ZyXEL Communications U-336R/RE User manual

U-336R/RE
User’s Guide
Version 1.0
(Mar. 1997)
ZyXEL
ACCESSING INTERNET & INTRANET

ii
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 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

iii
rights, and you may also have other rights which vary from state to
state.
Copyright © 1997 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 limits are designed to provide reasonable protection
against harmful interference in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy,

iv
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 company. The equipment must also be installed
using an acceptable method of connection. In some cases, the

v
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:
This product has been approved for connection to the Public
Switched Telecommunication Network using interfaces compatible
with ITU-TSS recommendation I.420. This product complies with
the following directives:

vi
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 electromagnetic 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] EXT
252 between 8:00AM and 5:00PM Taiwan time (GMT +8:00).
•Fax: ZyXEL in North America: [phone] or Taiwan:
[phone]
•E-mail:
•Sales inquiries: [email protected] in North America.
[email protected] outside North America.
•Technical support: [email protected] in North America.
[email protected] outside North America.

vii
•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 and Asian versions and related files, use the
address: ftp.zyxel.co.at
•Postal Service: You can send written communications to the
following address:
ZyXEL Communications Corporation
6, Innovation Road II, Science-Based Industrial Park
Hsinchu, Taiwan 300, R.O.C.
or
ZyXEL Communications Inc.
4920 E. La Palma Avenue
Anaheim, CA92807, U.S.A.

viii
Contents
ZyXEL Limited Warranty ii
FCC Part 15 Information iii
Information for Canadian Users iv
Contacting ZyXEL vi
1Introduction 1
What This Manual Covers 1
Modem Features 1
Standard Features 1
Intelligent Features 2
Fax Compatibility 3
Technical Specifications 3
Unpacking Your Modem 4
Enclosed Equipment 4
Required Equipment 4
Becoming a Registered Owner 5
2Installation 7
U-336R/RE Modem Card 7
Required Steps for U-336R/RE Installation 9
Installing the modem card 10
Connect to phone lines 10
Connect to Computers 11
Hooking Up Power 11
Fax/Modem Communication Software Installation 11
3Basic Modem Operation 15
Understanding AT Commands 15
Using the Windows 95 Hyper Terminal Program 15
Dialing and Answering Techniques 17

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Dialing using the ATD Command 17
Auto-Answer and Hook Controls 18
Making Your First Connection 18
Quick Tips when issuing AT Commands 19
Modem Result Codes 21
Viewing S Register Values 22
Changing S Register Values 22
Non-Volatile Memory 23
Storing Phone Numbers 23
Dialing Stored Phone Numbers 23
Saving Settings and User Profiles 24
Helpful Hints for PC Computers 24
Default Modem Settings for PC’s 25
ZyXEL Serial/Parallel I/O Card 25
Helpful Hints for Macintosh Computers 26
Special AT Command Settings for Macintosh 26
Macintosh Serial Port 26
Mac Software Tips 26
Helpful Hints for UNIX-Based Computers 27
Serial Cable 27
Basic Modem Settings for UNIX 27
Unix Software Tips 28
4Synchronous Mode Operation 29
V.25bis Command Set 29
Clock Options 30
RTS Options 31
Command State Options 32
Dialing from Synchronous Mode 32
Answering from Synchronous Mode 33
Auto-Answer 33
Manual Answer 33
5Leased Line Operation 35

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Connecting to a Leased Line 35
Line Type Setting 35
Power Level Setting 36
Leased Line Handshaking 36
Manual Connect 36
Auto Handshake 36
Leased-Line Dial Backup 37
Dial Backup 37
Aborting from Leased-Line Operation 38
Terminating a Leased Line Connection 38
6Special Functions 39
Security Functions 39
Levels of Security 39
User Passwords 40
Remote Configuration 42
Caller Number Delivery (Caller ID) 43
Distinctive Ring 46
Extended Distinctive Ring (EDR) 47
Setting Up EDR 49
EDR Application Example 50
7Fax Operation 53
Modem as Fax Machine 53
ITU-T T.30 Fax Protocol 54
Fax Command sets 54
Defining the Fax Command Sets 54
Class 1 Command Set 55
Class 2 Command Set 56
Class 2.0 Command Set 63
Extended Fax AT Command Set 70
Flow Control 74
Fax Reception from a BBS 75

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8AT Command Set Summaries 77
Basic AT Command Set 77
Description of ATI2 Output: 80
Extended AT& Command Set 83
Extended AT* Command Set 89
9Status Registers & Result Codes 92
S-Register Descriptions 92
Basic S-Registers "ATSn=x" 92
Extended S-Registers "ATSn=x" 93
Result Code Options 111
"ATXn" Result Code Option Table 111
Result Code Field Descriptions 113
Connect Strings for Error Corrected Connections 113
10 Diagnostics & Troubleshooting 116
Diagnostics 116
Power-On Self Test 117
Loopback Tests 118
Indicator Lights 119
Line Condition Status Display 120
Link Status Report (ATI2) 122
Trouble Shooting 126
AT Command Set Problems 126
Command Echo Problems 128
Answer Problems 128
Dialing Problems 129
Data Transfer Problems 130
Connect Problems 130
11 Upgrading Your Modem 131
Upgrading by Flash EPROM 131
Kernel Recovery Mode 132

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12 Terminal Pinouts 133
Terminal Blocks 133
PC Serial Port Pinouts 134
Macintosh Serial Port Pinouts 135
13 Index 137

Introduction 1
1Introduction
What This Manual Covers
Congratulations on the purchase of your U-336R/RE modem - one
of ZyXEL's premier high-performance products. The U-336R/RE
modem cards are world renown for their ability to maintain ultra
high speeds and clear, quality connections while communicating
around the globe.
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 Intelligent
features designed to make your data communications faster, easier,
and more convenient.
Standard Features
•Supports V.34 for 28,800bps 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.

2Introduction
•14 LED indicators (RE/RD).
•15 LED indicators (R).
•Extended AT command set with V.25bis.
•Operates on 2-wire dial-up or 2-wire leased line (RE).
•Operates on 2-wire dial-up or 2/4-wire leased line (R).
Intelligent Features
•Automatic data, and fax call detection allows you to use a
single telephone line to handle both voice and data 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, fax and voice calls (this feature
requires communication software that supports distinctive ring,
such as ZFAX)
•Remote configuration capability.

Introduction 3
•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.
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.
•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.

4Introduction
•Line interface: 2-wire dial-up or 2-wire leased line (RE).
•Line interface: 2-wire dial-up or 2/4-wire leased line (R).
•Call progress monitoring: dial tone, busy, and ring back
detection.
•Audio Monitor: programmable volume control.
Unpacking Your Modem
Enclosed Equipment
Before you proceed further, please check all items you received
with your modem against this list to make sure nothing is missing.
The complete package should include:
•One U-336R/RE universal modem.
•One warranty/registration card.
Contact your dealer or the store where you bought the modem if
anything is missing. Check the modem for shipping damages. If you
find any damage, contact the shipping agency immediately.
Retain shipping and cushioning materials for future storage or
shipping needs.
Please direct any additional questions about damaged or missing
materials to your dealer or distributor, or see page vi to contact
ZyXEL.
Required Equipment
In addition to the ZyXEL modem you just purchased, you must
have the following equipment to operate your modem:

Introduction 5
•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.
•Available AC wall outlet.
•Telephone line from your telephone company (dial-up or leased
line).
•Data and fax communication software.
Becoming a Registered Owner
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. Also save your
dated invoice as proof of purchase.

6Introduction

Installation 7
2Installation
This chapter covers the steps required to install your U-336R/RE
modem into a ZyXEL RS-1612 rack system. A separate
comprehensive manual containing rack system information is
included with your modem rack chassis.
U-336R/RE Modem Card
The U-336R front panel consists of fifteen LED indicators and two
switches. The U-336RE front panel consists of fourteen LED
indicators and two switches. The LEDs on the front panel, display
the current status and configuration of the modem. Refer to the
following table for details on the LED status indicators and their
meaning.
LED Name ON Blinking
PWR Power Indicator The modem is on
and operational.
TST Test Indicator The modem is in test
mode.
V34 V.34 Mode
Indicator The modem is operating in V.34
mode.
The modem is
in
Handshaking
state.

8Installation
LED Name ON Blinking
TXD Transmit
Indicator The DTE is sending data to modem for
transmission.
RXD Receive
Indicator The modem is sending received
data to the DTE.
CD Carrier Detect The modem senses a
valid data carrier on
the line.
DTR Data Terminal
Ready The attached computer is ready to
send or receive data.
DSR Data Set Ready The modem is ready
to send or receive
data.
RTS Request to Send The DTE requests
to send data for
transmission.
CTS Clear to Send The modem is able
to accept data for
transmission.
OH Off Hook
Indicator The modem is in Data Mode or Off
Hook.
ORG Originate Mode
Indicator Modem is in Originate Mode.
RI Ring Indicator Modem is in Auto-
Answer mode. Modem detected an
incoming call.