ZyXEL Communications COMET 336 User manual

Comet 336
User’s Manual
March 97
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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 option, 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 option 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.
Acknowledgments
The trademarks and brand names mentioned in this manual are used for plain informational
purposes. Trademarks and brand names are the property 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 B digital
device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. 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. However, there is no
guarantee that interference will not occur in a particular installation.
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.

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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.
FCC Requirements
This equipment complies with Part 68 of the FCC Rules. On the base unit of this equipment is a
label that contains, among other information, the FCC Registration Number and the Ringer
Equivalence Number (REN) for this equipment.
IF REQUESTED, THIS INFORMATION MUST BE GIVEN TO THE TELEPHONE
COMPANY.
The REN is useful to determine the quantity of the devices you may connect to your telephone
line and still have all of those devices ring when your telephone number is called. In most, but
not all areas, the sum of the RENs of all devices connected to one line should not exceed five
(5.0). To be certain of the number of devices you may connect to your line, as determined by
the total RENs, you should contact your local telephone company to determine the maximum
REN for your calling area.
If your equipment causes harm to the telephone network, the telephone company may
discontinue your service temporarily. If possible, they will notify you in advance. But if advance
notice isn’t practical, you will be notified as soon as possible. You will be informed of your right
to file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper functioning of your equipment. If they do, you will be
notified in advance to give you an opportunity to maintain uninterrupted telephone service.
If you experience trouble with this telephone equipment, please contact the Address and Phone
number listed in the warranty card for information on obtaining service or repairs.
The telephone company may ask that you disconnect this equipment from the network until the
problem has been corrected or until you are sure the equipment is not malfunctioning.
The user is not authorized to repair or modify the equipment.
This equipment may not be used on coin service provided by the telephone company.
Connection to party lines is subject to state tariffs.
You will find also this information on a sticker on the bottom of the modems case.
The modem is connected to a public switched line using a USOC (Universal Service Order
Code) RJ-11C modular jack.
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].

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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.
• 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, ROC
or
ZyXEL Communications Inc.
4920 E. La Palma Avenue
Anaheim, CA92807, USA

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Table of Contents
Limited Warranty ii
FCC Part 15 Information ii
FCC Requirements iii
Contacting ZyXEL iii
1 Introduction 1
Unpacking Your Modem 1
Becoming a Registered Owner 1
2 Installation 3
Optional Steps for Comet 336 Installation 3
Telephone Jack 4
Microphone 4
Speaker 4
Driver and Software Installation 4
Windows 95 Driver Installation 4
Windows 95 Dial-up Networking 6
Setup for DOS Fax/Modem Software 11
3 Basic Modem Operation 14
Understanding AT Commands 14
Using the Windows 95 Hyper Terminal Program 14
Dialing and Answering Techniques 15
Dialing using the ATD Command 15
Auto-Answer and Hook Controls 16
Making Your First Connection 16
Quick Tips when issuing AT Commands 16
Modem Result Codes 18
Viewing S Register Values 18
Changing S Register Values 18

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Non-Volatile Memory 18
Storing Phone Numbers 19
Dialing Stored Phone Numbers 19
Saving Settings and User Profiles 19
Helpful Hints for PC Computers 19
Default Modem Settings for PC’s 20
4 Advanced Data Communications 22
Front Panel LEDs 22
DTE Interface 22
Synchronous and Asynchronous Communications 22
UART 23
Serial Port 23
Serial RS-232C Cable 23
Communication Protocols and Speeds 23
Universal Protocol Compatibility 24
Error Control 24
CRC (Cyclical Redundancy Check) Error Detection 25
Data Compression 25
Run Length Encoding 25
Adaptive Frequency Encoding 25
String Coding 25
Hardware or Software Flow Control 26
Hardware CTS/RTS 26
Software XON/XOFF 26
5 Special Functions 27
Caller Number Delivery (Caller ID) 27
Caller ID Result Codes 27
Caller ID Inquiries 27
Caller ID Formatted Form Reporting 27
Distinctive Ring 28
6 AT Command Set Summaries 30

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Basic AT Command Set 30
Extended AT& Command Set 31
Extended AT* Command Set 33
7 Status Registers & Result Codes 36
S-Registers "ATSn=x" 36
S-Register Definitions 36
Result Code Options 39
"ATXn" Result Code Option Table 39
Result Code Field Descriptions 40
8 Fax Operation 42
Modem as Fax Machine 42
ITU-T T.30 Fax Protocol 42
Fax Command sets 42
Defining the Fax Command Sets 43
Flow Control 43
FAX Class 1 AT Command Set 43
FAX Class 2 AT Command Set 44
9 Voice Operation 48
Voice AT Command Set 60

Introduction 1
1 Introduction
Congratulations on the purchase of your Comet 336 modem - one of ZyXEL's premier
high-performance products. The Comet 336 is world renown for its ability to maintain
ultra high speeds and clear, quality connections while communicating around the globe.
Unpacking Your Modem
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 (1) Comet 336 modem
• One (1) AC power adapter (external model)
• One (1) RJ-11 modular telephone cable
• One (1) Comet 336 User’s Manual
• One (1) ZyXEL modem driver diskette with Windows 95 INF file
• One (1) Data/Fax software for Windows environments
• One (1) warranty/registration card
• One (1) Zy CD
• One (1) standard RS-232 cable
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 packaging materials for future storage or shipping needs.
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 - please also
save your dated invoice as proof of purchase.

2 Introduction

Installation 3
2 Installation
This chapter covers the steps required to install your modem and install and configure
the Windows 95 driver.
1. Turn off your computer.
2. Open the rear panel on the back of your modem.
3. Connect the power adapter. Plug one end of the power adapter to the round
POWER JACK on the back of the modem. Plug the other end to an AC wall outlet.
You can leave the power adapter plugged in when you are not using the modem. To
prevent power surges from damaging your modem and computer, it is recommended
that you connect the power adapter to a surge protector.
4. Connect the serial cable. Plug one end of the serial cable into the SERIAL PORT
connector on the back of the modem. Plug the other end of the serial cable to the
back of your computer. Your Comet 336 comes with a high-speed serial interface
capable of reaching DTE speeds of 115.2Kbps. Be sure that your PC serial port has
a high-speed 16550 compatible Universal Asynchronous Receiver Transmitter
(UART).
5. Connect the telephone cord. Plug one end of the supplied telephone (RJ-11) cord
into the LINE jack on the back of the modem. Plug the other end into a telephone
wall jack, just as you would a standard telephone.
6. Turn the Comet 336 on by raising the blue power switch. The PWR LED should
come on and the modem performs a self-test procedure.
7. Turn the computer back on.
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Optional Steps for Comet 336 Installation
The Comet 336 is equipped with a telephone jack and speaker and microphone jacks on
the back panel. The following sections briefly describe how to take advantage of these
features.