Cylink VoiceXtender User manual

Installation Guide
Cylink VoiceXtender Modem
Package: 81229-00A
August 1997
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CYLINK CORPORATION
910 Hermosa Court
Sunnyvale, California 94086, USA
[phone]
CYLINK LIMITED U.K.
Tel: [phone]
Fax: [phone]
CYLINK CORPORATION (Singapore)
Tel: [phone]
Fax: [phone]
CYLINK CORPORATION (New Delhi)
Tel: [phone]
Fax: [phone]
CYLINK CORPORATION (Beijing)
Tel: [phone]
Fax: [phone]
CYLINK CORPORATION (Karachi)
Tel: [phone]
Fax: [phone]
CYLINK CUSTOMER SUPPORT
1-800-545-6608 (USA - California)
1-800-814-5587 (USA - New Jersey)
1-408-735-5822 (Internaltional - California)
1-201-333-3400 (International - New Jersey)
[phone] (Cylink Limited - U.K.)

Rev. A - 8/97 i
COPYRIGHT 1994 - 1997 Cylink Corporation, World Rights Reserved
Cylink Corporation provides this document “as is,” without warranty of any kind, either expressed or implied,
including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Cylink Corporation may make improvements and changes to the product described in this Manual at any
time and without notice. Cylink Corporation assumes no responsibility for its use, nor any infringements of
patents or other rights of third parties that would result.
This document could contain technical inaccuracies or typographical errors. Periodic changes are made to
the information contained herein; these changes will be incorporated into new editions of the Manual.
No part of this publication may be stored in a retrieval system, transmitted, or reproduced in any way,
including, but not limited to, photocopy, photograph, magnetic or other records, without the prior written
permission of Cylink Corporation.
VoiceXtender is a trademark and CYLINK® is a registered trademark of the Cylink Corporation.
PRODUCT COMPATIBILITY
While every effort has been made to verify operation of this product with many different communications
products and networks, Cylink Corporation makes no claim of compatibility between its products and other
vendors’ equipment. It is assumed that users have thoroughly evaluated this product’s performance in the
communications environment in which it will be used.
SAFETY
The following general safety precautions must be observed during all phases of operation and service of this
product. Failure to comply with these precautions or with specific warnings elsewhere in this Manual willfully
violates standards of design, manufacture, and intended use of the product. Cylink Corporation assumes no
liability for the customer's failure to comply with these requirements.
This product must be grounded. In the event of a short circuit, grounding reduces the risk of electrical shock
by providing an escape wire for the current.
The product's AC power cord ends in a three-pole grounding plug. Do not use a three-pole to two-pole
adapter with the plug. Verify that the outlet you intend to use is properly installed and grounded; the outlet
used must comply with the local electric code.
Do not install or operate this product in the presence of flammable gases or fumes. Operation of any
electrical instrument in such an environment constitutes a definite safety hazard.
No user maintained or adjustable components are present within this product. The covers should not be
removed by anyone other than authorized Cylink service personnel. The potential for electrical shock exists
within the cabinet at all times unless it is unplugged.
Do not install substitute parts or perform any unauthorized modification to the VoiceXtender modems.
Return the product to Cylink Corporation for service and repair to ensure that safety features are
maintained. Prior to returning any product(s) for repair, contact Cylink at the telephone numbers or address
located on the front of this Manual, and obtain a Return Material Authorization (RMA) number.
Changes or modifications not expressly approved by Cylink Corporation can void the user’s authority to
operate the equipment.

ii Rev. A - 8/97
TOWER CONSTRUCTION
Compliance with local zoning and tower construction regulations is recommended when VoiceXtender digital
modem radios require a tower. These regulations generally mandate that permits be obtained before any
tower construction begins. Check with local zoning and aviation authorities for more information.
FCC PART 68 INFORMATION
Federal Communications Commission (FCC) Rules on spread spectrum devices, such as the VoiceXtender,
require that you be notified of the following:
This equipment complies with Part 68 of the FCC Rules. The FCC Part 68 label is located on the bottom of
the enclosure. This label contains the FCC Registration Number for this equipment. If requested, this
information must be provided to your telephone company.
The REN is useful to determine the quantity of 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 REN, you should contact your local telephone
company to determine the maximum REN for your calling area.
Connection to the telephone network should be made by using standard modular telephone jacks, type
RJ11C or RJ11W. The RJ11C or RJ11W plug and/or jacks used must comply with FCC Part 68 rules.
If this telephone equipment causes harm to the telephone network, the telephone company will notify you in
advance that temporary discontinuance of service may be required. But if advance notice isn’t practical, the
telephone company will notify the customer as soon as possible. Also, you will be advised of your right to file
a complaint with the FCC if you believe it is necessary.
The telephone company may make changes in it’s facilities, equipment, operations or procedures that could
affect the proper functioning of your equipment. If they do, you will be notified in advance in order for you to
make necessary modifications to maintain uninterrupted service.
This equipment may not be used on coin service provided by the telephone company. Connection to party
lines is subject to state tariffs.
REPAIR INSTRUCTION
Repairs to this equipment can only be made by the manufacturer or its authorized agents. If this equipment
is causing harm to the telephone network, the telephone company may request that it be unplugged from the
modular outlet until the problem has been corrected. To obtain repair service or warranty information
contact:
Cylink Corporation
1350 Bordeaux Drive
Sunnyvale, CA 94089
Attn: Repair and Return Department
1-800-545-6608
FCC regulations require that this device be professionally installed by a person knowledgeable in electronics
and trained in the correct installation of this device.
All interface cables must be shielded.
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, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

Rev. A - 8/97 iii
INDUSTRY CANADA NOTICE
Notice: The Industry Canada label identifies certified equipment. This certification means the equipment
meets telecommunications network protective, operational. And safety requirements as prescribed in the
appropriate Terminal Equipment Technical Requirements documents(s). The Department does not
guarantee the equipment will operate to the 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. The customer should be aware that compliance with the above conditions may not
prevent degradation of service in some situations.
Repairs to certified equipment should be coordinated by a representative 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 this equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility,
telephone lines and internal metallic water pipe system, if present, are connected together. This precautions
may be particularly important in rural areas.
CAUTION Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate.
Notice: The Ringer Equivalence Number (REN) assigned to each terminal device provides an indication of
the maximum number of terminals to be connected to a telephone interface. The combination of devices
subject only to the requirement that the sum of the Ringer Equivalence Numbers of all the devices does not
exceed 5.
RADIO FREQUENCY INTERFERENCE
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus
set out in the Radio Interference Regulations of the Canadian Department of Communications

iv Rev. A - 8/97
STATEMENT OF WARRANTY
CYLINK products, except as stated otherwise in an applicable price list, are warranted against defects in
workmanship and material for a period of one (1) year from date of delivery as evidenced by CYLINK’s
packing slip or other transportation receipt.
CYLINK’s sole responsibility under this warranty shall be to either repair or replace, at its option, any
component which fails during the applicable warranty period because of a defect in workmanship and
material, provided PURCHASER has promptly reported same to CYLINK in writing. All replaced Products or
parts shall become Cylink’s property.
CYLINK shall honor the warranty at CYLINK’s repair facility in Sunnyvale, California. It is PURCHASER’s
responsibility to return, at its expense, the allegedly defective Product to CYLINK. PURCHASER must
obtain a Return Materials Authorization (RMA) number and shipping instructions from CYLINK prior to
returning any Product under warranty. Transportation charges for the return of the Product to PURCHASER
shall be paid by CYLINK within the United States. For all other locations, the warranty excludes all costs of
shipping, customs clearance and other related charges. If CYLINK determines that the Product is not
defective within the terms of the warranty, PURCHASER shall pay CYLINK all costs of handling,
transportation and repairs at the then prevailing repair rates.
All the above warranties are contingent upon proper use of the Product. These warranties will not apply (i) if
adjustment, repair or parts replacement is required because of accident, unusual physical, electrical or
electromagnetic stress, negligence of PURCHASER, misuse, failure of electric power environmental
controls, transportation, not maintained in accordance with CYLINK specifications, or abuses other than
ordinary use (ii) if the Product has been modified by PURCHASER or has been repaired or altered outside
CYLINK’s factory, unless CYLINK specifically authorizes such repairs or alterations; (iii) where CYLINK
serial numbers, warranty data or quality assurance decals have been removed or altered.
CYLINK also reserves the right to make product improvements without incurring any obligation or liability to
make the same changes in Products previously manufactured or purchased. In no event shall CYLINK be
liable for any breach of warranty in an amount exceeding the net selling price of any defective Product. No
person, including any dealer, agent or representative of CYLINK is authorized to assume for CYLINK any
other liability on its behalf except as set forth herein. Nonpayment of any invoice rendered within the stated
payment terms automatically cancels any warranty or guarantee stated or implied. If any payment is due
CYLINK for services performed hereunder, it shall be subject to the same payment terms as the original
purchase.
CYLINK HEREBY DISCLAIMS ALL IMPLIED WARRANTIES ON PRODUCTS INCLUDING WITHOUT
LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. The warranties expressly stated herein are the sole obligation or liability on the part of CYLINK
arising out of or in connection with the sale or performance of the products.
Products Manufactured by Others - For products not manufactured by CYLINK the original manufacturer’s
warranty shall be assigned to PURCHASER to the extent permitted and is in lieu of any other warranty,
express or implied. For warranty information on a specific product, a written request should be made to
CYLINK.
IN NO EVENT WILL CYLINK BE LIABLE TO PURCHASER FOR (i) REPROCUREMENT COSTS; (ii) SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES; (iii) ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT, OR THE
USE OF PERFORMANCE OF CYLINK PRODUCTS, REGARDLESS OF WHETHER THE CAUSE OF ACTION
IS IN CONTRACT, TORT, INCLUDING NEGLIGENCE, OR ANY OTHER FORM.
No action, whether in contract or tort, including negligence, arising out of or in connection with this
Agreement, may be brought by either party more than eighteen (18) months after the cause of action has
accrued, except that an action for nonpayment may be brought within eighteen (18) months of the date of
last payment.

Rev. A - 8/97 v
Table of Contents
Preface About This Manual............................................................................ix
Who Should Read This Manual................................................................x
How to Use This Manual..........................................................................x
Manual Conventions................................................................................xi
Customer Support....................................................................................xi
Reader Response...................................................................................xii
Chapter 1 Introduction................................................................................1-1
Product Overview.................................................................................1-2
Features..........................................................................................1-3
Applications.........................................................................................1-3
Front Panel Description.........................................................................1-4
Rear Panel Description..........................................................................1-5
Chapter 2 System Planning.........................................................................2-1
Introduction..........................................................................................2-2
Antenna Options...................................................................................2-2
Omnidirectional Antenna................................................................2-2
Directional Antenna........................................................................2-3
Path Analysis.......................................................................................2-3
Determining the Fade Margin..........................................................2-4
System Gain..............................................................................2-4
Antenna Gain............................................................................2-5
Cable/Connector Loss................................................................2-5
Free Space Path Loss.................................................................2-5
Application Examples...........................................................................2-7
Example 1: Point-to-Point Application............................................2-7
Example 2: Point-to-Point Intercom Application..............................2-9
Example 3: Hub Application.........................................................2-11
Chapter 3 Installation and Setup................................................................3-1
System Setup........................................................................................3-2
Switch Settings.....................................................................................3-2
VoiceXtender Switch Settings.........................................................3-3
VoiceXtender Switch Parameters....................................................3-4

vi Rev. A - 8/97
Cabling the Modem...............................................................................3-6
Installing the Antenna....................................................................3-6
Connecting the Line/Phone Interface................................................3-7
Cabling a Hub Application..............................................................3-8
Connecting the Power......................................................................3-9
System Startup...................................................................................3-10
Directional Antenna Alignment.....................................................3-10
Adjusting the Audio Receive Level................................................3-13
Chapter 4 Troubleshooting..........................................................................4-1
Operational Problems...........................................................................4-2
Maintenance.........................................................................................4-3
Appendix A Specifications........................................................................A-1
General Specifications.........................................................................A-2
Interface Specifications........................................................................A-7
Appendix B Worksheets............................................................................B-1
Appendix C Glossary.................................................................................D-1
Index...................................................................................................Index-1

Rev. A - 8/97 vii
List of Figures
1-1 VoiceXtender....................................................................................1-2
1-2 VoiceXtender - Front Panel................................................................1-4
1-3 VoiceXtender - Rear Panel.................................................................1-5
2-1 Omnidirectional Antenna...................................................................2-2
2-2 Yagi Directional Antenna...................................................................2-3
2-3 Fade Margin Calculation....................................................................2-4
2-4 Point-to-Point Application.................................................................2-8
2-5 Point-to-Point Intercom Application...................................................2-9
2-6 Hub Application..............................................................................2-11
3-1 VoiceXtender Switch Settings............................................................3-3
3-2 Connecting the Low-Gain Omnidirectional Antenna............................3-6
3-3 Connecting the Line and Phone Interface.............................................3-7
3-4 Burst Synchronization Cabling...........................................................3-8
3-5 Connecting the Power.........................................................................3-9
3-6 Antenna Alignment Flow Chart........................................................3-12
3-7 Volume Adjustment..........................................................................3-13
A-1 Rear Panel RJ11 Connector.................................................................A-7
A-2 Rear Panel Power Input Connector (Female DIN)................................A-7

viii Rev. A - 8/97
List of Tables
2-1 Free Space Path Loss Between Two Isotropic Radiators (in miles)........2-6
2-2 Free Space Path Loss Between Two Isotropic Radiators (metric)..........2-7
A-1 General Specifications......................................................................A-2
A-2 FXO Specifications...........................................................................A-2
A-3 FXS Specifications............................................................................A-3
A-4 Physical and Environmental Specifications.......................................A-3
A-5 Connector Specifications....................................................................A-3
A-6 Power Specifications.........................................................................A-4
A-7 User Interface DIP Switches..............................................................A-4
A-8 General Radio Frequency Specifications.............................................A-5
A-9 Transmitter Specifications................................................................A-5
A-10 RF Channel Frequencies - VoiceXtender ............................................A-6
A-11 Receiver Specifications.....................................................................A-6

Rev. A - 8/97 ix
P
PREFACE REFACE
About This Manual
About This Manual
The VoiceXtender Modem Installer’s Guide provides information to
install, configure, monitor, and test the VoiceXtender. This section
describes the intended audience for this manual, summarizes the
contents, explains the conventions, and provides customer support
and reader response information.
Inside this section:
WhoShouldReadThisManual..................................................x
HowtoUseThisManual.............................................................x
ManualConventions...................................................................xii
CustomerSupport..................................................................xiii
ReaderResponse.....................................................................xiv

AirLink VoiceXtender Modem Installer’s Guide
Preface
xRev. A- 8/97
Who Should Read This Manual
This manual is for people who will install, configure, and operate Cylink’s
VoiceXtender modems. The manual provides general guidelines on how to
prepare for and configure the AirLink modems for use in a typical environment,
including system planning, antenna options, and path analysis. We assume
that you have experience with and an understanding of the concepts underlying
telecommunications systems, as well as some familiarity with radio equipment.
You must also have knowledge of all radio frequency and electrical safety
practices and regulations that apply to the installation site.
How to Use This Manual
Each of the chapters and appendices in this manual begin with an introduction
to the contents of that portion of the manual. Before beginning the installation
process, you should read the introductions to each chapter so that you know
what each portion provides.
When you come to a procedure, skim through the entire procedure before
performing the step-by-step instructions. By doing this, you can prepare with
the appropriate information, equipment, and tools.
The information in this manual is organized according to the sequence of tasks
necessary to plan for unpacking, installing, and configuring, as well as operating
and maintaining the VoiceXtender modem.

AirLink VoiceXtender Modem Installer’s Guide
Preface
Rev. A - 8/97 xi
Title Description
Chapter 1
Introduction Provides a general description of VoiceXtender modems, including features and front and rear panel information.
Chapter 2
System Planning Provides information on configuration planning, path analysis, and typical applications.
Chapter 3
Installation and Setup Provides instructions on how install modems, configure the DIP switches, cable the equipment, and align the
antenna.
Chapter 4
Troubleshooting Provides information on troubleshooting and possible operational problems when using modems.
Appendix A
Specifications Provides information on general specifications and radio interface specifications.
Appendix B
Worksheets Assists in the system planning process by providing a means to note VoiceXtender configuration settings and
maintain a record of the settings.
Appendix C
Glossary Provides definitions for the terms commonly used throughout the manual.
Index Provides a quick reference to assist you in locating
important terms in the manual.

AirLink VoiceXtender Modem Installer’s Guide
Preface
xii Rev. A- 8/97
Manual Conventions
The procedures and instructions in this manual use the following conventions:
❚The two configuration switches on the unit are referred to as SW1 and SW2.
Each switch consists of 8 individual ON/OFF switches that are referred to
as SW1-1, SW1-2, SW2-1, SW2-2, etc.
❚The following notes are used to add information, point to other important
considerations, or alert you to possible risks to you, your equipment, or your
data.
NOTE These standard text notes highlight important or additional information for you to consider.
CAUTION These notes warn you of situations that could result in damage to your equipment or loss
of data if you do not heed the instructions.
WARNING These notes warn you of situations that could endanger your health or safety if you do not
heed the instructions.

AirLink VoiceXtender Modem Installer’s Guide
Preface
Rev. A - 8/97 xiii
Customer Support
If after reading this guide you encounter any trouble installing or using the
VoiceXtender modem, please contact your local distributor. If problems are not
resolved, you can call Cylink’s Customer Service for assistance. The telephone
numbers are:
Domestic (U.S.):
1-800-545-6608 Sunnyvale, CA
International:
1-408-735-5822 Sunnyvale, CA
[phone] Singapore
[phone] United Kingdom
[phone] India
[phone] Pakistan
Domestic and International Customer Service fax:
1-408-735-6641 Sunnyvale, CA
[phone] Singapore
[phone] United Kingdom
[phone] India
[phone] Pakistan
You can also contact Cylink’s Customer Support through the Internet at the
following email address:
[email protected]
If you need to return equipment, call Customer Service to obtain a return
material authorization (RMA) number prior to returning the equipment. The
RMA number must be on the outside of the shipping carton. When you call,
please be prepared to provide the unit serial number, software version, and a
detailed description of the problem.

AirLink VoiceXtender Modem Installer’s Guide
Preface
xiv Rev. A- 8/97
Return all equipment to:
Cylink Corporation
1350 Bordeaux Drive
Sunnyvale, CA 94089
Attn: Repair and Return Department
RMA No: xxxxxxxxxx
Reader Response
Cylink’s technical publications department wants its documents to meet your
requirements. To this end, your ideas about the documentation are valuable.
After you have had a chance to read and use the guide, we encourage you to
submit your comments to
Manager, Technical Publications
Cylink Corporation
910 Hermosa Court
Sunnyvale, CA 94086
You can also submit your comments through the Internet at the following
address:
[email protected]
Cylink may use or distribute any of the information you supply in any way it
believes appropriate without incurring any obligations whatsoever.

Rev. A - 8/97 1-1
C
CHAPTER HAPTER 1 1
Introduction
Introduction to the to the
VoiceXtender
VoiceXtender
This chapter contains an overview of the features and
applications of Cylink’s VoiceXtender modems, and includes
descriptions of the front and rear panels.
Inside this chapter:
ProductOverview.................................................................1-2
Applications............................................................................1-3
FrontPanel Description.......................................................1-4
RearPanel Description........................................................1-5

VoiceXtender Installer’s Guide
Introduction
1-2 Rev. A - 8/97
Product Overview
Cylink’s family of modems provide a wireless solution for data and voice
connectivity using spread spectrum technology (902 to 928 MHz frequency band).
VoiceXtender modems support 2-wire voice.
Figure 1-1
VoiceXtender

VoiceXtender Installer’s Guide
Introduction
Rev. A - 8/97 1-3
Features
VoiceXtender (VX) modems provide the following features:
❚ Increased modem data rate to 28.8 Kbps
❚ Enables the maximum performance through a voice modem-CODEX
connection
❚ Caller Number Delivery and Signaling
❚902 to 928 MHz operating frequency
❚Selectable channels
❚Selectable output power
❚Optional omnidirectional or directional antennas
❚Power on and radio synchronization status indicators
❚Hub (several co-located terminals) configurability
❚Adjustable audio receive (ear piece) level.
The VoiceXtender replaces the wired connection between a standard telephone
and the on-premises switch or centrex with a radio link. Both foreign exchange
station (FXS) and foreign exchange office (FXO) loop-start signaling are
supported. The VoiceXtender provides a standard ringer current for the
telephone ringer.
With the Caller Number Delivery feature, modulation is digitized by the VX
64 and converted at the receiving end within the specified three seconds.
Applications
VX modems can be configured for point-to-point applications to provide a radio
link between telephone devices. Several VX modems can be connected in a hub
configuration to allow even greater flexibility in the arrangement of telephone
equipment.

VoiceXtender Installer’s Guide
Introduction
1-4 Rev. A - 8/97
Front Panel Description
The front of the VoiceXtender modem contains two green visual indicators:
❚POWER—this indicator illuminates when the modem is plugged into
the power outlet and is receiving power.
❚SYNC—this indicator illuminates when the channel is ready for
transmission (the RF link is up). When this indicator is flashing, the
RF link is not well established. When this indicator is off, the RF link
is down.
Figure 1-2 shows the front panel of an VoiceXtender modem. For more
information on indicators, refer to the section entitled “System Startup” in
Chapter 3, “Installation and Setup.”
Figure 1-2
VoiceXtender(VX) Modem-Front Panel

VoiceXtender Installer’s Guide
Introduction
Rev. A - 8/97 1-5
Rear Panel Description
The VoiceXtender modem is easily configured using the configuration switches
located at the rear of the modem. All connections are also located at the rear as
shown in Figure 1-3.
The following list describes the items on the rear panel:
❚Antenna connector (ANT) is a female N-type connector for connection to
either an omnidirectional or directional antenna
❚Female BNC connector for burst synchronization signal (SYNC) to
connect the synchronizing unit to synchronized modems in a hub
configuration or slave unit to master unit in a repeater application
❚Two configuration switches, each consisting of eight individual
ON/OFF switches
❚RJ11-type modular connector for the line or phone connection
❚5-pin female DIN connector for the external power supply
❚System grounding stud
For information on applications, refer to Chapter 2, “System Planning.” For
information on cabling and switch settings, refer to Chapter 3, “Installation and
Setup.” Information on specific cable pin signals can be found in Appendix A,
“Specifications.”
Figure 1-3
VoiceXtenderModem-RearPanel