Zyxel 288S - Manuals

Foreword iv The Load Number (LN) assigned to each terminal device denotes the percentageof the total load to be connected to the telephone loop used by the device withoutoverloading. The termination on a loop may consist of any combination ofdevices, subject only to the requirement that the total of...

Table of Contents Foreword........................................................................... i Limited Warranty ............................................................................................. iCopyright 1996 by ZyXEL ...............................................................

Chapter 1 - Introduction 1-1 Chapter 1 - Introduction Congratulations on the purchase of your Omni 288S modem - one of ZyXEL'spremier high-performance products. The Omni 288S is world renown for itsability to maintain ultra high speeds and clear, quality connections whilecommunicating around the glo...

Chapter 1 - Introduction 1-2 Chap 13: Diagnostics & Troubleshooting Tips for resolving modem problems and for using the Omni 288S’s diagnosticcapabilities. Appendix A: Upgrading Your Modem Describes the process for upgrading the Omni 288S with flash EPROM. Appendix B: Contact ZyXEL How to contac...

Chapter 1 - Introduction 1-3 Required Equipment In addition to the ZyXEL Omni 288S modem you just purchased, you must havethe 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-...

Chapter 1 - Introduction 1-4 „ 13 LED lights „ Extended AT command set with V.25bis „ ZyCellular Protocol for demanding cellular operations - data and faxtransmission over cellular networks Intelligent Features „ Automatic data, fax and voice call detection allows you to use a singletelephone line t...

Chapter 1 - Introduction 1-5 „ Microphone jack is provided to increase the quality of voice recordings „ Speaker jack lets you plug in an external speaker for clearer output ofrecorded messages. „ 2, 3, 3-bit new and 4-bit ADPCM for high quality voice digitization withspeech compression at 19.2Kbps,...

Chapter 2 - Installation 2-1 Chapter 2 - Installation This chapter covers the steps required to install your modem, install and configurethe Windows 95 driver, as well as optional steps you may wish to take in thesetup of your Omni 288S. More detailed instructions for various types ofcomputers, such...

Chapter 2 - Installation 2-2 type of UART installed in your computer. If your computer hasa 16450 UART, either replace it with a 16550 UART or add aserial card with a 16550 UART to your system. 5. Connect the telephone cord. Plug one end of the supplied telephone (RJ-11) cord into the LINE jack on t...

Chapter 2 - Installation 2-3 speaker. To connect two speakers, obtain a dual-plug adapter that allows themodem speaker jack to drive both speakers. This adapter can be found at mostelectronics stores. Driver and Software Installation This section contains step by step procedures for installing the W...

Chapter 2 - Installation 2-5 Click "Close.” This completes the installation of your Omni 288S modem driver.You may now use programs such as "Dial-Up Networking" with your ZyXELmodem. Windows 95 Dial-up Networking If you have not installed the Dial-Up Networking feature in Windows 95, ple...

Chapter 2 - Installation 2-9 If the User name and Password are incorrect or missing, type them in. Click on theConnect button and your Omni 288S will dial the number and establish aconnection to your Internet Service Provider. Note: The default protocol for Dial-up Networking is Point-to-PointProtoc...

Chapter 3 - Basic Modem Operation 3-1 Chapter 3 - Basic M odem Operation This chapter covers the basic commands and techniques involved in modemoperation. In many cases, this is the only information you will need in order to getyour Omni 288S up and running with communication software, and to start ...

Chapter 3 - Basic Modem Operation 3-2 Bits per second: 57600 Data bits: 8 Parity: None Stop bits: 1 Flow Control: Hardware Click “OK” when finished. After you have done this, save your new connectionby selecting “Save” from the “File” menu and click “OK.” A new connectionicon will be added to your H...

Chapter 3 - Basic Modem Operation 3-3 Pausing During Dialing: ATDT 9,,555 1212 Note: The pause time for each comma is defined by S Register S8. Default is 2 seconds per comma. Dialing Without Waiting for Dial Tone: ATX0D, 555 1212 Originating a call using an Answer Tone: ATDT 555 1212,,,,,,R Rediali...

Chapter 3 - Basic Modem Operation 3-4 Quick Tips 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&D3&N0. „ The Omni 288S processe...

Chapter 3 - Basic Modem Operation 3-5 AT Command Set/Type Example Fax and Voice AT+ commands AT+FCLASS=2 S-Register command ATS0=1 S-Register bit-mapped command (set S- Register bit 1 equal to 1) ATS13.1=1 S-Register inquiry command ATS0? Or ATS13.1? You may browse the lists of available commands fo...

Chapter 3 - Basic Modem Operation 3-7 Saving Settings and User Profiles There are some cases where you may wish to save the settings you have made asthe default settings that are recalled when the Omni 288S is powered up. TheAT&WZ command selects the current settings as the power-on profile. The...

Chapter 3 - Basic Modem Operation 3-8 AT Command Description E1 Echoes command characters &C1 Carrier detect follows remote carrier &D2 Modem disconnects on DTR on-to-off transition &K4 Use both V.42 and MNP 4 error correction, and useboth V.42bis and MNP 5 data compression &N0 Modem...

Chapter 3 - Basic Modem Operation 3-9 Fewer programs are available to make use of the ZyXEL's fax features. Acommercial software which has found wide acceptance is FaxSTF. It is installedlike a printer driver, thus allowing you to send faxes from almost any programwhich runs on your Macintosh. At th...

Chapter 4 - Advanced Data Communications 4-1 Chapter 4 - Advanced Data Communications This chapter is included as a general reference to the connectors, interfaces,protocols, and standards used by the Omni 288S, including definitions of many ofthe communications-related terms used in this manual. Fr...

Chapter 4 - Advanced Data Communications 4-2 LED V34 V32B Indicates Status OFF OFF Modem is in V.22bis, V.22, or mode slower than 9600bps. OFF ON Modem is in V.32bis or V.32 mode. ON OFF Modem is in V.34 mode. ON ON Modem is in a ZyXEL proprietary mode(ZyX 19.2, ZyX 16.8, or ZyCellular). DTE Interfa...

Chapter 4 - Advanced Data Communications 4-3 RS-232C or EIA-232D/E RS-232C is the Recommended Standard (RS) of the Electronic IndustriesAssociation (EIA), defining the serial communication interface between a DTEand a DCE. The 232 is basically a serial number for the defined standard.Sometimes it is...

Chapter 4 - Advanced Data Communications 4-4 Universal Protocol Compatibility Universal compatibility covers a broad range of ITU-T and BELL standards, andprovides data compression. Various operation modes that can be achieved are as follows: Standard BPS rate(+/-0,01%) Baud rate(+/-0,01%) Modulatio...

Chapter 4 - Advanced Data Communications 4-5 Certain modes, such as the ZyXEL proprietary modes, Fax mode, and Cellularmodes can be added or omitted from the auto-negotiation process using the S-registers settings listed below. Mode Disable Enable ZyXEL 19200 S43.1=1 S43.1=0 * ZyXEL16800 S43.0=1 S43...

Chapter 4 - Advanced Data Communications 4-6 error control protocols, commonly denoted as MNP4 and MNP3. V.42 is astandard developed by ITU-T. V.42 supports both LAPM (Link Access Procedurefor Modem) and MNP4. A V.42 handshake will try an LAPM connection first, andif not successful, it will try MNP4...

Chapter 4 - Advanced Data Communications 4-7 The compression efficiency of V.42bis is generally higher than that of MNP5. Insome cases it can be 50% to 100% higher and in other cases it is just slightlyhigher. In general, it is about 50% more efficient. Run Length Encoding Run-length encoding is app...

Chapter 5 - Synchronous Mode Operation 5-1 Chapter 5 - Synchronous M ode Operation This chapter introduces you to the use of the Omni 288S for synchronousoperation. The modem can be used as a synchronous modem when it is connectedto a synchronous computer or terminal. It is of course necessary to ma...

Chapter 5 - Synchronous Mode Operation 5-2 Clock Options Synchronous data must be transmitted and received with a common timing clock.This timing clock is used to transmit data from the DTE to the modem whichmodulates the data according to this clock. The receiving modem recovers theclock and data f...

Chapter 5 - Synchronous Mode Operation 5-3 You can always use the panel operation to control and configure the modem anduse the manual dial and answer to operate the modem. Dialing from Synchronous Mode 1. Dial from the terminal using asynchronous commands. Set &M1 and use asynchronous AT comman...

Chapter 6 - Leased Line Operation 6-1 Chapter 6 - Leased Line Operation A leased line is a permanent telephone line connection between two fixed points.It can be dedicated copper wires or a leased telephone circuit from the telephonecompany. 4-wire leased lines use one pair of wires to transmit data...

Chapter 6 - Leased Line Operation 6-2 originator and the other as the answerer. You can set this manually orautomatically. Manual Connect Set the modem to leased-line mode. Type the asynchronous command ATD to theoriginating modem and ATA to the answering. Use AT*Mn or set S14b0 to selectoriginate o...

Chapter 7 - Cellular Mode Operation 7-1 Chapter 7 - Cellular M ode Operation The Omni 288S is equipped with a special cellular communication mode whichenables the modem to perform reliable high speed data transmissions overcellular phone links. Although all ZyXEL modems can provide the cellular mode...

Chapter 7 - Cellular Mode Operation 7-2 good for voice, but not suitable for a modem signal. Modem signals, if too strong,may saturate the cellular link and cause distortion. Modem signal power that istoo weak will result in lower signal-to-noise ratio at the receiving end. There isan optimum power ...

Chapter 7 - Cellular Mode Operation 7-3 The MULTI-AUTO mode will automatically adapt to the other modem'scapability, and will request and connect the appropriate mode. If both sides havecellular mode capability and at least one side is using a cellular phone, usingMULTI-AUTO to make or answer a data...

Chapter 7 - Cellular Mode Operation 7-6 Office Installation Naturally, you can install the Omni 288S in an office environment, as with all theother ZyXEL models.

Chapter 8 - Special Functions 8-1 Chapter 8 - Special Functions This chapter describes the special features of the Omni 288S, and offersinstructions on how each is used. Security Functions The Omni 288S provides a security function that prevents unauthorized users frommaking connections. Two types o...

Chapter 8 - Special Functions 8-2 ******** Password: (Enter new supervisor password) ******** Verify: (Enter the new supervisor password again) ******** OK The command AT*Hn will modify the nth user password. You will be promptedto enter the supervisor password first and then be prompted to enter th...

Chapter 8 - Special Functions 8-6 feature. For most other Caller ID schemes, only the Callertelephone number is provided. Distinctive Ring Distinctive Ring is a phone service that may be offered by your phone company.Check your phone company for availability. With this service, you can haveseveral p...

Chapter 8 - Special Functions 8-8 Setting Up EDR The new EDR can be used at home where multiple phones are installed inparallel. Once this function is enabled, the modem will go into EDR mode afterthe ring disappears, and it will be able to detect the data/fax CNG tone andDTMF tones, and report them...

Chapter 8 - Special Functions 8-9 The timing relationship between the Caller ID (if enabled), EDR, and ringdetection is as follows: ring1 ring2 ring3***--------***--------***------------------------------ 3sec 3s 3s 3s S7 timeout +------+---+------+---+------+---+-------------+---- CID/EDR RD EDR RD...

Chapter 9 - Fax Operation 9-1 Chapter 9 - Fax Operation The Omni 288S can be used as a fax machine, and this chapter explains how. Inthe sections below, we will describe how the modem works as a fax machine, theITU-T T.30 fax protocol, the Class 1, 2, and 2.0 fax commands and ZyXELextended fax AT co...

Chapter 9 - Fax Operation 9-2 image data transfer. The computer handles image data creation, capturing,conversion, compression, decompression, retrieving, and storing. ITU-T T.30 Fax Protocol The ITU-T T.30 fax protocol is known as the G3 fax handshake signals andprocedures. The modem takes full con...

Chapter 9 - Fax Operation 9-3 Class 1 Command Set Command Value Description +FCLASS=n Service class selection n=0 Set to Data mode n=1 Set to Class 1 mode n=2 Set to Class 2 mode n=2.0 Set to Class 2.0 mode n=6 Set to ZFAX mode n=8 Set to Voice mode Note: If S57.4=0 (default), the response to the +F...

Chapter 9 - Fax Operation 9-4 Class 2 Command Set The following Class 2 commands are supported and implemented per TIAPN2388 (8/20/90). Command Syntax Description +<command>=<value> Execute a command or set a parameter. +<command>=? Read permissible settings. +<command>? Read...

Chapter 9 - Fax Operation 9-5 Command Value Description +FCTCRTY=<value> 0-255 ECM retry count; in Error Mode only:The sender will try to send a partial page 4times. <value>=0 to 255; units of 4 retries. Ifthe Continue To Correct (CTC) count is 0, itwill not make any further attempts. +F...

Chapter 9 - Fax Operation 9-7 Command Value Description n=1 Received page good. n=2 Page bad; retrain requested. n=3 Page good; retrain requested. n=4 Page bad; procedure interrupt requested. n=5 Page good; procedure interrupt requested. +FREL=n Phase C received EOL alignment: n=0 The EOL patterns a...

Chapter 9 - Fax Operation 9-8 Response Value Function and Description +FNSF:"HEX string" Report the non-standard facilities frame response. +FNSS:"HEX string" Report the non-standard setup frame response. +FPOLL Remote polling indication. +FPTS:n Receive page transfer status response...

Chapter 9 - Fax Operation 9-11 Command Value Description +FRQ=pgl, cbl Quality thresholds parameters: pgl=0-64(HEXvalue) Specify the percentage of good lines (e.g. withnegotiated number of pixels) required for apage considered acceptable. The percentage ofgood lines would be computed by the equation...

Chapter 9 - Fax Operation 9-12 Response Value Function and Description hsc=20-3F Transmit phase B hang up codes. Refer toTIA-592 for details. hsc=40-4F Transmit phase C hang up codes. Refer toTIA-592 for details. hsc=50-6F Transmit phase D hang up codes. Refer toTIA-592 for details. hsc=70-8F Receiv...

Chapter 9 - Fax Operation 9-13 Response Value Function and Descriptionparameters. +FTI:"TSI ID string" Remote ID response-Transmit Station ID(TSI). +FVO Report transition to voice. Extended Fax AT Command Set Extended Fax AT Commands are unique to ZyXEL modems. The computercontrols the modem...

Chapter 9 - Fax Operation 9-14 Command Function #B3 Displays the ring cadence. Parameter Setting Command Function #V0 Set to normal vertical resolution. #V1 Set to high vertical resolution. #T0 Set to one dimensional coding scheme. #T1 Set to two dimensional coding scheme. #R0 Set recording width: 1...

Chapter 9 - Fax Operation 9-15 Status Report Result Codes When the Omni 288S is set in the fax mode, each ATD or ATA command willmake the modem try to establish a fax connection. The Omni 288S will send astatus report result code back to the DTE (computer). NO DIAL TONE Tried to dial but no dial ton...

Chapter 9 - Fax Operation 9-16 Flow Control In extended fax AT command mode, the Omni 288S always uses hardware(CTS/RTS) flow control. The flow control signaling used sending a fax is: „ CTS is used by the Omni 288S to flow control the DTE. When the modemturns CTS off, the buffer inside the modem is...

Chapter 9 - Fax Operation 9-17 X7#B1+FCLASS=6 „ Change the connection message to: 300 CONNECT 4800 CONNECT 4800 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 23 The following is a s...

Chapter 10 - Voice Mode Operation 10-1 Chapter 10 - Voice M ode Operation Voice mode refers to the Omni 288S’s ability to digitize incoming voicemessages, which the computer stores and forwards. It also means the modem canplayback the recorded digitized voice either off-line for local message listen...

Chapter 10 - Voice Mode Operation 10-2 Automatic Detection of Voice, Data, Fax Since there is no way to standardize the way a human voice should behave intelephone calling and answering, it is nearly impossible to automaticallydistinguish a voice call from a fax call from a data call. One common way...

Chapter 10 - Voice Mode Operation 10-3 Choose your Input/Output Device by typing the appropriate AT commands. To select the telephone (connected to phone jack) as your I/O device, type: AT+VLS=1<Enter> To select the external microphone as your input device, type: AT+VLS=8<Enter> To selec...

Chapter 10 - Voice Mode Operation 10-4 Commands DCE Responses Description AT+VLS=0 OK Deactivate internal speaker. AT+FCLASS=0 OK Return to the data mode. Plaing a voice file through the phone line Commands DCE Responses Description AT+FCLASS=8 OK Switches to voice mode. AT+VSM=? (reference table) L...

Chapter 10 - Voice Mode Operation 10-5 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 VCON Connect to line. AT+VTX CONNECT <DATA><DLE>c or<DLE&g...

Chapter 10 - Voice Mode Operation 10-6 Voice States and Operation Modes The Omni 288’s Voice Mode DCE control interface adheres to the TIA TR29.2committee IS-101 Interim Standard. ZyXEL is continuously enhancing itsmodems' voice capability and voice feature implementation. Please refer tofuture manu...

Chapter 10 - Voice Mode Operation 10-7 The Voice Command State provides several DTE options. The modem may waitfor an unspecified time after playing a welcome message, or switch to othermodes as part of a DTE call discrimination algorithm. Voice Data States The DCE is in Voice Data State when the DC...

Chapter 10 - Voice Mode Operation 10-8 1. monitors the line we which connects the DCE to the remote station or to one or more local devices t detect events which the DCE reports to the DTE.These events pertain to signals carried over the line such as tones, and toPSTN -generated control and notifica...

Chapter 10 - Voice Mode Operation 10-9 <code> Event Report Description 7 (0x37) DTMF 7 8 (0x38) DTMF 8 9 (0x39) DTMF 9 0 (0x30) DTMF 0 A (0x41) Extended Keypad DTMF A B (0x42) Extended Keypad DTMF B C (0x43) Extended Keypad DTMF C D (0x44) Extended Keypad DTMF D * (0x2A) Extended Keypad DTMF *...

Chapter 10 - Voice Mode Operation 10-10 <code> Event Report Description u (0x75) Turn up the volume or gain by one unit. d (0x64) Turn down the volume or gain by one unit. p (0x70) Pause Data State: The DCE suspends sending analog data to the currently selected analog destination. While pausin...

Chapter 10 - Voice Mode Operation 10-11 AT Command Syntax AT is the command line prefix. Voice commands take one of the following forms: Command-Form Syntax Command-Form Function +V<CM>? Read current setting. +V<CM>=? Read permissible settings. +V<CM>=<string> Set single-valu...

Chapter 10 - Voice Mode Operation 10-12 The DTE can select the flow control method in voice mode by using the +FLOcommand (defined in Class 2 and 2.0). Supported Commands in Voice Mode Operation „ „ ATD (with +FCLASS=8) This command causes the DCE to dial a phone number. The DCE uses the currentdest...

Chapter 10 - Voice Mode Operation 10-14 <method> Flow Control Method 0 XON/XOFF and RTS/CTS flow control turned off 1 Use software XON/XOFF flow control in either direction. 2 Use hardware RTS/CTS flow control. The DCE returns the OK result code if the DCE accepts the command. The DCEreturns t...

Chapter 10 - Voice Mode Operation 10-16 This command causes the DCE to start the voice transmission process. The DCEbegins the Voice Transmission Mode by returning the CONNECT result code tothe DTE. After this report, the DCE accepts <DLE> shielded voice data from theDTE. The DTE shall send th...

Chapter 11 - AT Command Set Summaries 11-1 Chapter 11 - AT Command Set Summaries Basic AT Command Set Command Options Function & Description Ref. A/ Re-execute the last command once A> Re-execute the last command once or repeat the last callup to 9 times. (See also S8) <any key> Termina...

Chapter 11 - AT Command Set Summaries 11-3 Description of ATI2 Output: The Link Status Report output appears as follows: ZyXEL MODEMS LINK STATUS REPORT Chars Sent 0 Chars Received 0 Octets Sent 0 Octets Received 0 Blocks Sent 0 Blocks Received 0 Blocks Resent 0 Max Outstanding 0 Max Block Size 0 Re...

Chapter 11 - AT Command Set Summaries 11-4 Extended AT& Command Set Command Options Function & Description Ref. &Bn Data rate, terminal-to-modem. (DTE/DCE) S28.6 &B0 DTE rate follows connection rate. (See also S44.6) &B1 * DTE/DCE rate fixed at DTE setting (See also S18, S20, and...

Chapter 11 - AT Command Set Summaries 11-7 Extended AT* Command Set Command Options Function & Description Ref. *Cn Character length, including start, stop and parity bit. S15.3-4 *C0 * 10-bit character length. *C1 11-bit character length. *C2 9-bit character length. *C3 8-bit character length. ...

Chapter 11 - AT Command Set Summaries 11-8 Command Options Function & Description Ref. a=0-3 Local user profile number “a” S37.4-7 b=0-3 Remote user profile number “b” S37.0-3 b=4 Remote active configuration b=5 Remote factory default configuration *T Recall the last CND (Caller ID) information....

Chapter 12 - Status Registers & Result Codes 12-1 Chapter 12 - Status Registers & Result Codes S-Register Descriptions In most bit-mapped S-registers, the default bit value is 0. Non-0 default values arefollowed by an asterisk. In some cases, default values are shown in the refence columnpre...

Chapter 12 - Status Registers & Result Codes 12-10 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 AT command is refe...

Chapter 12 - Status Registers & Result Codes 12-11 ATV0 ATV1 X0 X1 X2 X3 X4 X5 X6 X7 34 CONNECT 41600 % % % % @ 36 CONNECT 24960 % % % % @ 37 CONNECT 20800 % % % % @ 39 CONNECT 28800 % % % % @ $ # 40 CONNECT 26400 % % % % @ $ # 41 CONNECT 24000 % % % % @ $ # 42 CONNECT 21600 % % % % @ $ # * Use ...

Chapter 13 - Diagnostics & Troubleshooting 13-1 Chapter 13 - Diagnostics & Troubleshooting Diagnostics The Omni 288 is equipped with several diagnostic capabilities: „ Power-on Self Test „ Analog Loop-back Test „ Digital Loop-back with Self-Test „ Remote Digital Loop-back Test „ Remote Digit...

Chapter 13 - Diagnostics & Troubleshooting 13-2 Resetting The Modem If you change the modem's setting and cannot get it back, or if you just want to getback to the factory default state, the following reset procedure will reset themodem to the factory state. This procedure also causes the modem ...

Chapter 13 - Diagnostics & Troubleshooting 13-3 characters. You can see the result on the screen. In the synchronous mode, thepattern is made up of scrambled binary 1 and the Throughput Meter will change toa Bit Error Rate Meter. The left reader displays accumulated bit errors while theright rea...

Chapter 13 - Diagnostics & Troubleshooting 13-4 Dialing Indicator The V32b LED will flash on and off for 1/2 second each to indicate that themodem is dialing. This flash will continue after dialing until a carrier is detected.Therefore, the V32b LED will also flash in leased-line modem connectio...

Chapter 13 - Diagnostics & Troubleshooting 13-5 „ „ Problem You typed an AT command, 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 sameCOM po...

Chapter 13 - Diagnostics & Troubleshooting 13-7 You can make a data connection with a remote modem, but encounter frequenterrors during data transfers. „ „ Solutions 1. Your modem and communications software may be configured for different flow control methods. Be sure your modem and software ar...

Appendix A - Upgrading Your Modem A-1 Appendix A - Upgrading Your Modem Upgrading by Flash EPROM 1. Obtain the new firmware by downloading from the ZyXEL BBS, WWW or FTP site. (See Appendix B - Contacting ZyXEL). 2. Turn on your computer. 3. Turn on your Omni 288S modem. 4. Start any communications ...

Appendix B - Contacting ZyXEL B-1 Appendix B - Contacting ZyXEL ZyXEL takes pride in it products and its customers. We are continually striving toimprove our line by engineering them with your current and future needs in mind. To help us in that effort, we encourage your comments. For your convenien...

Appendix B - Contacting ZyXEL B-2 Online Access You can also contact ZyXEL via the Internet using E-mail, our Web site, or FTP,and through CompuServe. Internet E-mail Sales inquiries: [email protected] Technical support: [email protected] ; in the U.S. or [email protected] ; outside the U.S. Wor...

Appendix C - Connector Pinouts C-1 Appendix C - Connector Pinouts Phone Jack Pinouts The Omni 288S is equipped with two RJ11 phone jacks: 1. one for the dail-up line connection (LINE) 2. one for an optional connection to a phone set (PHONE) The signals for these pins are: 1 A 2 RING 3 TIP 4 A1 The s...

Appendix C - Connector Pinouts C-2 Macintosh Serial Port Pinouts The following table shows the wiring of a modem Macintosh hardwarehandshaking cable: MacDin 8 ModemDB 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...

Glossary D-1 Analog: Not digital. Analog quantities may have any value. Analog loopback test: Testing method in which the modem's analog output signal isconnected to the analog input. Answer: In a connection between two modems, one modem works as the recipient (inanswer mode) and the second modem as...