Analog circuit calibration error 7 VR CALIBRATION FAIL Analog circuit calibration error 8 FR CALIBRATION FAIL Analog circuit calibration error Resetting The Modem A reset command from the panel will restart the power on self test If an error message is displayed on the screen turn o...

Page 121: ...d while the modem is off line Analog Loopback with Self test AT T8 This test generates data from the modem itself instead of input data from the RS 232 interface The data will go through the same path as it would with the Analog Loopback Test In asynchronous mode the pattern consists of printable ASCII characters You can see the result on the screen In the synchronous mode the pattern is made up o...

Page 122: ...ty This test can be initiated by either modem when the modems are on line Remote Digital Loopback with Self test AT T7 This test generates data from the modem itself instead of input data from the RS 232 interface The data will go through the same path as it would with the Remote Digital Loopback Test In asynchronous mode the pattern consists of printable ASCII characters You can see the results o...

Page 123: ...four major line impairments From the impairment readings you can understand the current line condition Your modem also logs line events over a long period so you know what the line condition has been We will describe these readings and logs as follows O ONOTE THE READINGS DISPLAYED ARE NOT MEASUREMENTS AND SHOULD ONLY BE USED AS A REFERENCE Signal to Noise Ratio S N This reading is expressed in 0 ...

Page 124: ...r PJ This reading is expressed in peak to peak degrees for phase jitter in the 20 to 300 Hz frequency range in 0 1 degree resolution Frequency Offset FO Frequency offset is expressed in 0 1 Hz resolution It is the difference between the transmitted carrier frequency and the received carrier frequency Retrain Granted RG The count of the granting of the remote modem s retrain requests Each request i...

Page 125: ...e 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 AT Command Set Problems Problem Your modem does not respond to AT commands Solutions 1 Make sure the DTR LED is ON If it...

Page 126: ...d but did not receive an OK or 0 result code Solutions 1 Your communications software may be using a different COM 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 mode type AT V0 and press Enter with the modem in command state to view the currently act...

Page 127: ...e 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 your communications software are echoing characters to your screen Use the E0 command to disable modem echo or turn off your software program s echo or duplex feature Answer Problems Problem Your modem does no...

Page 128: ...Reference Manual 4 Set Dφ and auto answer if your modem is not connected to RS232 or DTR is not ready Problem When you receive a phone call your modem immediately seizes control of the telephone line Solution Your modem may be configured for auto answering To disable auto answer type ATS0 0 and press Enter with the modem in command state Dialing Problems Problem Your modem does not dial calls Solu...

Page 129: ...pe AT T8 and press the Enter key with your modem in the command state You should see a smooth stair stepping ASCII test pattern flowing diagonally across your screen Connection Problems Problem Your modem disconnects while communicating with a remote system Solutions 1 The remote system may have hung up Type ATI2 and press Enter to view the link status report which will include the reason for the ...

Page 130: ...otocol 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 erased Are you sure Y N 7 Press Y The following message then appears Start programming please upload 8 After the prompt use the XModem protocol to upload the file U336Evv vvv to your modem This step updates the mo...

Page 131: ...r 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 then release the button after 5 seconds A Kernel Program responsible for the update process takes control of the modem It accepts a limited set of AT commands including the ATUPX command 3 Repeat steps 1 through 9 from...

Page 132: ...n LINE and one for an optional connection to a telephone set PHONE The signals on these pins are 1 A 2 RING 3 TIP 4 A1 PC Serial Port Pinouts Signal Pin ITU TSS Signal Name EIA Signal Name Pin Signal Description Direction DTE DCE 1 101 AA Protective Ground GND 2 103 BA Transmitted Data TXD 3 104 BB Received Data RXD 4 105 CA Request To Send RTS 5 106 CB Clear To Send CTS ...

Page 133: ...gnal Ground GND 8 109 CF Data Carrier Detected DCD 15 114 DB Transmit Clock Signal source DCE 17 115 DD Synchronous Receive Clock 18 141 Local Analog Loopback Test 20 108 2 108 1 CD Data Terminal Ready DTR Connect DCE to line 21 140 Remote Digital Loop Test 22 125 CE Ring Indicator RI 24 113 DA Transmit Clock Signal source DTE 25 142 Test Indicator ...

Page 134: ... hardware handshaking cable Mac Din 8 Modem DB 25 Description 1 4 20 DTR to RTS and DTR Hardware Handshaking Out 2 5 CTS to CTS Hardware Handshaking In 3 2 TX to TXD Data sent 4 7 GND Ground 5 3 RX to RXD Data received 6 not connected 7 8 GPI to CD Carrier detected 8 7 GND Ground needed for RS 232 connections ...

Page 135: ...Connector Pinouts 123 ...

Page 136: ... Flash EPROM 4 72 121 Upgrading 121 Handshaking 113 125 Hyper Terminal 14 17 Indicator Lights 113 Kernel Recovery 122 LCD display 7 10 Leased Line Handshaking 28 Auto 28 Manual Connect 28 Leased Line Operation Terminating a Connection 29 Leased Line Operation Aborting 29 LEDs 7 118 Line Condition Status Display 113 Loopback Tests 111 Macintosh Computers 3 24 25 125 Serial Port 25 Software tips 25 ...

Page 137: ...DRV 23 S register 20 21 39 41 71 72 85 103 Technical Specifications 5 Testing your modem 17 Trouble Shooting Answer Problems 118 AT Command Set Problems 115 Command Echo Problems 117 Connection Problems 119 Data Transfer Problems 119 Dialing Problems 118 UART 16450 23 UNIX 3 26 96 Serial cable 26 Software tips 26 User Profiles 22 V 25bis 3 82 88 ZyXEL Serial Parallel I O Card 24 ...

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