ZyXEL Communications U-336S User manual

U-336S and U-336SA
User’s Manual
Version 3.0
ZyXEL
TOTAL INTERNET ACCESS SOLUTION

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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 or character to the purchaser.
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

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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

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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.
Information for Canadian 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

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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.

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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
approximationof 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
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:

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•Sales inquiries: [email protected] in North America
[email protected] outside North America.
•Technical support: [email protected] in North America.
[email protected] 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.

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Contents
ZyXEL Limited Warranty ii
FCC Part 15 Information iii
Information for Canadian Users iv
Contacting ZyXEL vi
1Introduction 1
Required Equipment 1
Modem Features 2
Standard Features 2
Intelligent Features 3
Fax Compatibility 4
Technical Specifications 4
2Installation 7
Front Panel7
Front Panel LEDs 8
Front Panel Switches 9
Rear Panel Markings 9
Modem Connection 10
Powering Up 12
3Basic Modem Operation 13
Understanding AT Commands 13
Using the Windows 95 Hyper Terminal Program 14
Dialing and Answering Techniques15
Dialing using the ATD Command 15

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Auto-Answer and Hook Controls 16
Quick Tips when issuing AT Commands17
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 Computers22
Default Modem Settings for PC’s 23
ZyXEL Serial/Parallel I/O Card 23
Helpful Hints for Mac Computers24
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
4LCD Panel Operation 28
LCD Panel28
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

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Dialing a Number 33
ManualDial 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 Mode44
Answering from Synchronous Mode 45
Auto-Answer 45
Manual Answer 45
5Leased Line Operation 46
Connecting to a Leased Line46
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
6Special Functions 50
Security Functions 50
Levels of Security 50
User Passwords 51
Remote Configuration 53
Caller Number Delivery (Caller ID)54
Distinctive Ring 57

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Extended Distinctive Ring (EDR)59
Setting Up EDR 60
EDR Application Example 61
7Fax Operation 64
Fax Basics 64
Modem as Fax Machine65
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
8AT Command Set Summaries 88
Basic AT Command Set88
Description of ATI2 Output: 91
Extended AT& Command Set94
Extended AT* Command Set100
9Status 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

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Connect Strings for Error Corrected Connections 127
10Diagnostics & 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
11Upgrading Your Modem 140
Upgrading by Flash EPROM 140
Kernel Recovery Mode 141
12Connector Pinouts 142
Phone Jack Pinouts 142
PC Serial Port Pinouts142
Macintosh Serial Port Pinouts144
13Index 146

Introduction 1
1Introduction
Congratulations on the purchase of your U-336S/SA modem -one of
ZyXEL's premier high-performance products. The U-336S and the U-
336SA 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.

2 Introduction
•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
•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.

Introduction 3
•Extended 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.

4 Introduction
•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.
•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.

Introduction 5
•Audio Monitor: programmable volume control.

6 Introduction