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ZyXEL Communications Omni 288S, User Manual

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Chapter 7 - Cellular Mode Operation

7-4

If you are using a cellular phone data interface adapter, the following figures
illustrate three installation examples. The figures are illustrated with a U-1496P
model. You can use the Omni 288S, in the same way.

The following is an example of a mobile phone that has a handset cradle and a
separate transceiver and handset.

The following is an example of a mobile phone that has a separate transceiver and
handset.

The following is an example of a one-piece hand-held mobile phone.

Summary of Contents for Omni 288S

Page 1: ...Omni 288S User s Manual JiH5 35 39 5 3 22 44 3...

Page 2: ...ranty Card for your Return Material Authorization number RMA Products must be returned Postage Prepaid It is recommended that the unit be insured when shipped Any returned products without proof of pu...

Page 3: ...on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Changes or modifications not expressly approved by the party resp...

Page 4: ...network protective operational and safety requirements IC does not guarantee that the equipment will operate to a user s satisfaction Before installing this equipment users should ensure that it is p...

Page 5: ...se emissions from digital apparatus set out in the radio interference regulations of Industry Canada Telephone Company Requirements It is not necessary to notify your telephone company before installi...

Page 6: ...ftware Installation 2 3 Windows 95 Driver Installation 2 3 Windows 95 Dial up Networking 2 5 Setup for DOS Fax Modem Software 2 9 Chapter 3 Basic Modem Operation 3 1 Understanding AT Commands 3 1 Usin...

Page 7: ...UART 4 2 Serial Port 4 2 RS 232C or EIA 232D E 4 3 Serial RS 232C Cable 4 3 Communication Protocols and Speeds 4 3 Universal Protocol Compatibility 4 4 Choosing the Modem Link Options 4 4 Setting the...

Page 8: ...6 Extended Distinctive Ring EDR 8 7 Setting Up EDR 8 8 EDR Application Example 8 9 Chapter 9 Fax Operation 9 1 Fax Basics 9 1 Fax Branding 9 1 Modem as Fax Machine 9 1 ITU T T 30 Fax Protocol 9 2 Fax...

Page 9: ...0 12 Voice Mode Action Commands 10 14 Voice Mode Configuration Commands 10 16 Chapter 11 AT Command Set Summaries 11 1 Basic AT Command Set 11 1 Description of ATI2 Output 11 3 Extended AT Command Set...

Page 10: ...cting ZyXEL B 1 ZyXEL Phone Numbers B 1 Online Access B 2 Internet B 2 CompuServe B 2 Appendix C Connector Pinouts C 1 Phone Jack Pinouts C 1 PC Serial Port Pinouts C 1 Macintosh Serial Port Pinouts C...

Page 11: ...d functions and helpful hints to get you started Chapter 4 Advanced Data Communications Detailed information on protocols and standards supported by the Omni 288S Chapter 5 Synchronous Mode Operation...

Page 12: ...Modem Enclosed Equipment Before you proceed further please check all items you received with your modem againgt this list to make sure nothing is missing The complete package should include one 1 Omn...

Page 13: ...a Registered Owner Complete the pre addressed Warranty Registration Card and place it in the mail Registered owners will receive future product information and update announcements Warranty registrati...

Page 14: ...authorized callers only Caller ID identifies incoming calls before you answer you must subscribe to this service through your telephone company in order for your Omni 288S to identify callers Distinc...

Page 15: ...tone detection Voice AT V IS 101 command set Technical Specifications Operating mode auto dial answer Flow control software XON XOFF or hardware CTS RTS Data Voice toggle switch Configuration setting...

Page 16: ...ging your modem and computer it is recommended that you connect the power adapter to a surge protector Power To To Serial To Line To Phone Switch Power Port wall jack Supply Caution Use only the power...

Page 17: ...ailed the self test Consult Chapter 13 of this Manual for troubleshooting information Optional Steps for Omni 288S Installation The Omni 288S is equipped with a telephone jack and speaker and micropho...

Page 18: ...ion contains step by step procedures for installing the Windows 95 and NT drivers and configuring Dial up Networking for the Omni 288S Windows 95 Driver Installation Open the Control Panel by double c...

Page 19: ...updated INF file from ZyXEL s FTP Website or BBS use Browse to find the location of the updated INF file click Open Then click OK Select Omni288S from the list Then click Next Select the COM port you...

Page 20: ...g If you have not installed the Dial Up Networking feature in Windows 95 please install it before you continue Double click on the My Computer icon and then double click on the Dial up Networking icon...

Page 21: ...he phone number to your ISP or whatever host you are calling into Click on the Next button Click on the Finish button A new icon is created in the Dial up Networking folder Right click on this icon Th...

Page 22: ...e button These options are mostly host or server specific If you are using PPP use the default settings shown above If you are logging on to an Internet connection then select TCP IP If you are connec...

Page 23: ...n leave the Server assigned IP address checked Most servers assign an IP to you when you log in Click the Specify name server address radio button and enter your primary and secondary DNS Domain Name...

Page 24: ...ging on with SLIP accounts vary greatly from ISP to ISP you should consult the technical support department of your service provider for this information Setup for DOS Fax Modem Software After install...

Page 25: ...software is not addressing your modem at the correct COM port Make sure your software is set up for the same COM port to which your modem is connected 6 Type AT and press the Enter key You should see...

Page 26: ...d to be on line or in data mode In this mode the characters sent to the Omni by your computer are transmitted to the remote modem rather than being interpreted by the Omni as commands Using the Window...

Page 27: ...command is only used to answer an incoming call made from another modem Thus the high pitched noise you will hear from the speaker To abort the operation press any key or select Disconnect from the Ca...

Page 28: ...lly Answering a Call ATA Take modem off hook ATH1 Hang up modem on hook ATH0 Manually Disconnecting a Call ATH Making Your First Connection For this example we will use the connection you created in t...

Page 29: ...bably set to off In this case issue the ATE1 command When a command is successfully issued and accepted a modem responds with what is called a Result Code The Omni 288S supports both verbose result co...

Page 30: ...telephone ring was detected when dialing The speed protocol and error control data compression method used If your modem has detected an incoming ring Result codes can originate from any of eight res...

Page 31: ...rofiles that can be accessed through simple AT commands This section covers the topics of storing phone numbers and saving default settings in the power on profile Storing Phone Numbers The AT command...

Page 32: ...keep the cable as short as possible The serial port is driven by interrupts Every interrupt needs a certain amount of overhead processing time Too many interrupts reduce the computer s efficiency The...

Page 33: ...2 byte transmission and a 32 byte receival FIFO to increase any comm program s efficiency Helpful Hints for Mac Computers Special AT Command Settings for Mac For operation with Mac computers you may u...

Page 34: ...ports at speeds up to 230 4 Kbps These drivers are currently available for Power Macs and AV Macs only Helpful Hints for UNIX Based Computers Serial Cable Please consult the documentation that came w...

Page 35: ...tatus indicators and their meanings LED State Indicates Status AA ON Modem will automatically answer incoming calls OFF Modem will not auto answer incoming calls CD ON Modem has detected a valid carri...

Page 36: ...gnal is sent character timing is recovered from the data itself A PC s COM1 and COM2 are asynchronous serial ports Most PCs and UNIX systems serial data communications are asynchronous The serial data...

Page 37: ...232C are not used in common applications and a 9 wire RS232C cable is sufficient in most applications The PCAT s serial port has only 9 connector pins thus eliminating unnecessary pins For high speed...

Page 38: ...7bis 2 400 1 200 4 DPSK 1800 V 26bis 2 400 1 200 4 DPSK 1800 V 23 1200 75 1200 75 FSK V 23 600 75 600 75 FSK V 22bis 2 400 600 16 QAM 1200 Orig 2400 Ans V 22 1 200 600 4 DPSK 1200 Orig 2400 Ans V 21 3...

Page 39: ...set B0 3 To force the modem to use a fixed baud rate when answering set S18 to the corresponding value S18 Speed S18 Speed 0 Disable fixed rate 15 300 bps 1 115200 bps 16 307200 bps 2 76800 bps 17 15...

Page 40: ...nowledged Let us assume 18 blocks were transferred and the first 14 blocks were acknowledged If no acknowledgment for block 15 is received in a given time this block must have been damaged Acknowledgm...

Page 41: ...oken for a character string is sent The modem adaptively builds a dictionary of string tokens according to data that appears Omni modems support a dictionary size up to 2K string tokens The input data...

Page 42: ...ll it will drop RTS to signal the modem to stop sending data to the DTE Turn ON the RTS and the modem will start sending data again to the DTE In asynchronous full duplex applications the Omni 288S al...

Page 43: ...er on profile and the modem will be initialized to synchronous mode M3 with V 25bis command enabled I1 when turned it is turned on A special command RST is provided to get the modem back to asynchrono...

Page 44: ...clock and sends it to the DTE Adaptive rate can be used Default EXTERNAL AT X1 The DTE provides the clock and sends it to the modem Must use auto retrain cannot use adaptive rate SLAVE AT X2 Recovered...

Page 45: ...or by the asynchronous command Zn Use the DEFAULT DIAL parameter menu or Dn command to select the default dial pointer Set D1 and either M1 or M3 then raise DTR from your terminal or communication so...

Page 46: ...be used and the same phone jack is used for both dial up and leased line connections The dial backup feature is not available in this case Power Level Setting The Omni 288S s leased line mode transmis...

Page 47: ...leased line configuration to the power on profile How to designate a profile to be a power on profile is described in Chapter 3 Please remember to set the handshake mode before you save the configura...

Page 48: ...s radio communication using the same frequency Frequency reuse is the principle of cellular phone systems to increase the number of radio channels available Cellular Impairments A common problem in c...

Page 49: ...ar ZyCellular technologies specifically improve the modem data pump s performance with respect to cellular impairments ZyCellular Modes In addition to normal modem fax and voice operation modes the fo...

Page 50: ...both sides have the ZyCellular capability and at least one side is using a cellular phone the connection will automatically be a cellular mode connection such as it would be if it were using CELL 1440...

Page 51: ...he figures are illustrated with a U 1496P model You can use the Omni 288S in the same way The following is an example of a mobile phone that has a handset cradle and a separate transceiver and handset...

Page 52: ...io input output to an outside headphone microphone set A simple adapter cable can be used to connect the RJ11 modem s 2 wire interface to this cellular phone s audio jack In this case you need to manu...

Page 53: ...Chapter 7 Cellular Mode Operation 7 6 Office Installation Naturally you can install the Omni 288S in an office environment as with all the other ZyXEL models...

Page 54: ...the local modem will maintain the connection if the password is OK otherwise the line disconnected With level 2 security dial back the phone number corresponding to the dial in password The line simp...

Page 55: ...evel 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...

Page 56: ...mber The remote profile read and write commands Rab and Wab only work in the on line condition The connection speed and mode do not matter The remote modem must be set to accept remote configuration b...

Page 57: ...ne is the single message format which includes date time and caller ID The other is the multiple message format which also includes the caller name as registered with the phone company The command ATS...

Page 58: ...llows 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 AT T command Setting S48 0 1 wil...

Page 59: ...number for both data and fax A ring signal is a composition of repeated on and off states Different types of rings usually correspond to different compositions of the ON part cadence of the ring The O...

Page 60: ...wering 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 ph...

Page 61: ...r data CNG tone 11 192 Report RING 3 for data CNG tone 5 4 00 0 Disable Fax CNG tone detection default 01 16 Report RING for fax CNG tone 10 32 Report RING 1 for fax CNG tone 110 48 Report RING 2 for...

Page 62: ...swer the call unless it is a fax call the way to set it up would be 1 Set ZFAX to answer on 2 rings 2 Set S51 0 1 to enable EDR and report RING twice The modem will not report a normal RING and ZFAX w...

Page 63: ...end any message via a telephone or fax machine unless such message clearly contains in a margin at the top or bottom of each transmitted page or on the first page of the transmission the date and time...

Page 64: ...ax Command sets The Omni 288S supports four command sets for fax operation Class 1 command set TIA PN 2388 Class 2 command set TIA 592 Class 2 0 command set ZyXEL Extended Fax AT command set Defining...

Page 65: ...RM MOD Receive data with MOD carrier FTH MOD Transmit HDLC data with MOD carrier FRH MOD Receive HDLC data with MOD carrier The MOD parameter for the preceding commands take the following values Value...

Page 66: ...value 0 255 Error threshold multiplier Determine if Copy Quality OK on the T 30 flow chart value 0 to 255 a value of 0 implies that error checking is disabled FBOR n Phase C data bit order n 0 Select...

Page 67: ...mm wd 1 Page width 2048 pixels in 255mm wd 2 Page width 2432 pixels in 303mm ln 0 Page length A4 297mm ln 1 Page length B4 364mm ln 2 Page length unlimited length df 0 Data compression format 1 D modi...

Page 68: ...ment 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...

Page 69: ...ue Function and Description FCFR Confirmation FCIG string Report remote ID response CIG FCON Facsimile connection response FCSI string Report remote ID response CSI FDCS vr br wd ln df ec bf st Report...

Page 70: ...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...

Page 71: ...e last received bits of T 4 EOL patterns are byte aligned by the DCE with necessary zero fill bits inserted FIE n Procedure interrupt parameter n 0 Procedure interrupt requests from the remote station...

Page 72: ...d 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 reported FTI FCI and FPI response reports are suppr...

Page 73: ...ry value n 0 255 units of 4 retries FSP n Enable polling command n 0 Disable polling n 1 Enable polling Class 2 0 Command Responses Response Value Function and Description FCI CSI ID string Report rem...

Page 74: ...SC non standard Commands frame FNF NSF FIF string Report NSF non standard Facilities frame FNS NSS FIF string Report NSS non standard Setup frame FPI CIG ID string Report remote ID response Polling St...

Page 75: ...d to send the command ATFCLASS 6 first Following are the fax related AT commands Mode Setting Command Function F Set the modem into V17G3 FAX mode same function as the extended AT command AT N32 B0 Se...

Page 76: ...receiver 20 ms at 3 85 line mm T 7 7 T 3 85 C1 Set minimum scan line time capability the receiver 5 ms at 3 85 line mm T 7 7 T 3 85 C2 Set minimum scan line time capability the receiver 10 ms at 3 85...

Page 77: ...x parameters explained 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 1...

Page 78: ...age The following flow control signaling is used while receiving a fax CTS is not used when receiving fax RTS is used to inform the Omni 288S that the computer cannot accept data at this moment The mo...

Page 79: ...800 1200 CONNECT 1200 9600 CONNECT 7200 1275 CONNECT FAX 19200 CONNECT 9600 2400 CONNECT 2400 38400 CONNECT 14400 Set external mail as String Error Level 1 ZyXEL 100 2 3 The following is a sample sett...

Page 80: ...ptive Differential Pulse Code Modulation algorithm can reduce the speech data rate to half the rate and maintain about the same voice quality This algorithm can also be used to reduce the speech data...

Page 81: ...Omni 288S can recognize a fax or data call more quickly if a calling tone is received In this case the voice announcement can be omitted Voice Input Output Devices Microphone and Speaker Jacks On the...

Page 82: ...on software you use will normally perform these functions automatically Recording a greeting message Commands DCE Responses Description AT FCLASS 8 OK Switch to voice mode AT VSM reference table List...

Page 83: ...rn to the data mode Omni 288S as a Voice answering machine Commands DCE Responses Description AT FCLASS 8 OK Switch to voice mode AT VSM reference table List the compression schemes AT VSM 4 OK Select...

Page 84: ...answering machine Command DCE Response Description AT FCLASS 8 OK Switch to voice mode AT VSM reference table List the compression schemes AT VSM 4 OK Select 4 bit ADPCM for greeting message AT VLS 2...

Page 85: ...nt Detection Capabilities of IS 101 as follows Event Description DCE Voice State RING Command Ringback Command Fax or Data Answer e g 2100 Hz Command BUSY Receive and Command DIALTONE Receive and Comm...

Page 86: ...on State when the DCE receives digitized data from the DTE converts the binary data into an analog signal and transmits the analog signal to the remote station or to one or more local device destinati...

Page 87: ...event detection reports than the familiar RING result code used in data fax modems While in voice mode the DCE can detect DTMF tones The DCE will report the event to the DTE at the time of detection b...

Page 88: ...voice energy present at the beginning of the voice receiving session followed by a period of silence greater than the amount of time selected by the VSD command 0x24 Bong Tone 300Hz for 1 second l 0x6...

Page 89: ...ends Data Transmission State The DTE sends this code to indicate the end of the voice data from the DTE and cause the DCE to return to the Voice Command State The DCE will clear its internal transmiss...

Page 90: ...both action types or be of the read or write type only Response Syntax For each command line received the modem issues a response to each command in the command line followed by a final response Each...

Page 91: ...n the DCE has continuously detected ringback for the amount of time specified in S register S7 ATH with FCLASS 8 This command causes the DCE to hang up the phone In voice mode this command is equivale...

Page 92: ...s or disables automatic hang up to a varying degree for data and fax modes hook Hook Control Description 0 The DCE retains automatic hang ups as is normal in the other mode such as hanging up the phon...

Page 93: ...ommands Default Value Silence threshold VSD 15 Hang up code VNH 0 Compression method VSM 2 2 bit ADPCM Beep tone interval VTD 50 unit 10 ms Inactivity timer VIT 70 unit 0 1 s Silence interval VSD 70 u...

Page 94: ...the set 0 9 A D and The DCE interprets the single ASCII character as a DTMF digit with a duration given by the VTD command 2 A string enclosed in square brackets The DCE interprets the values in squa...

Page 95: ...unsigned octet value The normal value is 128 A value larger than 128 indicates a larger gain than normal and a value smaller than 128 indicates a gain smaller than normal A gain value of 56 correspond...

Page 96: ...ns the ERROR result code if timer is out of range AT VIT The DCE returns the current Inactivity Timer timeout value followed by the OK result code AT VIT The DCE returns the permitted Inactivity Timer...

Page 97: ...mplies that the DTE wants the DCE to treat noisier condition as silence The actual value of this subparameter has no physical meaning The range of the sensitivity sds is from 0 to 31 A value of zero d...

Page 98: ...XEL 2 ADPCM 2 7200 8000 9600 11025 3 ZyXEL 3 ADPCM 3 7200 8000 9600 11025 30 ZyXEL 3 ADPCM new 3 7200 8000 9600 11025 4 ZyXEL 4 ADPCM 4 7200 8000 9600 11025 40 DVI ADPCM 4 7200 8000 9600 11025 80 A la...

Page 99: ...1 T Ton dialing S23 1 Pause for a time specified in S6 Remaining digits will be dialed as in band DTMF Return to command state after dialing Hook flash Wait for a 5 second silence before proceeding R...

Page 100: ...Sr b n Set bit b of S register r to value n n is a binary digit 0 or 1 Sr b Display value of bit b of S register r Sr n Set S register r to value n n must be a decimal number between 0 and 255 Sr Disp...

Page 101: ...received from remote modem Blocks Sent Number of data blocks sent to remote modem Blocks Received Number of data blocks received from remote modem Blocks Resent Number of blocks resent due to remote...

Page 102: ...rofile 0 F Load factory settings to RAM as active configuration Gn Guard tone options S28 4 5 G0 No guard tone within USA Canada G2 1800 Hz guard tone Hn Data flow control DTE DCE S27 3 5 H0 Flow cont...

Page 103: ...N17 V 32bis 14400 12000 9600 7200 4800 N18 V 32bis 12000 9600 7200 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 2400 See also...

Page 104: ...current active settings Vn View the n 1 user profile settings n 1 4 V5 View factory default settings Wn n 0 3 Write current settings to user profile n in non volatile RAM See also S35 6 Xn Synchronou...

Page 105: ...check ZyXEL to ZyXEL only G2 Enable type 1 security with password check and call back ZyXEL to ZyXEL only G3 Enable type 2 security with password check G4 Enable type 2 security with password check a...

Page 106: ...t 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...

Page 107: ...a dial tone This register also sets the time out interval for the W dial modifier to wait for the dial tone See also S41b4 003 S7 Set duration in number of seconds modem waits for a carrier 060 S8 Se...

Page 108: ...0 Profile 3 as active settings after power on Z3 128 80 Factory default as active settings after power on Z4 S16 dec hex Test status register 000 0 0 No test in progress T0 1 1 Loop back test in progr...

Page 109: ...18 124800 bps 25 19 62400 bps 26 1A 41600 bps 27 1B 31200 bps 28 1C 24960 bps 29 1D 20800 bps 46 2E 921600 bps Note Only the speeds up to S20 14 are supported by auto speed detection S21 bit dec hex B...

Page 110: ...ratio 39 61 P0 4 4 Pulse dial make break ratio 33 67 Default P1 3 5 0 0 ATX0 See result code table 8 8 ATX1 dec hex AT 16 10 ATX2 40 28 X5 24 18 ATX3 48 30 X6 32 20 ATX4 56 38 X7 6 0 0 Display result...

Page 111: ...Retrain action taken if signal quality Q1 is poor 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...

Page 112: ...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 check G3 128 80 Enable type 2 security with password check and...

Page 113: ...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 los...

Page 114: ...rted 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 pr...

Page 115: ...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...

Page 116: ...the Elite 2864I is shipped ATV0 ATV1 X0 X1 X2 X3 X4 X5 X6 X7 0 OK V V V V V V V V 1 CONNECT V V V V V 2 RING V V V V V V V V 3 NO CARRIER V V V V V V V V 4 ERROR V V V V V V V V 5 CONNECT 1200 6 NO DI...

Page 117: ...e CONNECT 14400 ARQ MNP5 Data compression included SREJ is appended if a V 42 connection with selective reject is established Result Code Field Descriptions Field Name Possible Values Error_Code NONE...

Page 118: ...the panel the modem will test the ROM code checksum system RAM memory DSP code checksum DSP RAM memory EEPROM digital circuits and the analog circuit calibrations The SQ LED flashes if the test fails...

Page 119: ...rror message listed in the table above 5 This hardware reset procedure will reset the supervisor password back to the default ZyXEL But if you set S35 6 1 in profile 0 the supervisor password is prote...

Page 120: ...ing to V 54 If the remote modem supports V 54 and is programmed to grant this kind of request it will resend all of the received data back to the local modem The local terminal or computer will receiv...

Page 121: ...hin 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 res...

Page 122: ...sequence code To return to data state type AT0 and press Enter Problem You receive the ERROR result code after typing an AT command Solution You may have typed a command that is not recognized by you...

Page 123: ...em s RING result codes 3 Check that the DTR LED 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 Modem Reference Manual Problem Whe...

Page 124: ...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 Connect Problems Problem Your modem disconn...

Page 125: ...tep updates the modem s flash EPROM with the latest firmware 9 When the installation is complete the modem restarts automatically Kernel Recovery Mode Your Omni 288S is equipped with ZyXEL s exclusive...

Page 126: ...EL provides the following 24 hour fax numbers for technical support and other comments In the U S 714 693 8811 In Taiwan 011 886 35 782439 ZyXEL BBS Number ZyXEL operates a 4 node BBS 24 hours a day T...

Page 127: ...upport zyxel hinet net outside the U S World Wide Web ZyXEL has a home page on the World Wide Web WWW If you have a WWW browser such as Netscape you can access this page at the following location http...

Page 128: ...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 Se...

Page 129: ...ntosh 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...

Page 130: ...n To send an AT command to a modem you must have communications software running Auto answer Modem s ability to automatically answer a call after a set number of rings Baud Unit of modem transmission...

Page 131: ...bit In asynchronous transfers a character is composed of data bits the actual information and framing bits start bit stop bit s parity bit The framing bits are needed to recognize whether a character...

Page 132: ...le and Programmable Read Only Memory Such a device is used in ZyXEL modems to store settings and profiles An EEPROM does not lose data when the modem is turned off EIA Electronic Industry Association...

Page 133: ...CPUs provide special interrupt vectors These vectors each point to some short program sequence An interrupt stops the currently running program and the segment to which the vector points is executed...

Page 134: ...ngs Parity bit The parity bit is sent as additional information with the data bits in asynchronous transfers It controls the integrity of the transferred data If parity is even the parity bit is set i...

Page 135: ...his 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 the modem returns a silence messag...

Page 136: ...al port Different models are available for PCs Models with an internal buffer usually allow higher transfer rates V The ITU TSS V standards describe data transfer via telephone lines Western jack Tele...

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