Telos Zephyr User manual

Digital Network Audio Transceiver
The Best Way to Hear from There™
User’s Manual
Manual Version: 3.0,
November, 1997

2
Customer Service
We support you...
•By phone/Fax in the USA.
Customer service is available from 9:30 AM to 6:00 PM USA Eastern Time, Monday
through Friday at +1 216.241.7225. We’re often here at times outside of these, as well –
please feel free to try at any time!
Fax: [phone].
•By phone/Fax in Europe.
Service is available from Telos Europe in Germany at [phone].
Fax: [phone].
•By E- Mail.
The address is: [email protected].
•Via World Wide Web.
The Telos Web site has a variety of information which may be useful for product
selection and locating other compatible users. The URL is: http://www.zephyr.com.
Feedback
We welcome feedback on any aspect of the Zephyr or this manual. In the past, many
good ideas from users have made their way into software revisions or new products.
Please contact us with your comments.
Telos Systems
2101 Superior Avenue
Cleveland, OH 44114
USA
+1 216.241.7225
Fax: [phone]
Telos Europe
JohannisstraBe 6
85354 Freising
Germany
[phone]
Fax: [phone]

Test Lines
To aid you in testing and demonstrating your Zephyr Telos Systems has the following
test numbers available:
•USA: +216 781.9310, +216 781.9311 (Layer III Dual transmit @ 32 KHz sample rate)
•Germany: (49) 81 61 42 061 Dial this number twice (Layer III Dual transmit @ 32
KHz sample rate)
•Germany: (49) 81 61 42 062 (Layer II Mono @ 32 KHz)
Updates
The operation of the Zephyr is nearly entirely determined by software. A continuous
program of improvement is underway. Please be sure to send in the registration form to
be notified of new software releases.
Trademarks
Telos Systems, the Telos logo, Zephyr, ZephyrExpress, and “The Best Way to Hear from
There” are trademarks of TLS Corporation. All other trademarks are property of their
respective holders.
Copyright
Copyright © 1994- 97 by TLS Corporation. Published by Telos Systems, who reserves the
right to make improvements or changes in the products described in this manual,
which may affect the product specifications, or to revise the manual without notice. All
rights reserved.
Notice
All versions, claims of compatibility, trademarks, etc. of hardware and software
products not made by Telos mentioned in this manual or accompanying material are
informational only. Telos Systems makes no endorsement of any particular product for
any purpose, nor claims any responsibility for operation or accuracy.
Warranty
This product is covered by a one year limited warranty, the full text of which is in the
Appendix section.
Repairs
You must contact Telos before returning any equipment for repair. Telos Systems will
issue a Return Authorization number which must be written on the exterior of your
package. Be sure to adequately insure your shipment. Packages without proper
authorization may be refused. US customers should contact Telos customer support at
+1 216.241.7225. All other customers should contact their local Telos Dealer who will
verify the problem and will contact Telos and arrange for repair.

Table of Contents4
CAUTION: The installation and servicing instructions in this manual
are for use by qualified personnel only. To avoid electric shock, do
not perform any servicing other than that contained in the operating
instructions unless you are qualified to do so. Refer all servicing
to qualified personnel.
IMPORTANT NOTE! The Zephyr memory backup is powered by Lithium
battery BT-1. The following precautions must be followed when working
on the Zephyr motherboard or when this battery is replaced:
1) Do not short the battery terminals (or traces connected to these
terminals) together.
2) Lithium batteries contain lithium and may be considered hazardous.
Local procedures must be followed when disposing of used batteries.
Do not dispose this battery by burning.
3) Do not attempt to open the sealed battery container.
WARNING: To reduce the risk of electrical shock, do not expose this
product to rain or moisture. Do not shower with the unit.
This symbol, wherever it appears, alerts you to the presence
of uninsulated, dangerous voltage inside the enclosure –
voltage which may be sufficient to constitute a risk of shock.
This symbol, wherever it appears, alerts you to important
operating and maintenance instructions. Read the manual.
USA CLASS A COMPUTING DEVICE INFORMATION TO USER. WARNING:
This equipment generates, uses, and can radiate radio-
frequency energy. If it is not installed and used as directed
by this manual, it may cause interference to radio
communication. This equipment complies with the limits for a
Class A computing device, as specified by FCC Rules, Part 15,
Subpart J, which are designed to provide reasonable
protection against such interference when this type of
equipment is operated in a commercial environment. Operation
of this equipment in a residential area is likely to cause

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interference. If it does, the user will be required to
eliminate the interference at the user’s expense. NOTE:
Objectionable interference to TV or radio reception can occur
if other devices are connected to this device without the use
of shielded interconnect cables. FCC rules require the use of
only shielded cables.
CANADA WARNING: “ This digital apparatus does not exceed the
Class A limits for radio noise emissions set out in the Radio
Interference Regulations of the Canadian Department of
Communications.” “ Le present appareil numerique n’emet pas
de bruits radioelectriques depassant les limites applicables
aux appareils numeriques (de les Class A) prescrites dans le
Reglement sur le brouillage radioelectrique edicte par le
ministere des Communications du Canada.”

Table of Contents6
User’s Manual
Telos Zephyr
TELOS ZEPHYR 1
User’s Manual 6
Conventions Used in this Manual 12
QUICK RESULTS! (SECTION 1) 13
WHO CAN USE THIS SECTION? 14
WHAT YOU NEED BEFORE YOU START... 15
Hardware 15
Information on your ISDN line 16
SUCCESS, STEP-BY-STEP: 18
Connecting The Input/Output Audio 18
Connecting to The ISDN Line 18
Powering Up 19
Basic Configuration 19
Placing Your First Call (to Yourself) 22
Your Next Call, to Telos 23
What’s Next? 24
Where to find answers to frequently asked questions 25
INTRODUCTION (SECTION 2) 27
THE BEST WAY TO HEAR FROM THERE™ 28
Introducing Zephyr 28
Features and Benefits 29
Overview: Zephyr, the Box 31
Ordering Guide 32
Zephyr Transmission Modes 32
Introducing ISDN 33
Questions and Answers About Audio Coding 35
About Telos Systems 37

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ZEPHYR AT A GLANCE (SECTION 3) 39
FRONT PANEL 40
Display 40
Status LEDs 40
LCD and Pushbuttons 41
REAR PANEL 41
Slot Positions 41
ISDN 41
V.35/X.21 43
Send (Input) Audio 44
Receive (Output) Audio 46
Phones 47
RS-232 47
Parallel Port 48
AES/EBU 50
Remote Panel 51
AC Power 51
INSTALLATION & BASIC OPERATION (SECTION 4) 53
INTRODUCTION 54
CONNECTING TO ISDN 54
The U and S/T Interface (USA) 55
The S/T Only Interface (Europe and Elsewhere) 57
CONNECTING AUDIO 58
LCD AND PUSHBUTTONS 58
Status Screen 58
Getting Help 59
Using The Menu System 60
Setup to the ISDN Line 63
Making A Call 68
Using Auto Dial 73
Storing Setups 75
Calls To A Regular Phone 76
SETTING AUDIO CODING MODES 78
Transmit (Xmt) and Receive (Rcv) Modes 78
Bitrate and Sampling Rate 78
Dual Site Operation 79
Zephyr Xmt-To-Rcv Mode Compatibility Table 79

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DEALING WITH DELAY 80
Mix-Minus 80
Phones and Remotes 81
AES/EBU 82
ISDN (SECTION 5) 85
ISDN BASICS 86
Background 86
The Basic Rate Interface (BRI) 87
HOW TO ORDER ISDN 90
Zephyr ISDN Compatibility 93
Ordering: CO Switches and Protocols 94
NON-ISDN NETWORKS (SECTION 6) 97
SWITCHED 56 98
MORE NETWORK OPTIONS 99
Primary Rate ISDN 99
Digital Data Service (DDS) 99
Other Possibilities 99
USING THE ZEPHYR WITH NON-ISDN NETWORKS 99
V.35/X.21 Network Connection 99
AUDIO CODING (SECTION 7) 105
OVERVIEW 106
Introduction to Audio Coding 106
Basic Principles of Perceptual Coding 106
ISO/MPEG LAYER III 108
Layer III Features 109
ISO/MPEG LAYER II 110
G.722 111
CASCADING 112
CHOOSING THE CODING METHOD 114
MOST APPROPRIATE TO YOUR APPLICATION 114
Audio Coding Comparison Chart 114

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DETAILED MENU REFERENCE (SECTION 8) 119
MENU OVERVIEW 120
Menu Summary 120
Using the Menus 121
DETAILED MENU REFERENCE 121
Utility Menu 122
Dial Menu 149
Auto-Dial Menu 151
Drop Menu 152
Volume Menu 153
Help Menu 154
Special Start-up Functions 156
Utility Menu - The Complete Works 146
REMOTE CONTROL (SECTION 9) 157
CONNECTING TO A COMPUTER 158
SYNTAX USED IN THIS MANUAL 160
COMMANDS AND FUNCTIONS 160
Ancillary Data 171
Startup Commands 172
MS WINDOWS ZephyrControl SOFTWARE 173
PARALLEL PORT AND CLOSURES 174
ADVANCED PROBLEM SOLVING (SECTION 10) 177
GENERAL 178
Thinking About Problem Solving 178
ISDN-RELATED 185
DETAILED TECHNICAL INFORMATION (SECTION 11) 197
PHILOSOPHY 198
DSP CARDS, CONFIGURATION, MODES 198
Transmit Modes 199
Receive Modes 202
GAINING ACCESS 203
COMPONENT-LEVEL CIRCUIT DESCRIPTION and TROUBLESHOOTING 205
General 205

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Circuit Description: Rev. F and Below 205
FIRMWARE EPROMS 218
SCHEMATICS (SECTION 12) 219
SCHEMATICS 220
MANUFACTURER’S DATA SHEETS (SECTION 13) 221
MANUFACTURER’S DATA SHEETS 222
SPECIFICATIONS AND WARRANTY (SECTION 14) 223
SPECIFICATIONS 224
ZEPHYR LIMITED WARRANTY 227
APPENDICES (SECTION 15) 229
ABOUT AUDIO LEVELS 230
CODEC COMPATIBILITY INFORMATION 232
FINDING PUBLIC ZEPHYR SITES 240
ISDN BRI, ZEPHYR, AND YOU 248
Ordering ISDN 248
List of Known Working SPIDs by Telephone Company 242
MENU’S AT-A-GLANCE; Utility Menu Summary 245
FAXABLE ISDN BRI LINE ORDER FORM 261