ZyXEL U-336E PLUS User Guide

U-336E Plus

User’s Guide

Version 1.0

ZyXEL

U-336E Plus Data/Fax Modem

TOTAL INTERNET ACCESS SOLUTION

U-336E Plus Data/ Fax Modem

Copyright

Copyright © 1999 by ZyXEL

The contents of this book may not be reproduced (in any part or as a whole) or transmitted in any form or by any means

without the written permission of the publisher.

Published by ZyXEL Communications Corporation. All rights reserved.

Disclaimer

ZyXEL does not assume any liability arising out of the application or use of any products, or software described herein.

Neither does it convey any license under its patent rights nor the patents rights of others. ZyXEL further reserves the right

to make changes in any products described herein without notice. This document is subject to change without notice.

Trademarks

Trademarks mentioned in this manual are used for informational purposes only and they may be properties of their

respective owners.

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U-336E Plus Data/Fax Modem

iii

U-336E Plus Data/Fax Modem

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 warranty period, and upon proof

of purchase, should the product have indications of failure due to faulty workmanship and/or materials, ZyXEL will, at its

discretion, repair or replace the defective products or components without charge for either parts or labor, and to

whatever extent it shall deem necessary to restore the product or components to proper operating condition. Any

replacement will consist of a new or re-manufactured functionally equivalent product of equal value, and will be solely at

the discretion of ZyXEL. This warranty shall not apply if the product is modified, misused, tampered with, damaged by

an act of God, or subjected to abnormal working conditions.

Note

Repair or replacement, 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 of character to

the purchaser.

To obtain the services of this warranty, contact ZyXEL's Service Center; refer to the separate Warranty 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 purchase or those with an out-dated warranty will

be repaired or replaced (at the discretion of ZyXEL) and the customer will be billed for parts and labor. All repaired or

replaced products will be shipped by ZyXEL to the corresponding return address, Postage Paid (USA and territories only).

If the customer desires some other return destination beyond the U.S. borders, the customer shall bear the cost of the

return shipment. This warranty gives you specific legal rights, and you may also have other rights that vary from state to

state.

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U-336E Plus Data/Fax Modem

Customer Support

If you have questions about your ZyXEL product or desire assistance, contact ZyXEL Communications Corporation

offices worldwide, in one of the following ways:

Method International North America Scandinavia

E-Mail-Tech
Support

E-Mail-Sales [e-mail]

Web Site www.zyxel.com www.zyxel.com www.zyxel.dk

Phone

Fax

FTP ­Software and
ROM
upgrades

Regular Mail

[e-mail]

[e-mail]

(Europe)

[phone] [phone]

[phone] [phone] [phone]

ftp.europe.zyxel.com ftp.zyxel.com ftp.zyxel.dk

ZyXEL Communications Corp., 6
Innovation Road II, Science­Based Industrial Park, Hsinchu,
Taiwan 300, R.O.C.

[e-mail] [e-mail]

[e-mail] [e-mail]

[phone]

800-255-4101

ZyXEL Communications
Inc., 1650 Miraloma
Avenue, Placentia, CA
92870, U.S.A.

ZyXEL Communications A/S,
Columbusvej 5, 2860
Soeborg, Copenhagen,
Denmark

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U-336E Plus Data/Fax Modem

Table of Contents

Declaration of Conformity..iii

Customer Support ............................................................................................................................v

Table of Contents.............................................................................................................................vi

List of Figures ................................................................................................................................xiii

List of Tables..................................................................................................................................xiv

Preface ...........................................................................................................................................xvii

Chapter 1 ........................................................................................................................................1-1

Getting to Know Your Modem ......................................................................................................1-1

1.1 U-336E Plus Data/Fax Modem............................................................................................1-1

1.2 Standard Features ...............................................................................................................1-1

1.3 Intelligent Features .............................................................................................................1-2

1.4 Data Compatibility................................................................................................................1-3

1.5 Fax Compatibility .................................................................................................................1-4

1.6 Technical Specifications.......................................................................................................1-4

1.7 Applications..........................................................................................................................1-5

1.7.1 Data Transfer Via Leased Line....................................................................................1-5

1.7.2 Synchronous mode DTE..............................................................................................1-6

1.7.3 Internet Access ............................................................................................................1-6

Chapter 2 ........................................................................................................................................2-1

Modem Installation ........................................................................................................................2-1

2.1 Front Panel ..........................................................................................................................2-1

2.1.1 Front Panel LEDs ........................................................................................................2-2

2.1.2 Front Panel Switches ...................................................................................................2-2

2.2 Rear Panel...........................................................................................................................2-3

vi

U-336E Plus Data/Fax Modem

2.3 Additional Installation Requirements ...................................................................................2-4

2.4 Connecting the Modem .......................................................................................................2-5

2.5 Modem Configuration ..........................................................................................................2-5

2.6 Power On.............................................................................................................................2-6

Chapter 3 ........................................................................................................................................3-1

Setting up your Internet Connection ...........................................................................................3-1

3.1 Installing TCP/IP..................................................................................................................3-1

3.2 Configuring TCP/IP..............................................................................................................3-2

3.3 Creating a Dial-up Connection ............................................................................................3-4

Chapter 4 ........................................................................................................................................4-1

Basic Modem Operation ...............................................................................................................4-1

4.1 Understanding AT Commands.............................................................................................4-1

4.1.1 Using the Windows 95 Hyper Terminal Program .......................................................4-1

4.2 Dialing and Answering Techniques......................................................................................4-3

4.2.1 Dialing using the ATD Command............................................................................... 4-3

4.2.2 Auto-Answer and Hook Controls ................................................................................4-4

4.3 Quick Tips when issuing AT Commands .............................................................................4-4

4.3.1 Modem Result Codes ..................................................................................................4-6

4.3.2 Viewing S Register Values.......................................................................................... 4-7

4.3.3 Changing S Register Values........................................................................................4-7

4.4 Non-Volatile Memory ...........................................................................................................4-8

4.4.1 Storing Phone Numbers............................................................................................... 4-8

4.4.2 Dialing Stored Phone Numbers ...................................................................................4-8

4.4.3 Saving Settings and User Profiles ...............................................................................4-9

4.5 Helpful Hints for PC Computers ..........................................................................................4-9

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U-336E Plus Data/Fax Modem

4.5.1 Default Modem Settings for PC’s..............................................................................4-10

4.6 Helpful Hints for Mac Computers.......................................................................................4-11

4.6.1 Special AT Command Settings for Mac ....................................................................4-11

4.6.2 Mac Serial Port ..........................................................................................................4-11

4.6.3 Mac Software Tips.....................................................................................................4-11

4.7 Helpful Hints for UNIX-Based Computers..........................................................................4-12

4.7.1 Serial Cable................................................................................................................4-12

4.7.2 Basic Modem Settings for UNIX ..............................................................................4-12

4.7.3 Unix Software Tips....................................................................................................4-12

Chapter 5 ........................................................................................................................................5-1

AT Command Set Summary..........................................................................................................5-1

5.1 Basic AT Command Set.......................................................................................................5-1

5.1.1 Result Code Options ....................................................................................................5-4

5.2 Extended AT& Command Set ..............................................................................................5-7

5.3 Extended AT* Command Set .............................................................................................5-14

5.4 Extended AT# Command Set ............................................................................................5-17

5.5 AT Fax Command Set........................................................................................................5-17

5.6 AT Voice Command Set.....................................................................................................5-17

Chapter 6 ........................................................................................................................................6-1

Status Registers.............................................................................................................................6-1

6.1 S-Register Descriptions .......................................................................................................6-1

6.1.1 Basic S-Registers "ATSn=x" .......................................................................................6-1

6.1.2 Extended S-Registers "ATSn=x".................................................................................6-2

Chapter 7 ........................................................................................................................................7-1

Leased Line Operation ..................................................................................................................7-1

viii

U-336E Plus Data/Fax Modem

7.1 Connecting to a Leased Line...............................................................................................7-1

7.1.1 Line Type Setting ........................................................................................................7-1

7.1.2 Power Level Setting ....................................................................................................7-1

7.2 Leased Line Handshaking...................................................................................................7-2

7.2.1 Manual Connect ..........................................................................................................7-2

7.2.2 Auto Handshake ..........................................................................................................7-2

7.3 Terminating a Leased Line Connection ...............................................................................7-3

Chapter 8 ........................................................................................................................................8-1

Synchronous Mode Operation .....................................................................................................8-1

8.1 Mode options .......................................................................................................................8-1

8.2 Clock Options ......................................................................................................................8-2

8.3 Half-Duplex operation..........................................................................................................8-2

8.3.1 Pseudo CD...................................................................................................................8-3

8.3.2 V.13 .............................................................................................................................8-3

Chapter 9 ........................................................................................................................................9-1

Error Control and Data Compression..........................................................................................9-1

9.1 Error Control ........................................................................................................................9-1

9.2 Data Compression...............................................................................................................9-2

9.3 Flow Control.........................................................................................................................9-3

9.3.1 Hardware CTS/RTS Flow Control .............................................................................. 9-3

9.3.2 Software XON/XOFF Flow Control ...........................................................................9-3

Chapter 10 ....................................................................................................................................10-1

Special Functions........................................................................................................................10-1

10.1 Security Functions .........................................................................................................10-1

10.1.1 Levels of Security..................................................................................................10-1

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U-336E Plus Data/Fax Modem

10.1.2 User Passwords......................................................................................................10-2

10.2 Remote Configuration....................................................................................................10-3

10.3 Caller Number Delivery (Caller ID) ................................................................................10-5

10.4 Distinctive Ring ..............................................................................................................10-7

10.5 Extended Distinctive Ring (EDR)...................................................................................10-9

10.5.1 Setting Up EDR ...................................................................................................10-10

10.5.2 EDR Application Example ..................................................................................10-11

10.6 On-line Help .................................................................................................................10-12

10.7 V.25bis Command Set .................................................................................................10-12

Chapter 11.....................................................................................................................................11-1

Fax Operation...............................................................................................................................11-1

11.1 Fax Basics .....................................................................................................................11-1

11.2 Modem as Fax Machine ................................................................................................11-2

11.2.1 ITU-T T.30 Fax Protocol.......................................................................................11-2

11.3 Fax Command sets........................................................................................................11-2

11.3.1 Defining the Fax Command Sets ...........................................................................11-3

11.3.2 Service Class 1 Commands ...................................................................................11-3

11.3.3 Service Class 2.0 Commands ................................................................................11-4

11.4 Status Report Result Codes ..........................................................................................11-9

Chapter 12 ....................................................................................................................................12-1

Voice Capability ...........................................................................................................................12-1

12.1 The voice AT command specification ............................................................................12-1

12.2 Voice Shield DTE command ..........................................................................................12-2

Chapter 13 ....................................................................................................................................13-1

Diagnostics...................................................................................................................................13-1

13.1 Power-on Self-test .........................................................................................................13-1

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U-336E Plus Data/Fax Modem

13.2 Loopback Tests..............................................................................................................13-2

13.2.1 Analog Loopback Test (AT&T1) ..........................................................................13-2

13.2.2 Analog Loopback with Self-test (AT&T8) ...........................................................13-2

13.2.3 Local Digital Loopback Test (AT&T3).................................................................13-2

13.2.4 Remote Digital Loopback Test (AT&T6) .............................................................13-3

13.2.5 Remote Digital Loopback with Self-test (AT&T7)...............................................13-3

13.3 Line Condition Report (AT#E1)......................................................................................13-3

13.4 Link Status Report (ATI2)...............................................................................................13-4

Indicator Lights ..........................................................................................................................13-7

13.4.1 Retransmission Indicator .......................................................................................13-7

13.4.2 Dialing Indicator.................................................................................................... 13-7

13.4.3 Handshaking And Retrain Indicator ......................................................................13-7

Chapter 14 ....................................................................................................................................14-1

Upgrading Your Modem ..............................................................................................................14-1

14.1 Upgrading by Flash EPROM .........................................................................................14-1

14.2 Kernel Recovery Mode ..................................................................................................14-2

Chapter 15 ....................................................................................................................................15-1

Troubleshooting ..........................................................................................................................15-1

15.1 AT Command Set Problems ..........................................................................................15-1

15.2 Command Echo Problems.............................................................................................15-3

15.3 Auto-Answer Problems..................................................................................................15-3

15.4 Dialing Problems............................................................................................................15-4

15.5 Data Transfer Problems.................................................................................................15-5

15.6 Connection Problems ....................................................................................................15-5

Appendix A....................................................................................................................................... A

xi

U-336E Plus Data/Fax Modem

Glossary............................................................................................................................................ A

Appendix B.........................................................................................................................................I

EIA-232D Interface .............................................................................................................................I

Appendix C........................................................................................................................................J

Phone Jack Pin Assignments..........................................................................................................J

Index.................................................................................................................................................. K

xii

U-336E Plus Data/Fax Modem

List of Figures

Figure 2-1 Front Panel ................................................................................................................................... 2-1

Figure 2-2 Rear Panel .................................................................................................................................... 2-3

Figure 3-1 Select Network Component Type................................................................................................. 3-1

Figure 3-2 Select Network Protocol............................................................................................................... 3-2

Figure 3-3 Network........................................................................................................................................ 3-3

Figure 3-4 IP Address..................................................................................................................................... 3-3

Figure 3-5 DNS Configuration....................................................................................................................... 3-4

Figure 3-6 Make New Connection................................................................................................................. 3-5

Figure 3-7 Insert ISP’s Phone Number .......................................................................................................... 3-5

Figure 3-8 Completing Dial-Up Connection.................................................................................................. 3-6

xiii

U-336E Plus Data/Fax Modem

List of Tables

Table 1-1U-336E Plus Data Operation Modes................................................................................................1-3

Table 1-2 Fax Compatibility ..........................................................................................................................1-4

Table 2-1 LED Indicators ...............................................................................................................................2-2

Table 2-2 Front Panel Switches ......................................................................................................................2-3

Table 2-3 Rear Panel.......................................................................................................................................2-4

Table 4-1 Modem Settings..............................................................................................................................4-2

Table 4-2 AT Result Codes .............................................................................................................................4-5

Table 4-3 Basic Commands ............................................................................................................................4-5

Table 4-4 AT Command Sets/Types................................................................................................................4-6

Table 4-5 Profile Setting Commands..............................................................................................................4-9

Table 4-6 Default Settings ............................................................................................................................4-10

Table 5-1 Basic AT Command Set..................................................................................................................5-1

Table 5-2 Result Code Options.......................................................................................................................5-4

Table 5-3 Extended AT& Command Set.........................................................................................................5-7

Table 5-4 Extended AT* Command Set........................................................................................................5-14

Table 5-5 Extended AT# Command Set........................................................................................................5-17

Table 6-1 Basic S-Registers............................................................................................................................6-1

Table 6-2 Extended S-Registers......................................................................................................................6-2

Table 7-1 AT Command to Set Line Type.......................................................................................................7-1

Table 7-2 AT Command to Set Power Level...................................................................................................7-1

Table 7-3 AT Command for Auto Handshake .................................................................................................7-2

Table 8-1 Synchronous Mode Options............................................................................................................8-1

Table 8-2 Clock Options.................................................................................................................................8-2

Table 9-1 Error Control and Data Compression .............................................................................................9-2

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U-336E Plus Data/Fax Modem

xv

Table 10-1 Security Function Commands.................................................................................................... 10-3

Table 10-2 AT*Rab Command..................................................................................................................... 10-4

Table 10-3 AT*Wab Command .................................................................................................................... 10-4

Table 10-4 Ring Control............................................................................................................................... 10-8

Table 10-5 EDR Settings............................................................................................................................ 10-10

Table 10-6 V.25 Command Set................................................................................................................... 10-12

Table 11-1 Service Class 1 Commands .........................................................................................................11-3

Table 11-2 MOD Parameters.........................................................................................................................11-4

Table 11-3 Service Class 2.0 Commands ......................................................................................................11-4

Table 11-4 Status Report Result Codes .........................................................................................................11-9

Table 12-1 Voice AT Commands.................................................................................................................. 12-1

Table 12-2 Voice Shield DTE Command..................................................................................................... 12-2

Table 13-1 Data Type Description................................................................................................................ 13-4

Table 13-2 Output Value Description........................................................................................................... 13-4

U-336E Plus Data/Fax Modem

Preface

About Your Modem

Congratulations on the purchase of yourU-336E Plus modem - one of ZyXEL's premier high­performance products. TheU-336E Plus modem is world renown for its ability to maintain ultra
high speeds and clear, quality connections while communicating around the globe.

About This Manual

This manual describes the use of yourU-336E Plus data/fax modem and gives instruction for its
installation and operation.

Structure of this Guide

This manual is divided into four sections:

• Getting Started (Chapters 1-4) gives a basic overview of your modem’s features, explains its

installation procedures and introduces you to the basic commands and techniques involved in
modem operation.

• Settings and Commands (Chapters 5-6) provides an overview of the settings and commands

which are available in theU-336E Plus modem.

• Additional Functions (Chapters 7-13) describes many special functions and features of theU-

336E Plus modem in detail, including error control and data compression, leased-line and
synchronous mode operation, remote configuration, caller ID, fax sending and receiving, voice
mail and diagnostic features.

• Upgrading and Troubleshooting (Chapters 14-15) provides information about upgrading your

modem and solving common problems.

Becoming a Registered Owner

xvii

U-336E Plus Data/Fax Modem

Complete the pre-addressed Warranty Registration Card and place it in the mail. Registered owners
will receive future product information and update announcements. Warranty registration is not
necessary for product repair/or replacement. Save your dated invoice as proof of purchase.

xviii

U-336E Plus Data/Fax Modem

Chapter 1

Getting to Know Your Modem

This chapter describes the key features and applications of your 56/33.6 Kbps Data/Fax modem.

1.1 U-336E Plus Data/Fax Modem

The U- 336E Plus is an analog Data/Fax modem used for data transmission via PSTN line. It
connects to both 2-wire dial-up and 2-wire leased line. The synchronous transmission mode can
support up to 33.6kbps. For Internet access application, it operates with downstream maximum
speed of up to 56Kbps and upstream speed of up to 33.6Kbps. The speed depends on the line
quality, and server side configuration.

1.2 Standard Features

• ITU V.90 56Kbps down-stream data transmission.

• V.34bis 33.6Kbps data transmission rate.

• Operates in all system environments including Windows 95, DOS, Windows, Macintosh, OS/2,

UNIX, Novell, Amiga, and IBM AS400/RS6000 and other synchronous mode DTE.

• Microsoft Windows 95/98/NT plug and play compatible.

• V.42 and MNP 4/3 error control.

Getting to know your Modem

1-1

U-336E Plus Data/Fax Modem

• V.42bis and MNP 5 data compression.

• DTE serial interface with speeds up to 460.8Kbps.

• 12 LED indicators.

• Extended AT command set.

• V.25bis command set..

• Operates on 2-wire dial-up or 2-wire leased line.

• On-line help for easy command reference.

1.3 Intelligent Features

• Automatic data and voice call detection allows you to use a single telephone line to handle both

types of calls.

• Asynchronous and synchronous modes for reliable serial data communication. Up to 33.6 Kbps

for synchronous transmission.

• Fast retrain with automatic fall-forward and fall-back. Your modem will automatically fall

back to lower speeds when communicating with slower modems and when encountering
unstable or variable line conditions.

• Call-back security and password protection restricts access to 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 modem to identify callers).

• Distinctive ring detects data and voice calls (this feature requires communication software that

supports distinctive ring, such as ZFAX).

1-2 Getting to know your Modem

U-336E Plus Data/Fax Modem

• Remote configuration capability.

• EDR (extended Distinctive Ring).

• Flash EPROM memory lets you easily upload new firmware, providing you with easy access to

new features.

• ZyXEL exclusive Kernel Recovery Mode for no hassle recovery from failed flash uploads - no

factory repairs needed.

• Reduced voice function. Supports DTMF tone generation and detection only.

1.4 Data Compatibility

TheU-336E Plus modem is a high performance universal modem capable of transmission speed up
to 56/33.6 Kbps full-duplex on a 2-wire dial-up line. Universal compatibility covers a broad range
of ITU-T and BELL standards.

Various operation modes that can be achieved are as follows:

Table 1-1U-336E Plus Data Operation Modes

Standard Bit Rate [bps] Baud Rate

[baud]

V.90 28000-56000 8000 PCM

V.34bis/V.34 33600-2400 multiple TCM multiple

V.32bis 14400 2400 128-TCM 1800

V.32bis 12000 2400 64-TCM 1800

V.32bis 7200 2400 16-TCM 1800

V.32 9600 2400 32-TCM 1800

V.32
uncoded

V.32 4800 2400 4-DPSK 1800

Getting to know your Modem

9600 2400 16-QAM 1800

Modulation Carrier Frequency

[Hz]

1-3

U-336E Plus Data/Fax Modem

V.23 1200/75 1200/75 FSK

V.23 600/75 600/75 FSK

V.22bis 2400 600 16-QAM 1200 Org

2400 Ans

V.22

(BELL 212A)

V.21 300 300 FSK

BELL 103 300 300 FSK

1200 600 4-DPSK 1200 Org

2400 Ans

1.5 Fax Compatibility

TheU-336E Plus modem supports fax applications and is compatible with many fax transmission
standards. It provides the highest fax speed of up to 14400 bps using the fax transmission standard
V.17.

Table 1-2 Fax Compatibility

Standard Bit Rate [bps] Baud Rate [baud] Modulation Carrier Frequency [Hz]

V.17 14400-7200 2400 TCM 1800

V.29 9600-4800 2400 QAM/DPSK 1700

V.27ter 4800-2400 1600/1200 PSK/DPSK 1800

V.21 300 300 FSK

1.6 Technical Specifications

• Operating mode: auto-dial/answer.

• Flow control: software XON/XOFF or hardware CTS/RTS.

1-4 Getting to know your Modem

U-336E Plus Data/Fax Modem

• Data/Voice 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: programmable volume control.

1.7 Applications

1.7.1 Data Transfer Via Leased Line

YourU-336E Plus modem provides reliable transmission quality on-line data transfer for users
subscribing a leased line. It is useful for networks that have traffic requirements with steady and
sustained patterns, such as large file transfers. Your modem is a cost-effective way to handle a
high volume of data and/or voice traffic.

Leased lines are very popular method of connecting corporate sites. They are essentially private
reserved pathways (or pipelines). The private nature of the leased line networks provides inherent
privacy and control benefits. Digital leased lines provide good line quality. For more information
please read the chapter Leased Line Operation

Getting to know your Modem

1-5

U-336E Plus Data/Fax Modem

1.7.2 Synchronous mode DTE

YourU-336E Plus modem provides service on an immediate basis and ensures a steady flow of data.
It is very useful for users using synchronous mode DTE like IBM mainframes.

To process large amount of information, you can use theU-336E Plus to transmit data to remote
synchronous DTEs with speed of up to 33.6Kbps. For more information please read the chapter

Synchronous Mode Operation.

1.7.3 Internet Access

YourU-336E Plus modem supporting the V.90 protocol is the ideal choice for high-speed access to
the Internet.

V.90 technology is ideal for Internet users, because it enables fast downloading of Web pages with
sound, video and other large files.

Your modem is compatible with ISP servers having modem chipsets manufactured by major
vendors such as Rockwell, Lucent and U.S Robotics.

For more information on setting up your modem for Internet connection refer to the chapter Setting
up your Internet Connection.

1-6 Getting to know your Modem

U-336E Plus Data/Fax Modem

ZyXEL

Chapter 2

Modem Installation

This chapter describes the panel function and installation procedure for the U-336E PLUS.

A shielded RS-232 cable is required to ensure compliance with FCC Part 15, and it is your
responsibility to use a shielded RS-232 cable. Make sure your installation site is clean and well
ventilated. The ventilation slot of your ZyXEL modem located on the sides and bottom should not
be covered to allow for free movement of air.

2.1 Front Panel

The LEDS on the front panel indicate the operational status of the modem. Figure 2.1 shows the
front panel of theU-336E Plus. There are 12 LED indicators and two key switches.

H S

H SH S

A AA A

C DC D

O HO H

O HC D

C DAA

A AH S

Modem Installation

D TRO H

D TRD TR

V 90 / V 34 / FAX

V 90 / V 34 / FAX

V 90 / V 34 / FAX V 90 / V 34 / FAX

C TS RTS

D SRD TR

C TSC TS

D SRD SR

Figure 2-1 Front Panel

RTSD SR

RTSRTS

TX D R XD

RXDC TS

TX DTX D

RXDRXD

SQ

SQ TST

TSTTX D

SQSQ

TSTTST

Plus

A /O

A /O

A /OA /O

/

D /V

D /V

D /VD /V

2-1

U-336E Plus Data/Fax Modem

2.1.1 Front Panel LEDs

The following table describes the LED indicators.

Table 2-1 LED Indicators

LEDs Description

HS High Speed mode indicator, lights ON when your modem is operating in V.34 or V.90

mode; flashes when your modem is in Handshaking State.

AA Auto-Answer indicator lights ON when your modem is in the Auto Answer Mode; and

Flashes when modem rings. In error control mode, it flashes when retransmitting.

CD Carrier Detect indicator, lights ON when a valid carrier is detected present on the line.

OH Off-Hook indicator lights ON when your modem is in data mode or off-hook and lights

OFF when your modem is in talk mode or on-hook.

DTR Data Terminal Ready indicator, lights ON when your DTE or computer indicates that it

is ready to begin communication and lights OFF when DTE is not ready to transmit
data.

DSR DTE mode. Data Set Ready Indicator, lights ON when the modem is ready for

communication and lights OFF when the modem is not ready.

CTS DTE mode. Clear To Send indicator, lights ON 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 when your DTE/computer transmits data on the serial port.

RXD Receive indicator, ON when your DTE/computer receives data on the serial port.

SQ Signal Quality Indicator, ON when signal quality is good, OFF when signal quality is

bad, and flashes when signal quality is marginal or during power up to indicate an
error condition.

TST Test indicator, ON when modem is in the test mode.

2.1.2 Front Panel Switches

The following table describes the Front Panel Switches:

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U-336E Plus Data/Fax Modem

Table 2-2 Front Panel Switches

Switches Description

A/O Pressing the button will set the modem in originate mode and releasing it in answer

mode.

This switch only determines modem operation if the modem is made to go off-hook
manually. Or else the ATD or ATA command will automatically determine the
mode.

D/V Switches the modem into data mode or voice mode. (the telephone is connected to

the line).

Warning: If the A/O switch is pressed while the modem is being turned on; the modem will jump
into a special kernel program that allows you to upload new firmware into the modem from a
computer. If this is not what you intended, turn off the modem and then turn it on again to return to
normal operation.

2.2 Rear Panel

TheU-336E Plus rear panel is shown below:

Figure 2-2 Rear Panel

Modem Installation

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U-336E Plus Data/Fax Modem

Table 2-3 Rear Panel

Printed on

U-90E Housing

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 connection to a telephone set. Pin assignments for RJ-11 phone

DTE/EIA 232D Serial port DB25F connector, for connection to the serial port of a DTE (computer

Description

jacks are listed in the Appendix.

terminal). Pin assignments of the DTE are listed in the Appendix.

2.3 Additional Installation Requirements

• 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, and 22).

• Available telephone jack.

• Available AC wall outlet.

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Modem Installation

U-336E Plus Data/Fax Modem

• Telephone line from your telephone company (dial-up or leased line).

• Data and fax communication software.

2.4 Connecting the Modem

Connect the power plug from the adapter to the power jack and plug the other end into an electrical
outlet. When you connect your modem to the power line, make sure you only use the power
adapter that is 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.

Turn off the power on both the computer and the modem before making connections. Then connect
the modem according to the rear panel labels.

Note: Before using RS-232 to connect your modem to your PC, please find the COM port on the
back of your PC to determine the pin type of the required connector.

2.5 Modem Configuration

There are no DIP (dual in-line package) switches or configuration settings that you need to worry
about. Your modem is factory pre-set. User configurations are also conveniently stored in user

selectable non-volatile memories and can be recalled as often as needed by using ATZn command.

Modem Installation

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U-336E Plus Data/Fax Modem

2.6 Power On

Once your modem’s power switch is turned ON, a series of diagnostic tests will be performed. For
a more detailed description of these diagnostic tests, please refer to the chapter on Diagnostics and
Troubleshooting. After performing the diagnostic tests, your modem is ready for use.

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Modem Installation