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ZyXEL Communications Omni 56K User Manual

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User's Guide for
ZyXEL Omni 56K USB
Modem
ZyXEL
T
I
A
S
OTAL
NTERNET
CCESS
OLUTIONS
ZyXEL Communications Corporation

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Summary of Contents for ZyXEL Communications Omni 56K

  • Page 1 User's Guide for ZyXEL Omni 56K USB Modem ZyXEL OTAL NTERNET CCESS OLUTIONS ZyXEL Communications Corporation...
  • Page 2 User's Guide for ZyXEL Omni 56K USB Modem ZyXEL Omni 56K USB Modem Trademarks: Product and corporate names mentioned in this publication are used for identification purposes only and may be properties of their respective owners. All rights reserved. The contents of this publication may not be reproduced in any part or as a whole,...
  • Page 3 User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 4 User's Guide for ZyXEL Omni 56K USB Modem...

  • Page 5: Limited Warranty

    User's Guide for ZyXEL Omni 56K USB Modem Limited Warranty ZyXEL Omni 56K USB Modem Conditions of ZyXEL Limited Warranty: ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in materials or workmanship for a period of up to two (2) years from the date of purchase. During the...

  • Page 6: Customer Support

    User's Guide for ZyXEL Omni 56K USB Modem If you have questions about your ZyXEL product or desire assistance, contact ZyXEL Communications Corporation offices worldwide, in one of the following ways: METHOD E-MAIL – SUPPORT/SALES LOCATION support@zyxel.com.tw support@europe.zyxel.com WORLDWIDE sales@zyxel.com.tw support@zyxel.com...

  • Page 7: Table Of Contents

    DECLARATION OF CONFORMITY…………………………………………………………………III CHAPTER 1 INTRODUCTION...1-1 Main Features...1-1 CHAPTER 2 INSTALLING ZYXEL OMNI 56K USB ...2-1 Panel Description...2-1 2.1.1 Front Panel LEDs...2-1 2.1.2 Back Panel...2-2 Connecting Your Omni 56K USB...2-3 2.2.1 USB Connector ...2-3 Getting Started...2-4 CHAPTER 3 SPECIFICATIONS AND FUNCTIONAL DESCRIPTION...3-1 Specifications...3-1...
  • Page 8 User's Guide for ZyXEL Omni 56K USB Modem 5.2.2 Service Class 2 Commands ... 5-12 5.2.3 Service Class 2.0 Commands ... 5-16 5.2.4 Voice AT Commands... 5-19 5.2.5 Voice Shielded DTE Commands... 5-21 5.2.6 Voice Shielded DTE Responses... 5-21 S-Register Descriptions... 5-22 5.3.1 Basic S-Registers "ATSn=x"...
  • Page 9 User's Guide for ZyXEL Omni 56K USB Modem List of Tables Table 1. Front Panel LEDs for Omni 56K USB ... 2-1 Table 2. Back Panel Description... 2-2 Table 3. Hardware Specifications ... 3-1 Table 4. Firmware Specifications ... 3-2 Table 5.

  • Page 11: List Of Figures

    Figure 1. Back Panel Switches ...2-2 Figure 2. Back Panel Connections ...2-3 User's Guide for ZyXEL Omni 56K USB Modem List of Figures...

  • Page 13: How To Use This Guide

    ZyXEL Omni 56K USB modem, and the next three chapters provide advanced information for technical users who might need them for programming or other applications. Other Reference To quickly learn how to install and configure your Omni 56K USB modem, please refer to the ZyXEL Omni 56K USB Modem Read Me First. xiii...

  • Page 15: Chapter 1 Introduction

    This chapter introduces you to the features and specifications for the ZyXEL Omni 56K USB modem, and provides instructions for installing your modem. Main Features ZyDAS ZD1051 data pump with V.90 capability. USB technology with USB bus power for easy installation (USB Rev 1.1- compliant) V.90 56K down-stream data transmission...

  • Page 17: Chapter 2 Installing Zyxel Omni 56K Usb

    The description of front panel LEDs is as follows: Table 1. FUNCTION USB Indicator Hook Status User's Guide for ZyXEL Omni 56K USB Modem Installing ZyXEL Omni 56K USB Front Panel LEDs for Omni 56K USB DESCRIPTION ON: USB link is up...

  • Page 18: Back Panel

    User's Guide for ZyXEL Omni 56K USB Modem 2.1.2 Back Panel BACK PANEL Universal Serial Bus connector that connects to any one of your devices with USB port, such as your computer or USB hub. LINE Analog port RJ-11 terminal jack for connecting to wall jack.

  • Page 19: Connecting Your Omni 56K Usb

    When connecting your Omni 56K USB modem, please refer the following figure: Figure 2. Back Panel Connections 2.2.1 USB Connector The Omni 56K USB is an USB (Universal Serial Bus)-based modem, providing a USB connector on the back panel of the device.

  • Page 20: Getting Started

    User's Guide for ZyXEL Omni 56K USB Modem Getting Started When you plug the USB connector attached with your Omni 56K USB to the USB port of your PC (personal computer), the Plug and Play function of the operating system detects if its driver has been installed.

  • Page 21: Chapter 3 Specifications And Functional Description

    Specifications and Functional Description This chapter introduces the specifications and functions of the Omni 56K USB. This chapter and the next three chapters are designed for advanced users who might need more information about Omni 56K USB modem's specifications and functions when programming or other applications.

  • Page 22: Firmware Specification

    User's Guide for ZyXEL Omni 56K USB Modem 3.1.2 Firmware Specification Physical layer for data mode Link layer Flow control Command set Diagnostics Voice Table 4. Firmware Specifications Multi-Auto ACPM of V.90 V.34bis 33.6 Kbps to 2.4 Kbps V.32bis 14.4/12/9.6/7.2/4.8 Kbps V.32 9.6/4.8 Kbps...

  • Page 23: Protocol Support

    . Extended AT& Command Set . Extended AT* Command Set . Extended AT# Command Set . IS101 Voice Command set For more information on detailed command sets, please refer to Chapter 5. User's Guide for ZyXEL Omni 56K USB Modem...

  • Page 24: Omni 56K Usb Capability

    User's Guide for ZyXEL Omni 56K USB Modem Omni 56K USB Capability The data/fax/voice feature of the Omni 56K USB is described in the following table: Table 5. FEATURE Data .2W Dial-Up Line .Multi-auto/V.90/V.34/V.32bis/V.32/V.23/V.22bis/V.22/Bell212A/V.21/Bell 103 .Hardware/Software Flow Control .Error Control/Data Compression .ZyXEL AT Command Set...

  • Page 25: Table 6. Physical Layer Capacity

    This feature refers to stopping and restarting the flow of data into and out of the modem’s transmission and receiving data buffers. Flow control is necessary so that a device does not receive more data than it can handle. The Omni 56K USB provides two kinds of flow control methods.
  • Page 26 Error control keeps the modem data link error-free by detecting and re-transmitting erroneous data. Omni 56K USB modem supports both MNP and V.42 error control protocols. The MNP protocol was an industry standard developed and licensed by Microcom, Inc. Omni 56K USB modem supports level 4 and 3 error control protocols, commonly denoted as MNP4 and MNP3.
  • Page 27 NOTE: 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. User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 28 User's Guide for ZyXEL Omni 56K USB Modem In single message format, the modem sends 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-digit month message, DD is the two-digit date message, hh is the hour and mm is the minute of the time, and CALLER_ID is the phone number of the caller or CALLER_NM his/her name.
  • Page 29 Caller ID schemes, check if the scheme used in your country is supported before using the Caller ID feature. For most other Caller ID schemes, only the Caller telephone number is provided. User's Guide for ZyXEL Omni 56K USB Modem...

  • Page 30: Table 7. Different Ring Types In Register S40

    User's Guide for ZyXEL Omni 56K USB Modem 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 have several phone numbers assigned to the same phone line. The phone company sends a different type of ring signal for each phone number being called.

  • Page 31: Security Function

    User's Guide for ZyXEL Omni 56K USB Modem 3.3.2 Security Function The Omni modem provides a security function, that (when enabled) prevents an unauthorized user from making a connection. Two types of security function are provided. Type 1 security is used when the remote modem is also a ZyXEL modem;...
  • Page 32 User's Guide for ZyXEL Omni 56K USB Modem Enter the original password and a new password and then to re-enter the new password for verification. For example: PASSWORD (Enter supervisor password) ******** (Enter new supervisor password) PASSWORD ******** Verify (Enter the new supervisor password again)

  • Page 33: Fax Function

    It also means that the modem playback the recorded digitized voice on line for a message announcement. Voice IS-101 Command Set Please refer to the Voice command sets in Chapter 5. User's Guide for ZyXEL Omni 56K USB Modem Fax Physical Layer Capacity BAUD RATE MODULATION...
  • Page 34 User's Guide for ZyXEL Omni 56K USB Modem 4-bit Voice Data Compression The main issue in the digitized voice mode is the amount of storage required. A relatively simple ADPCM algorithm can reduce the speech data rate to half the rate and maintain about the same voice quality.

  • Page 35: Chapter 4 Result Codes

    CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIAL TONE BUSY NO ANSWER RINGING CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 19200 CONNECT 7200 User's Guide for ZyXEL Omni 56K USB Modem Table 9. Result Codes Chapter 4 Result Codes...
  • Page 36 User's Guide for ZyXEL Omni 56K USB Modem Result Code for ATV0 ATV1 CONNECT 12000 CONNECT 14400 CONNECT 16800 CONNECT 38400 CONNECT 57600 CONNECT 76800 CONNECT 115200 CONNECT 230400 CONNECT 460800 CONNECT 921600 CONNECT 307200 CONNECT 153600 CONNECT 102400 CONNECT 61440...
  • Page 37 CONNECT 34666 CONNECT 33333 CONNECT 32000 CONNECT 30666 CONNECT 29333 CONNECT 28000 NOTE: If error control result codes are enabled (X4, X5, X6, X7), the resulting message is formatted as the following: User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 38 User's Guide for ZyXEL Omni 56K USB Modem X4: CARRIER Rx Rate. PROTOCOL: Error Control Level COMPRESSION: Compression Level CONNECT DTE Speed X5: CONNECT DTE Speed/Protocol Rx Rate/Error Control Level X6: CONNECT Rx Rate/ARQ X7: CONNECT Rx Rate/ARQ/Error Control Level...

  • Page 39: Chapter 5 Command Sets

    This chapter lists the command set Omni 56K USB supports. These commands include data command sets, fax command sets and voice command sets. Data Command Sets 5.1.1 Basic AT Command Sets COMMAND OPTIONS A> <any key> All of the following commands require an “AT” prefix: Table 11.
  • Page 40 User's Guide for ZyXEL Omni 56K USB Modem COMMAND OPTIONS B0 * 0-9, A, B, C, D #, * n=0-3 E1 * H0 * FUNCTION AND DESCRIPTION Select CCITT V.22 for 1200 bps. Select Bell 212 for 1200 bps communication.
  • Page 41 Reset modem and load user profile n (0- Reset modem and load factory settings. Escape sequence code, entered in data state, wait for modem to return to command state. User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION Ref. S24.4-6 S21.1-2 S23.7...

  • Page 42: Extended At& Command Sets

    User's Guide for ZyXEL Omni 56K USB Modem 5.1.2 Extended AT& Command Sets Table 12. COMMAND OPTIONS &Bn &B0 &B1 * &Cn &C0 &C1 * &Dn &D0 &D1 &D2 * &D3 &F &Gn &G0 * &G2 &Hn &H0 &H3 * &H4...
  • Page 43 V.34 21600 &N66 V.34 19200 &N67 V.34 16800 &N68 V.34 14400 &N69 V.34 12000 &N70 V.34 9600 &N71 V.34 7200 &N72 V.34 4800 &N73 V.34 2400 &N99 V.90 28000 User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION Ref.
  • Page 44 User's Guide for ZyXEL Omni 56K USB Modem COMMAND OPTIONS &N98 &N97 &N96 &N95 &N94 &N93 &N92 &N91 &N90 &N89 &N88 &N87 &N86 &N85 &N84 &N83 &N82 &N81 &N80 &N79 &N78 &Pn &P0 * &P1 &Rn &R0 &R1 * &Sn &S0 *...
  • Page 45 RAM. &Zn=s n=0 to 3 Store phone number/s to NVRAM at location n (n=0 to 3) use AT*Dn or ATS29=n to set the default dial pointer. User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION Ref. S14.1 S28.2-3...

  • Page 46: Extended At* Command Sets

    User's Guide for ZyXEL Omni 56K USB Modem 5.1.3 Extended AT* Command Sets Table 13. COMMAND OPTIONS *C0 * n=0 to 3 *D0 * *E0 * Extended AT* Command Sets FUNCTION AND DESCRIPTION Character length, including start, stop and parity bit: 10-bit character length.
  • Page 47 (See also S41.2). *Q2 * Adaptive rate, automatic fall-back or forward. Disconnect if signal quality is poor. Recall the last CND (Caller ID) information. View password table. User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION Ref. S17.1-4 S27.6-7 S40.2...

  • Page 48: Table 14. Extended At# Command Sets

    User's Guide for ZyXEL Omni 56K USB Modem 5.1.4 Extended AT# Command Sets Table 14. COMMAND OPTIONS 5-10 Extended AT# Command Sets FUNCTION AND DESCRIPTION Modem status in escape state: Disable the report of modem status in escape state. Enable the report of modem status in escape state.

  • Page 49: Fax Command Sets

    <MOD>=3 Carrier The value of <MOD> parameters are listed in the following table: Table 16. VALUE User's Guide for ZyXEL Omni 56K USB Modem Service Class 1 Commands DESCRIPTION n=0: Sets to modem mode n=1: Sets to Class 1 mode n=2.0: Sets to Class 2.0 mode...

  • Page 50: Service Class 2 Commands

    User's Guide for ZyXEL Omni 56K USB Modem 5.2.2 Service Class 2 Commands The following Class 2 commands are supported and implemented as per TIA (Telecommunications Industry Association) PN2388 (dated 8/20/1990): COMMAND SYNTAX +<command>=<value> +<command>=? +<command>? Table 18. Supported Commands (per TIA PN2388 dated 8/20/1990)
  • Page 51 Document for polling command: The DTE has no document available for polling. Indicate a document available for polling. +FMDL? Request DCE model. +FMFR? Request DCE manufacturer. User's Guide for ZyXEL Omni 56K USB Modem DESCRIPTION VALUE br=4 br=5 wd=0 wd=1...

  • Page 52: Table 19. Class 2 Command Responses

    User's Guide for ZyXEL Omni 56K USB Modem COMMAND +FMINSP=n Minimum phase C speed parameter: 2400 bps. 4800 bps. 7200 bps. 9600 bps. 12000 bps. 14400 bps. +FPHCTO= DTE Phase C response time-out: <value> Determine how long the DCE waits for a command after reaching the end of data when transmitting in Phase C.
  • Page 53 Group 3 (T.4) data. In Class 2 fax mode, both hardware (RTS/CTS) and software (XON/XOFF) flow control are enabled. User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION Normal and proper end of connection.

  • Page 54: Service Class 2.0 Commands

    User's Guide for ZyXEL Omni 56K USB Modem 5.2.3 Service Class 2.0 Commands Table 20. COMMAND +FDT +FDR +FKS +FIP +FCLASS=n +FMI? +FMM? +FMR? +FCC=vr, br, wd, ln, df, ec, bf, st 5-16 Service Class 2.0 Commands DESCRIPTION Transmit phase C data command: releases the DCE to proceed with the negotiation.
  • Page 55 +FNR=rpr, tpr, idr, nsr Negotiation Reporting Enable +FIE=n Procedure Interrupt Parameter +FPS=n Page Transfer Status User's Guide for ZyXEL Omni 56K USB Modem st=0:0 ms st=1:5 ms st=2:10 ms (normal); 5 ms (fine) st=3:10 ms st=4:20 ms (normal); 10 ms...
  • Page 56 User's Guide for ZyXEL Omni 56K USB Modem +FLO=n +FPR=n +FBO=n +FEA=n +FCR=n +FCQ=<rq>, <tq> +FRQ=pql, cbl +FAA=n +FCT=n +FMS=n 5-18 Flow Control Select Serial Port Rate Control Phase C Data Bit Order Phase C Received EOL (End-Of- Line) alignment...

  • Page 57: Voice At Commands

    +VGT Set the gain 0 to 255 for the transmitted voice sample User's Guide for ZyXEL Omni 56K USB Modem Buffer Size Table 21. Voice AT Commands OPTION DEFAULT 0: No flow control. 1: (XON/XOFF) Software flow control.
  • Page 58 User's Guide for ZyXEL Omni 56K USB Modem +VLS Select a voice 0, 1, 2 I/O device +VRA Ring back 0 to 255 goes away timer +VRN Ring back 0 to 255 never come timer +VTX Voice transmit mode +VSD...

  • Page 59: Voice Shielded Dte Commands

    <DLE>f <DLE>h <DLE>q <DLE>s <DLE>H <DLE>u <DLE><ETX> User's Guide for ZyXEL Omni 56K USB Modem Unit: 0.01 second. Unit: 0.1 second. Voice Shielded DTE Commands DESCRIPTION Pause: suspend voice data to the output device in playback state. Resume: resume suspended voice data in playback state.

  • Page 60: S-Register Descriptions

    User's Guide for ZyXEL Omni 56K USB Modem S-Register Descriptions In most bit-mapped S-registers, the default bit value is 0. Non-0 default values are followed by an asterisk. In some cases, default values are shown in the reference column preceded by +.
  • Page 61 1-46 1-2E Enable baud rate to be fixed when answering. Speed S19= 0-99 0-63 Setting value as 'AT&Nn' command. S20= User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION stands for ZyXEL connection). Bit-mapped register: Grant Remote Digital Loop-back test request.
  • Page 62 User's Guide for ZyXEL Omni 56K USB Modem COMMAND NOTE: Only speeds up to S20=15 are supported by auto-speed detection. S21= 1-2 0 5-24 FUNCTION AND DESCRIPTION 76800 bps 57600 bps 38400 bps 19200 bps 16800 bps 14400 bps 12000 bps...
  • Page 63 3-5 0 S24= 6-4 16- 10-70 Speaker volume control, increments of 16 in decimal User's Guide for ZyXEL Omni 56K USB Modem FUNCTION AND DESCRIPTION DSR is always ON. (Default) According to CCITT. (See also S44.4, S41.5). CD is always ON.
  • Page 64 User's Guide for ZyXEL Omni 56K USB Modem S25= 0 to 0-FF Specify the time delay that DTR signal needs to be S26= 0 to 0-FF Set the delay, in 10 millisecond units between the S27= 3-5 0 S28= 2-3 0...
  • Page 65 S36= S38= S39= S40= S41= User's Guide for ZyXEL Omni 56K USB Modem Disable aborting from terminal during modem handshaking. Add 16dB attenuation to the leased line transmission power. Enable Selective Reject in V.42. (Default) Enable extended numerical result codes from 50 to 65 when an error corrected connection is made.
  • Page 66 User's Guide for ZyXEL Omni 56K USB Modem S42= S43= S44= S45= 0-255 0-FF S46= 0 to 0-FF To process the CND, silence must be detected for S48= 5-28 on-off transition. Force S0>=2; does not answer on the first ring.
  • Page 67 NOTE: 'AT' is omitted when an AT command is referred to in the 'Reference' column. User's Guide for ZyXEL Omni 56K USB Modem causes the modem to hang-up and reset to profile 0. When the modem is idle (waiting for command), it does not dial any number when DTR changes from ON to OFF.

  • Page 69: Chapter 6 Firmware Upgrade

    The ZyXEL Omni 56K USB provides a firmware upgrade function either by upgrading the software provided in the CD-ROM disc that came with your modem package, or by using a terminal program such as Bitware or Hyperterminal. To obtain the latest firmware version, please go to ZyXEL's website at http://www.zyxel.com.

  • Page 70: Upgrading By Using A Terminal Program

    User's Guide for ZyXEL Omni 56K USB Modem 6.1.2 Upgrading by Using a Terminal Program To upgrade the firmware by using a terminal program, such as Bitware or HyperTerminal in Windows®, perform the following instructions. For more information on installing Bitware on your computer, please refer to the Read Me First that came with your modem package.

  • Page 71: Glossary

    The carrier is a modulated tone and is used by the modem to transfer the data. Comité Consultatif International Thonique et Traphique; former name for the ITU-TSS CCITT (ITU-T), the international standard making organization for telecommunications. See DCD. User's Guide for ZyXEL Omni 56K USB Modem command to a modem, you must have Glossary...
  • Page 72 User's Guide for ZyXEL Omni 56K USB Modem Call Detail Record. This is a name used by telephone companies for call-related information. Cipher Text Text that has been scrambled or encrypted so that it cannot be read without deciphering it.
  • Page 73 Digital Subscriber Line connections and puts the signals on a high-speed backbone line using multiplexing techniques. Depending on the product, DSLAM multiplexers connect DSL User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 74 User's Guide for ZyXEL Omni 56K USB Modem lines with some combination of asynchronous transfer mode (ATM), frame relay, or IP networks. Data Set Ready – a control signal line of the RS-232C standard. Originally, the DTE (data terminal equipment) meant a dumb terminal or printer, but today it is a computer, or a bridge or router that interconnects local area networks.
  • Page 75 (Lower case i) Any time you connect 2 or more networks together, you have an internet. (Upper case I) The vast collection of inter-connected networks that all use the TCP/IP Internet protocols and that evolved from the ARPANET of the late 60’s and early 70’s. The Internet User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 76 User's Guide for ZyXEL Omni 56K USB Modem now (July 1995) connects roughly 60,000 independent networks into a vast global internet. Interrupt In a computer, some tasks must be performed regularly and without delay. This is possible because the CPUs provide special interrupt vectors. These vectors each point to some short program sequence.
  • Page 77 A method to check whether a character has been correctly transmitted in asynchronous transfer. Usual settings are even parity and odd parity. In a connection, the modems at both ends must use the same parity settings. User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 78 User's Guide for ZyXEL Omni 56K USB Modem 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 if an uneven number of data bit is sent in the character, resulting in an even number of set bits.
  • Page 79 Because of their location, routers are a good place to install traffic or mail filters. Routers are also prone to attacks because they contain a great deal of information about a network. Abbreviation of recommended standard. User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 80 User's Guide for ZyXEL Omni 56K USB Modem See CTS/RTS. RTS/CTS Line for the received data on a serial port following RS-232C. Server A computer, or a software package, that provides a specific kind of service to client software running on other computers.
  • Page 81 Just about any long-distance communication medium can serve as a WAN link, including switched and permanent telephone circuits, terrestrial radio systems, and satellite systems. Warez A term that describes Pirated Software on the Internet. Warez include cracked games or User's Guide for ZyXEL Omni 56K USB Modem...
  • Page 82 User's Guide for ZyXEL Omni 56K USB Modem other programs that software pirates distribute on the Internet. Western Jack Telephone wall outlet connector used in the USA and other countries. (World Wide Web) – Frequently used when referring to "The Internet", WWW has two major meanings –...
  • Page 83 ITU-T T.30 fax protocol ... 3-13 Fax Physical Layer ... 3-3 Fax Physical Layer Protocol ... 3-13 Firmware Specification... 3-2 User's Guide for ZyXEL Omni 56K USB Modem Flash EPROM... Flow Control... 3-5 Front Panel LEDs... 2-1 Hardware CTS/RTS Flow Control ... 3-5 Hardware Specification ...

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