ZyXEL U-336S, U-336SA User Guide

U-336S and U-336SA

User’s Manual

Version 3.0

ZyXEL

TOTAL INTERNET ACCESS SOLUTION

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 re­manufactured 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 or character to the purchaser.

ii

To obtain the services of this warranty, please 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 which vary
from state to state.

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.
Note: 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.

Acknowledgments

Trademarks mentioned in this manual are used for informational
purposes only.

Trademarks are properties of their respective owners.

FCC Part 15 Information

This device complies with Part 15 of FCC rules. Operation is subject to
the following two conditions:

1. This device may not cause harmful interference.

2. This device must accept any interference received, including
interference that may cause undesired operations.

This equipment has been tested and found to comply with the limits for
a CLASS A digital device pursuant to Part 15 of the FCC Rules. These

iii

limits are designed to provide reasonable protection against harmful
interference in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy, and if not installed and
used in accordance with the instructions, may cause harmful interference
to radio communications.

If this equipment does cause harmful interference to radio/television
reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or
more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet on a circuit different from that

to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment. Shielded RS-232 cables are required to be used to
ensure compliance with FCC Part 15, and it is the responsibility of the
user to provide and use shielded RS-232 cables.

iv

Information for Canadi an Users

The Industry Canada label identifies certified equipment. This
certification means that the equipment meets certain telecommunications
network protective, operation, and safety requirements. The Industry
Canada does not guarantee that the equipment will operate to a user’s
satisfaction.

Before installing this equipment, users should ensure that it is permissible
to be connected to the facilities of the local telecommunications

company. The equipment must also be installed using an acceptable
method of connection. In some cases, the company’s inside wiring
associated with a single line individual service may be extended by
means of a certified connector assembly. The customer should be
aware that the compliance with the above conditions may not prevent
degradation of service in some situations.

Repairs to certified equipment should be made by an authorized
Canadian maintenance facility designated by the supplier. Any repairs or
alterations made by the user to this equipment, or equipment
malfunctions, may give the telecommunications company cause to
request the user to disconnect the equipment.

For their own protection, users should ensure that the electrical ground
connections of the power utility, telephone lines, and internal metallic
water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.

Caution: Users should not attempt to make such connections
themselves, but should contact the appropriate electrical
inspection authority, or electrician, as appropriate.

This digital apparatus does not exceed the class A limits for radio noise
emissions from digital apparatus set out in the radio interference
regulations of Industry Canada.

The declarations of CE marking:

Note: This applies only for U-336S model.

v

This product has been approved for connection to the Public Switched
Telecommunication Network using interfaces compatible with ITU-TSS
recommendation I.420 (Basic Rate ISDN user access). This product
complies with the following directives:

1. The Council Directive 89/336/EEC of 3 May 1992 on the
approximation of the laws of the member states relation to Electro
Magnetic Compatibility. (EMC Directive)

2. Council Directive 91/263/EEC of 29 April 1991 on the
approximation of the laws of the Member States concerning
telecommunication terminal equipment. (The Telecom Terminal
Equipment Directive)

3. 93/68/EEC of 22 July 1993 amending the Directives 89/336/EEC,
91/263 /EEC and 92/31/EEC.(Marking Directive)

The Council Directive 92/31/EEC of 28 April 1992 amending

directive on the approximation of the laws of the member states
relating to EletoMagnetic Compatibility.

Contacting ZyXEL

vi

If you have questions about your ZyXEL product or desire assistance,
contact ZyXEL Communications Corporation in one of the following
ways:

• Phone: In North America call between 8:00 AM and 5:00 PM
PST at [phone]

Outside North America, you can dial [phone] between

8:00AM and 5:00PM Taiwan time (GMT +8:00).

• Fax: ZyXEL in North America: [phone] or Taiwan: +886-
3-5782439

• E-mail:

• Sales inquiries: [e-mail] in North America

[e-mail] outside North America.

• Technical support: [e-mail] in North America.

[e-mail] outside North America.

• Product information: Visit our site on the World Wide Web:
http://www.zyxel.com.

• FTP: Information , such as ZyXEL software and ROM updates for
North America can be found at this FTP address: ftp.zyxel.com

For European versions and related files, use the address:

ftp.zyxel.co.at

• Postal Service: You can send written communications at the
following address:

ZyXEL Communications Corporation
6, Innovation Road II, Science-Based Industrial Park
Hsinchu, Taiwan 300, R.O.C.
or
ZyXEL Communications Inc.
1650 Miraloma Avenue
Placentia, CA92870, U.S.A.

vii

viii

Contents

ZyXEL Limited Warranty ii
FCC Part 15 Information iii
Information for Canadian Users iv
Contacting ZyXEL vi

1 Introduction 1

Required Equipment 1
Modem Features 2

Standard Features 2
Intelligent Features 3
Fax Compatibility 4
Technical Specifications 4

2 Installation 7

Front Panel 7

Front Panel LEDs 8
Front Panel Switches 9
Rear Panel Markings 9

Modem Connection 10
Powering Up 12

3 Basic Modem Operation 13

Understanding AT Commands 13

Using the Windows 95 Hyper Terminal Program 14

Dialing and Answering Techniques 15

Dialing using the ATD Command 15

ix

Auto-Answer and Hook Controls 16

Quick Tips when issuing AT Commands 17

Modem Result Codes 19
Viewing S Register Values 19
Changing S Register Values 20

Non-Volatile Memory 20

Storing Phone Numbers 21
Dialing Stored Phone Numbers 21
Saving Settings and User Profiles 21

Helpful Hints for PC Computers 22

Default Modem Settings for PC’s 23
ZyXEL Serial/Parallel I/O Card 23

Helpful Hints for Mac Computers 24

Special AT Command Settings for Mac 24
Mac Serial Port 24
Mac Software Tips 24

Helpful Hints for UNIX-Based Computers 25

Serial Cable 25
Basic Modem Settings for UNIX 25
Unix Software Tips 26

x

4 LCD Panel Operation 28

LCD Panel 28
Panel Operation 29

Menu Tree 30
LED Status Screen 30
Double Arrows on The Screen 31

Dialing 31

Dial Memory 32
Storing a Number 32
View and Store a Number 33

Dialing a Number 33
Manual Dial 34
Repeat Last Dial 35
Auto Answer 35

Dialing Messages 36
Panel Lock 41
V.25bis Command Set 42
Clock Options 43
RTS Options 44
Command State Options 44
Dialing from Synchronous Mode 44
Answering from Synchronous Mode 45

Auto-Answer 45
Manual Answer 45

5 Leased Line Operation 46

Connecting to a Leased Line 46

Power Level Setting 46

Leased Line Handshaking 46

Manual Connect 47
Auto Handshake 47
Aborting from Leased-Line Operation 47

Terminating a Leased Line Connection 48

6 Special Functions 50

Security Functions 50

Levels of Security 50
User Passwords 51

Remote Configuration 53
Caller Number Delivery (Caller ID) 54
Distinctive Ring 57

xi

Extended Distinctive Ring (EDR) 59

Setting Up EDR 60
EDR Application Example 61

7 Fax Operation 64

Fax Basics 64
Modem as Fax Machine 65

ITU-T T.30 Fax Protocol 65

Fax Command sets 66

Defining the Fax Command Sets 66
Class 1 Command Set 67
Class 2 Command Set 68
Class 2.0 Command Set 74
Extended Fax AT Command Set 81
Flow Control 85

Fax Reception from a BBS 86

8 AT Command Set Summaries 88

Basic AT Command Set 88

Description of ATI2 Output: 91

Extended AT& Command Set 94
Extended AT* Command Set 100

xii

9 Status Registers & Result Codes 105

S-Register Descriptions 105

Basic S-Registers "ATSn=x" 105
Extended S-Registers "ATSn=x" 106

Result Code Options 124

"ATXn" Result Code Option Table 124
Result Code Field Descriptions 126

Connect Strings for Error Corrected Connections 127

10 Diagnostics & Troubleshooting 128

Diagnostics 128

Power-On Self Test 128
Resetting The Modem 129
Loopback Tests 130
Indicator Lights 132
Line Condition Status Display 132

Trouble Shooting 135

AT Command Set Problems 135
Command Echo Problems 136
Answer Problems 137
Dialing Problems 138
Data Transfer Problems 138
Connection Problems 139

11 Upgrading Your Modem 140

Upgrading by Flash EPROM 140
Kernel Recovery Mode 141

12 Connector Pinouts 142

Phone Jack Pinouts 142
PC Serial Port Pinouts 142
Macintosh Serial Port Pinouts 144

13 Index 146

xiii

1 Introduction

Congratulations on the purchase of your U-336S/SA modem - one of
ZyXEL's premier high-performance products. The U-336S and the U­336SA modem are world renown for their ability to maintain ultra high
speeds and clear, quality connections while communicating around the
globe.

This User’s Guide describes the use of both U-336S and U-336SA
models and gives instructions for their installation and operation. All the
features are common to both the models except for different input
terminal. The U-336S modem requires an AC power adapter whereas
the U-336SA can be directly connected to the AC power outlet.

If you do not find information on a specific topic, or if you would like
more information about a topic covered in your User's Manual, please
call ZyXEL Technical Support at 714-693-0808. Other means of
contacting ZyXEL are listed in the Contacting ZyXEL section.

Required Equipment

In addition to the ZyXEL modem you just purchased, you must have
the following equipment to operate your modem:

• Computer terminal.

• Available PC serial port with a high-speed 16550 UART.

• Standard "straight-through” RS-232 cable (pins 1-8, 20, 22).

• Available telephone jack.

Introduction 1

• One AC power adapter (external model) for U336S modem only.

• Available AC wall outlet.

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

line).

• Data and fax communication software.

Modem Features

No other 33.6 Kbps modem gives you so much for so little. Your
modem is equipped with an array of standard and ZyXEL-famous
Intelligent features designed to make your data communications faster,
easier, and more convenient.

Standard Features

• Ultra-high speed modem supports V.34bis for 33,600bps and is
backwards compatible

2 Introduction

• Operates in all environments including: Windows 95, DOS,
Windows, Macintosh, OS/2, UNIX, Novell, Amiga, and IBM
AS400/RS6000.

• V.42 and MNP 4/3 error correction.

• V.42bis and MNP 5 data compression.

• DTE serial interface with speeds up to 460.8Kbps.

• 20 x 2 LCD display.

• 10 LED indicators.

• Exten ded AT command set with V.25bis.

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

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.

• 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)

• Remote configuration capability.

• EDR (extended Distinctive Ring).

• Flash EPROM memory lets you easily upload new firmware,

providing you with easy access to new features.

Introduction 3

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

Fax Compatibility

• EIA Class 1, 2, and 2.0 Fax commands.

• ITU-T V.17 G3: up to 14,400bps.

• ITU-T V.29 G3: up to 9,600bps.

• ITU-T V.27ter G3: up to 4,800bps.

• ZyXEL Fax AT commands.

Technical Specifications

• Operating mode: auto-dial/answer.

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

• Configuration settings: software programmable with non-volatile

memory for phone number/profile storage.

4 Introduction

• 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.

Introduction 5

6 Introduction

2 Installation

This chapter describes the panel function and installation procedure for
the U-336S/SA.

A shielded RS-232 cable is required to ensure compliance with FCC
Part 15, and it is the responsibility of the user to provide and 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 and should allow free
movement of air.

Front Panel

The U-336S and the U-336SA models have 10 LED indicators, a 20 x
2 LCD display, and four key switches. The following figure shows the
front panel of the U-336S.

Figure 2-1 Front Panel

The next figure shows the front panel of the U-336SA modem.

Installation 7

Figure 2-2 U-336SA Front Panel

Front Panel LEDs

PWR Power ON indicator, loghts up when your modem is turned

ON.

OH Off-Hook indicator, lights up when your modem is in data

mode or off-hook. It goes out when your modem is in talk
mode or on-hook.

AA Auto-Answer indicator, lights up when your modem is in the

Auto Answer Mode; flashes when modem rings. In error
control mode, it flashes when retransmitting.

DTR Data Terminal Ready indicator, lights up when your DTE or

computer indicates that it is ready to begin communication.

DSR DTE mode: Data Set Ready Indicator, lights up when the

modem is ready for communication.

TXD Transmit indicator, ON when your DTE/computer transmits

data on the serial port.

8 Installation

RXD Receive indicator, ON when your DTE/computer receives data

on the serial port.

CD Carrier Detect indicator; lights up when a valid carrier is

detected present on the line.

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.

CTS DTE mode: Clear To Send indicator; lights up when modem

can accept data for transmission. It indicates the signal status of
RS232 signal CTS.

Front Panel Switches

The four arrow keys are for panel operations, allow intuitive menu tree
operation and display modem status. Refer to Panel Operstion section
in the Chapter LCD Panel Operation for details of menu key
operations.

Rear Panel Markings

The U-336S/SA rear panels are shown below:

Figure 2-3 U-336S Rear Panel

Figure 2-4 U-336SA Rear Panel

Explanations of the connectors and switch on the rear panel are given
below.

• POWER

Installation 9

Power switch, turns the modem ON or OFF.

• POWER JACK

Input terminal for power. Use the supplied AC adapter for U-336S

model. For U-336SA model you can use your power cord to
directly connect to the AC power outlet.

• 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.

• EIA-232D

Serial port DB25S connector, for connection to the serial port of a

DTE (computer/terminal). Pin assignments are listed in Chapter 12
Connector Pinouts for your reference. The signal-pi n assignments
for RJ-11 phone jacks are also listed in Chapter 12 Connector
Pinouts.

Modem Connection

When you connect your U-336S 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.
Connect your modem as shown in Figure 2-5 U-336S Modem
Connections.

10 Installation

Figure 2-5 U-336S Modem Connections

For the U-336SA you don’t need an AC adapter. Use the supplied
power cord to connect your modem to the AC power outlet.

Figure 2-6 U-336SA Modem Connections

If a leased line is not used, simply leave the connection open. There are
no DIP switches or configuration settings that you need to worry about.
Your modem comes factory pre-set and allows you to fully configure
the modem from the LCD display. User configurations are also

Installation 11

conveniently stored in user selectable non-volatile memories and can be
recalled as often as needed.

Powering Up

Once your modem’s power switch is turned ON, a series of diagnostic
tests will be performed while a message is shown on the LCD panel.
For a more detailed description of these diagnostic tests, please refer to
Chapter 10 Diagnostics & Troubleshooting.

After performing the diagnostic tests, your modem will display the
current modem settings on the LCD panel as shown below:

Your modem is now ready for use.

LINK OPTION

Figure 2-7 Idle Screen

12 Installation

Multi-auto V42b DL
D R O A 115200 AS

ERROR CONTROL
LINE TYPE

DATA FORMAT

DTE RATE

ANSWER MODE

ORIGINATE MODE

REDIAL LAST NUMBER

DIALING

3 Basic Modem Operation

This chapter covers the basic commands and techniques involved in
modem operation. In many cases, this is the only information you will
need in order to get up and running with communication software, and
to start making connections with your modem.

Understanding AT Commands

The U-336S/SA communicates asynchronously with computers using
AT commands. AT commands are used to configure and control your
modem. Commands are usually sent to the modem by way of
communication software, but can also be entered manually by the user
with the computer keyboard.

Command statements must be written in a specific form in order for
your modem to recognize them. A command statement always begins
with the letters AT or at. It is then followed by one or more commands
and the <Enter> key.

AT commands can only be issued when your modem is in “command
mode” or “off-line.”

Once your modem has established a connection with another modem it
is said to be “on-line” or in “data mode.” In this mode, the characters
sent to your modem by your computer are transmitted to the remote
modem rather than being interpreted by your modem as commands.

Basic Modem Operation 13

Using the Windows 95 Hyper Terminal
Program

In order to issue an AT command statement, you first need to run a
communication program such as the Microsoft Windows “Hyper
Terminal ” program. This program provides a simple method to manually
enter AT commands so you can do such things as “customize” the
settings of your modem, or store commonly used phone numbers.

Once your modem is connected to your computer’s serial port and
telephone line, open the Windows 95 “Accessories” program group,
and open the Hyper Terminal Program.

The program will prompt you for a name and Icon to use for your new
connection. Type the name Test Connection and press <Enter>.

Next, you will be prompted for country information, area code and
phone number, and the device used to make the connection. For this
test purpose, do not enter a phone number; simply choose the COM
port your modem is connected to from the “Connect Using” list. Click
“OK” when finished.

The next window sets the COM port settings. The settings used for
your modem should be as follows.

Bits per second: 57600
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: Hardware

Click “OK” when finished. After you have done this, save your new
connection by selecting “Save” from the “File” menu and click “OK.” A
new connection icon will be added to your Hyper Terminal folder.

14 Basic Modem Operation

You are now ready to start entering AT commands.
In the terminal window, type:

AT<Enter>

Your modem responds

OK

This confirms that the modem and your computer are communicating
correctly.

To test the telephone line connection issue the manual answer
command.

Type:

ATA<Enter>

Your modem will pick up the phone line, and try to communicate.
Normally, this command is only used to answer an incoming call made
from another modem, thus the high pitched tone you will hear from the
speaker. To abort the operation, press any key, or select “Discon nect”
from the “Call” menu.

Dialing and Answering Techniques

Depending on what communications software you use to make modem
connections, you may not have as much control of how the modem dials
the telephone number. This section shows some useful examples of the
AT commands used for dialing and answering operations. The
command characters specific to each function are shown in bold type.

Dialing using the ATD Command

Touch Tone Dialing: ATDT 555 1212
Pulse Dialing: ATDP 555 1212

Basic Modem Operation 15

Tone and Pulse Dialing: ATDP 555 1212 WT 24
Dialing Through a PBX: ATDT 9 W 555 1212

ONOTE: THE 'W' IN THE DIAL STRING WILL CAUSE THE MODEM TO WAIT FOR A SECOND

DIAL TONE BEFORE IT CONTINUES TO DIAL.

Pausing During Dialing: ATDT 9,,555 1212

ONOTE: THE PAUSE TIME FOR EACH COMMA IS DEFINED BY S REGISTER S8. DEFAULT

IS 2 SECONDS PER COMMA.

Di aling Without Waiting for Dial Tone: ATX0D, 555 1212
Originating a call using an Answer Tone: ATDT 555 1212,,,,,,R
Redialing the Last Number Called: ATDL
Waiting for Five Seconds of Silence: ATDT 800 555 1212 @
123456,1 714 555 1212
Transferring a Call (using flash hook): ATDT! 2468

Auto-Answer and Hook Controls

Enabling Auto-Answer: ATS0=n

ONOTE: IN THIS EXAMPLE, N IS A NUMBER FROM 1 TO 255 THAT CORRESPONDS TO THE

NUMBER OF RINGS AFTER WHICH YOUR MODEM ANSWERS AN INCOMING CALL.

Disabling Auto-Answer: ATS0=0
Manually Answering a Call: ATA
Take modem off-hook: ATH1
Hang up modem (on-hook): ATH0
Manually Disconnecting a Call: +++ATH

16 Basic Modem Operation