Telos ZephyrExpress User manual

Portable ISDN
Digital Audio Transceiver / Mixer
The Best Way to Hear from There™
User’s Manual
Manual Version: 1.0 / April, 1999
(v1.2.1 software)

ii Introduction
What you’ve got here:
ZephyrExpress is a portable, one-box solution for high-quality broadcast audio
remotes via ISDN. It combines a flexible stereo digital mixer, two stereo
monitor mixers, coder and decoder for international-standard audio data
compression, and an ISDN interface.
· You can plug microphones and a headphone in one end, an ISDN line in
the other, and you’re ready for instant two-way 20kHz stereo transmission
virtually anywhere in the world.
ZephyrExpress communicates with Telos’ Zephyr or another ZephyrExpress, or
with any other brand of codec using MPEG Layer 2, MPEG Layer 3, or G.722
algorithms. ISDN and audio setups can be pre-programmed for one-button
connection. ZephyrExpress can even call standard telephones via ISDN,
eliminating the need for a separate circuit and phone at the remote location.
(ISDN, by the way, is a telephone company technique for stuffing two bi-
directional 64kpbs channels on the same copper pair that was originally
designed for a single voice circuit. In many cases it can use existing wiring.
ISDN requires special terminators and synchronized terminal adapters, built in
to ZephyrExpress.)
· Actually, what you’ve got here is the Users’ Manual. It’ll tell you everything
you need to operate ZephyrExpress, how to order ISDN circuits and connect
to them, how audio coding work and how to choose its options, how to
maintain ZephyrExpress, and lots of tips and shortcuts for using the system
efficiently.
· There’s also a 40-page Mini-Manual with abbreviated operating instructions
and common questions about using ZephyrExpress. It’s designed to be kept
with the unit and taken to the remote broadcast.
· And there’s a 4-page laminated Field Guide, also intended to be kept with
ZephyrExpress.

Introduction iii
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 ZephyrExpress 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]

iv Introduction
Blank Screen?
If ZephyrExpress’ LEDs light when you first apply power but the LCD screen
appears dark, or the LCD screen lights but no characters appear, the last user
may have left its brightness or contrast at an extreme setting. To reset:
p
d
• Press the DROP button and hold that button in while turning the Edit
knob clockwise to reset the backlighting. It may take a few turns.
• Press the DIAL button and hold that button in while turning the Edit
knob either direction to change the LCD Contrast.
Test Lines
Telos Systems maintains ISDN test lines with continuously-playing music. Feel
free to dial into them from your ZephyrExpress to test your setup or line.
· USA: +216 781.9310, +216 781.9311 (Layer 3 Dual transmit @ 32 kHz sample
rate. Dial just one number to test Layer 3 Mono, or dial both numbers to test
Layer 3 Dual. You can also test Layer 3 Stereo by dialing both numbers; a
slight distortion of the stereo image may result because you’re receiving our
Dual test signal rather than true stereo. Your ZephyrExpress will work
correctly with a stereo transmission.)
· Germany: (49) 81 61 42 061 (Layer 3 Dual transmit @ 32 kHz sample rate; dial
once to test Layer 3 Mono, or dial twice to test Layer 3 Dual. The warning
about Layer 3 Stereo, above, applies.)
· Germany: (49) 81 61 42 062 (Layer 2 Mono @ 48 kHz; ZephyrExpress must be
set to Layer 2 receive. Only one line is required.)
hHOTTIP:
ZephyrExpress will dial a test line for you:
1) Verifythat the word Ready appears twice on the LCD screen. If it doesn’t, you
have an ISDN problem and can’t place a call. ISDN setup instructions appear in
this booklet.
2) Press the DIAL button
3) Turn the EDIT knob to select Auto... and tap the EDIT knob in toward the
panel to confirm that choice
4) Turn the EDIT knob to select a test line and tap the knob again
5) The word Go! will be highlighted on the screen. Tap the knob one more time,
and ZephyrExpress will place the call.

Introduction v
Updates
How ZephyrExpress works is almost entirely determined by software. This
booklet is based on software version 1.2.1.
Power Supply
ZephyrExpress is powered by a separate modular power supply, which is self-
adjusting to any voltage between 100 - 250 VAC, 50 - 60 Hz. It connects to a 4-pin
XLR connector on the rear panel. The supply must be turned off at its switch, or
disconnected from the AC line, before plugging or unplugging this XLR
connector.
eWARNING:
Do not use the XLR connector as an on/off switch!
Connecting or disconnecting the power supply while it is powered can erase
current ISDN setup and other user settings.
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 © 1999 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.

vi Introduction
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.
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.
WARNING: Toreduce the risk of electrical shock, do not expose this product
to rain or moisture. Avoid underwater remote broadcasts without adequate
protection.
eThis 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.
wThis symbol, wherever it appears, alerts you to important operating
and maintenance instructions. Read the manual.
eCAUTION
TO PREVENT RISKS OF ELECTRIC SHOCK, DISCONNECT
POWER CORD BEFORE SERVICING. w
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 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.
wCANADA 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.”

Introduction vii
Table of Contents
More comprehensive tables of contents, with page numbers, are at the start of each section.
A complete index follows section 11.
Section 1: Quick Results
Part I: Instant Gratification, or “How
to hear stereo music on a phone line”
Gather information about your ISDN line
Set up the hardware
Configure ZephyrExpress for your ISDN line.
Call yourself (testing your unit and the line)
Tune into one of our test lines
Part II: Fast Answers to Frequently-
Asked Questions
Section 2: What You’ve Got
Here...
THE BEST WAY TO HEAR FROM THERE™
Introducing ZephyrExpress
Features and Benefits
Introducing ISDN
ISDN Configurations
Introducing Audio Coding
About coding delays
About Layer 2 and Layer 3 Coding
Compatibility and proprietary coding
About Telos Systems
Making ZephyrExpress work for you
Section 3: ZephyrExpress
Hardware
About our hardware...
Front Panel
The Mixer Section
Display section
Control section
Rear Panel
Data connection section
Audio i/o section
Power connection
Section 4: Audio Operations
A console at your fingertips...
The Send Mixer
The Monitor Mixers
Receive Meters
LOCK lights
Analog (G.711) phone calls
Dealing with Delay
Section 5: Audio Coding
OVERVIEW
Introduction to Audio Coding
Basic Principles of Perceptual Coding
ISO/MPEG LAYER 3
Layer 3 Features
ISO/MPEG LAYER 2
G.722
CASCADING
CHOOSING THE CODING METHOD FOR
YOUR APPLICATION
Compatibility
Section 6: Menu Reference
The Menu System
Menu Overview
Using Setups
Applying a Setup
Creating or Changing a Setup
Master Setups
Applying a Master Setup
Creating or Changing a Master Setup
Autodial Setups
Menu Details
Codec menu
Audio menu
ISDN menu
System menu
Safe mode menu

viii Introduction
Section 7: ISDN Reference
ISDN BASICS
Background
The Basic Rate Interface (BRI)
HOW TO ORDER ISDN
ZephyrExpress ISDN Compatibility
Ordering: Central Office Switches and Protocols
Section 8: System Functions
Software Updates
ZephyrExpress data ports
The Serial Port
The Parallel Port
Section 9: Troubleshooting
First Steps
GENERAL
Thinking About Problem Solving
Diagnostic Aids
Some Error Conditions
ISDN Problems
Section 10: Schematics and
Data Sheets
Section 11: Appendix
ABOUT AUDIO LEVELS
CODEC COMPATIBILITY INFORMATION
Comprehensive ZephyrExpress Compatibility
List
FINDING PUBLIC ISDN SITES
List of Known Working SPIDs by Telephone
Company
ISDN BRI, ZEPHYR, AND YOU
Ordering ISDN
The Faxable ISDN Order Form (for use
in US only)

Introduction ix
A Note From the President...
Waaay back in 1984, Telos’ first product was being designed on a Radio Shack
TRS-80 and the attached modem was considered to be respectably state-of-the-
art, operating at the impressive speed of 300 bits per second. This was nearly
three times the speed of the 110 bps, twenty-five pound, phone company-issue
boxes I had been using over at the local college campus to talk to the hulking
IBM in the bomb-shelter basement.
The PC revolution had begun a few years back, so there were quite a few of
them around, but they were, except for by grace of these modems and
mainframes, islands. No one as yet had figured a way to link them up in any
practical way.
How the world has changed! Politicians talking up the “Information Super
Highway” have made the phrase a parody, and 10 Million bits per second LANS
are starting to be thought of as kind of slow.
We radio broadcasters have until recently been only just a bit ahead of computer
users a decade ago. Our stations mostly exist as islands, with what audio we get
from elsewhere coming from the mainframe-like satellites and networks.
But now come the liberating technologies that do for us what networking is
doing for computing: digital telephony and high-power audio data coding.
These make possible the instant dial-up transportation of audio from and to
anywhere in the modern world. Digital telephone interconnection is being
delivered to us via ISDN, and ISO/MPEG Layer III is the perfect coding method
to exploit it for high-fidelity audio.
ZephyrExpress is the next logical extension of our original high-quality audio
network transceiver, the Zephyr.
With Zephyr, we tried to bring together gracefully these technological pieces to
permit you to easily do that which was previously difficult or impossible. It is
my hope that it becomes, in your hands, an empowering tool for the creation of
a more interesting audio future. It’s a result of what were once my personal
passions, and what have now become what MBA types call our “core corporate
competencies,” Digital Signal Processing and telephones for broadcast. It feels
as if everything we’ve done until now have lead to this. Plug it in, dial it, listen,
and see if you, too, don’t share the excitement we felt in the lab when we got the
first prototype going, listening to a Zappa CD being played from our partner lab
in Europe. It was absolutely mind-boggling – we were hearing CD-quality audio
from the other side of the planet ... on a phone line.
God, I love this technology!
Steve Church

x Introduction
Notes About this Manual
ZephyrExpress and the studio Zephyr unit share a lot of features in common,
particularly in how they code audio and are connected to ISDN lines. In general,
things you already know or learn here about one unit will apply to the other.
We use the following symbols to draw your attention to particularly important
points.
eDANGER!
This symbol calls attention to the presence of dangerous voltages inside
ZephyrExpress.
wIMPORTANT!
This information is essential to getting ZephyrExpress to work, or to prevent
damage to it. Read these notes to avoid major headaches.
hHOT TIP!
This information will probably come in handy at some point. It’s a good
idea to read these tips.
iISDN TIP!
Important information about ISDN and ZephyrExpress’ built-in Terminal
Adapter. Recommended for all users.
cCOMPATIBILITY TIP!
Tips about operating modes, how to get the best results with other Telos
units, and particularly how to connect ZephyrExpress to other brands of
codec. You should read these.
tDEEP TECH NOTE!
Details about the intricacies of ZephyrExpress and ISDN and coding
technologies. Useful information for troubleshooting, and fascinating
reading for the technically-minded.
?CURIOSITY NOTE!
Amaze your friends with your grasp of ISDN and Coding trivia! Or just ignore
these notes. It’s up to you.

Introduction xi
Block Diagram

xii Introduction
Menu Structure
Utility Menu
Com
p
atibilit
y
Codec
Transmit
Receive
Bitrate
Sam
p
le Rate
Ancill Data
Status Out
Loop Mode
Contacts Out
Codec Setu
p
s
ISDN
Switch type
SPID #1
SPID #2
DN #1
DN #2
MSN #1
MSN #2
Outside Line
Panic Dial
Channel Assi
g
n
Safe Mode
Codec
Audio
ISDN
S
y
stem
Manual Dial
Autodial
Master
Autodial
Audio
Line Sensitivit
y
Mon 1 Xmt Pan
A Settin
g
B Settin
g
AB settin
g
A
AB settin
g
B
Mon 1 Rcv Pan
A Settin
g
B Settin
g
AB settin
g
A
AB settin
g
B
Mon 2 Xmt Pan
A Settin
g
B Settin
g
AB settin
g
A
AB settin
g
B
Mon 2 Rcv Pan
A Settin
g
B Settin
g
AB settin
g
A
AB settin
g
B
S
y
stem
LCD Contrast
LCD Backlight
Click Volume
POTS Volume
Menu Timeout
Baud Rate
Set Time
Software
About...
Microphones
Limiter Bypass
Mic 1
Sensitivity
Phantom Power
Low Cut Filter
Test Tone
Mic 1
Sensitivit
y
Phantom Power
Low Cut Filter
Test Tone

QUICK RESULTS 1-1
SECTION 1:
QUICK RESULTS
Part I: Instant Gratification, or “How to hear stereo music over a phone line” 1-2
Gather information about your ISDN line 1-3
Set up the hardware 1-5
Configure ZephyrExpress for your ISDN line. 1-7
Call yourself (testing your unit and the line) 1-9
Configure the Codec 1-9
Set up an audio input and output 1-11
Place the call to yourself 1-11
Tune into one of our test lines 1-13
Part II: Fast Answers to Frequently-Asked Questions 1-15
Blank Screen? 1-15
The Basics 1-15
1: What do I do if I’m totally lost? 1-15
2: How do I use the menus? 1-16
3: How do I use a menu that appears locked? 1-17
4: How do I lock a specific menu? 1-17
5: How do I enter numbers or names? 1-17
6: How do I create my own Setups and Master Setups? 1-18
7: How do I connect ZephyrExpress to an ISDN circuit? 1-19
8: How do I manually enter a network setup? 1-20
9: How do I test that I’ve set things up properly? 1-20
10: What do I do if I can’t connect? 1-21
11: How do I set ZephyrExpress for my microphones? 1-22
12: How do I use line-level sources? 1-22
13: How do I create a monitor mix? 1-23
14: How do I test my audio and compression setups? 1-23
15: How do I place a call? 1-24
16: What do I do if they can’t hear me? 1-25
17: How do I send a test tone? 1-26
18: How do I hang up? 1-26
19: Where do I find answers to other questions? 1-27

1-2 QUICK RESULTS
If you’re in a hurry...
This part of the manual will get you started quickly. It presents answers to the questions
that come up often when using ZephyrExpress. It’s not a thorough technical guide —
that’s what the rest of this book is about — but a way to get you through most operating
situations.
If you need to put the unit in service immediately, or have experience with Zephyr or
other similar ISDN codecs, this section may be all you need. It’s in two parts:
· Step-by-step instructions for configuring ZephyrExpress and dialing our test site.
You’ll be able to hear music in high-quality stereo as well as verify that
ZephyrExpress and the ISDN line are working properly.
· Answers to common questions about using ZephyrExpress in the field. This material
can also be found in our Mini-Manual.
cFAST TRACK! If you already know how to use a Zephyr, we recommend you read through the
next five or six pages. ZephyrExpress’ controls and menus work differently, and
the specific steps on these pages may be the fastest way to get acquainted with
them... even if you’re not interested in “Instant Gratification”.
Don’t ignore the rest of this book. Aside from the technical references, we’ve included
interesting and useful information on audio coding and digital telephony. They’ll help
you get the best results from your ZephyrExpress, teach you about a technology that’s
becoming more important with the advent of digital broadcasting and Internet webcasts,
and provide you with tons of tidbits you can use to impress others.
Part I:
Instant Gratification, or
“How to hear stereo music over a phone line”
This section is for you if you:
· Know how to dial a telephone call.
· Are not intimidated looking at the front panel of ZephyrExpress.
· Have Basic ISDN1, a switched digital service provided by the telephone company.
ISDN allows two simultaneous connections on a single circuit — like having two
simultaneous analog calls on a single copper pair. The circuit may show up as a
standard telephone jack, an 8-pin RJ-45 jack, or even a pair of screw terminals or
copper wires. US users should contact their telephone company to verify that the line
1Also known as a BRI or a 2B+D line. ZephyrExpress is not designed to be used with PRI,
Switched 56, or fractional T-1 lines.

QUICK RESULTS 1-3
was installed exactly as specified in the ISDN order instructions found at Telos’ web
site and at the end of this manual.
· Have circuit information supplied by the phone company. This must include the
type of switch on the circuit and the telephone number(s)1. In the US, it will probably
also include two SPID numbers. In Europe, it may include MSN numbers.
· Have a ZephyrExpress, a microphone, and a pair of stereo headphones or other
audio monitor.
· Understand that these instructions are just to get you started and will not answer all of
your questions or demonstrate all of the features of ZephyrExpress.
· Promise to read the full manual later.
Now, let’s get started.
Gather information about your ISDN line
Analog telephones are simple: all a phone needs to do is tap into a line, and it’ll probably
start working immediately.
ISDN is more complicated. Before any ISDN device can receive or transmit signals, it has
to be matched to central office settings for that particular circuit. These settings include
line identification numbers and a communication protocol.
Your ISDN circuit consists of two digital lines, and both can operate at the same time on a
single copper pair. Each line has an identification number, which may (or may not) be its
telephone number. Sometimes, both lines will use the same identification number.
The phone company’s equipment expects ZephyrExpress — or any other ISDN terminal
equipment — to know the right identification numbers for the circuit it’s connected to,
and to transmit them on demand. If the proper identification numbers aren’t entered
into the equipment, you won’t be able to place or receive calls.
In North America, these numbers take the form of Service Profile Identification (SPID)
numbers: If you’re given SPIDs, they must be programmed into ZephyrExpress.
The two lines also have standard telephone numbers, which users of other ISDN
equipment will dial to call your ZephyrExpress. Unlike regular telephone lines, both lines
may have the same telephone number assigned to them.
European telephone systems don’t use SPID. They may use optional Multiple Subscriber
Numbers (MSNs) to limit which lines will be answered. If you put two MSNs into
ZephyrExpress, the unit will answer calls only on those lines.
Confused? Here are some rules of thumb:
1There can be one or two standard phone numbers for a US circuit, and may be more
than two for a European one.

1-4 QUICK RESULTS
1. If you’re given two SPIDs by the phone company, enter just those numbers into
ZephyrExpress. This is the most common case in North America.
2. If you’re given just one SPID, don’t enter it: instead, use the PTP setting for Switch
Type.
3. If you’re in Europe you don’t have to enter anything. However, if you’re given MSNs
and want to limit which numbers ZephyrExpress will answer, enter them for those
numbers.
There are also several different types of ISDN switching devices that can be used at the
central office, each with a different set of protocols. You must know what type you have.
iISDN TIP! If you have AT&T Point-to-Point protocol or European ISDN, the phone company
might provide just one number for the MSN or Directory Number.
These numbers, and possibly also the protocol, will be different for each ISDN circuit
you connect to. Since ZephyrExpress is portable, it’s likely to be used in multiple
locations. You can enter the complete information for each location into ZephyrExpress,
and recall its complete setting at the touch of a button.
Here’s a summary of circuit information. You may want to copy this form for each location.
Item 1 and 2 are required. Use just one set of numbers for item 3. Item 4 is optional.
Location___________________________________________ Date ______________________
1 ISDN type, check one:
❐National ISDN-1 (The most frequent choice in the US. Will always have SPIDs. Also
use this choice if your ISDN protocol is DMS Custom.)
❐AT&T Point-to-Point or PTP. (Will not have SPIDs.)
❐European ISDN (Euro-ISDN or ETS300. Will not have SPIDs.)
❐Other (Contact Telos Customer Support.)
2 ISDN telephone numbers with area code:
Line 1 _______________________________ Line 2 ___________________________________
3 SPID numbers, if supplied (US users only with National ISDN-1):
Line 1 _______________________________ Line 2 ___________________________________
or MSN numbers, if supplied (Euro ETS300 only):
Line 1 _______________________________ Line 2 ___________________________________
4Prefix required by internal phone system for outside lines:

QUICK RESULTS 1-5
Set up the hardware
You’ll need:
· A ZephyrExpress
· The ZephyrExpress Modular Power Supply with an appropriate power cord for your
local AC supply. The supply is self-adjusting for any voltage between 100 - 250 VAC,
50 - 60 Hz. It connects to a 4-pin XLR connector on the rear panel. The modular
supply must be turned off at its switch, or disconnected from the AC line,
before plugging or unplugging its XLR connector.
You may connect the power supply to ZephyrExpress now, and then apply AC power
and turn it on. The screen and all the LEDs will light up. After a few seconds, you
should see the word Status on the top of the screen. If the screen goes dark or totally
blank, see page 1-15 of this chapter.
wWARNING! Do not use the XLR connector as an on/off switch!
Connecting or disconnecting the power supply while it is powered can erase
current ISDN setup and other user settings.
· An NT1 (also called a Network Termination Unit) with connection cables. All of the
connection cables have telephone-type modular connectors and come packaged
with your Zephyr. There are three ways your NT1 can be present:
1. ZephyrExpress units sold in North America have a built-in NT1. If you see two
modular-type telephone jacks on the back of your ZephyrExpress, the lower jack
is the NT1. It’s marked Uand LINE DIRECT. It uses a standard analog telephone line
cord (type RJ-11 or RJ-14).
If you have this kind of NT1 and a North American ISDN installation, you may
connect them now. If the telco provided a large 8-pin (RJ-45) jack, you should
still use the standard line cord: plug it into the middle of the jack, and it’ll find
the right conductors.
2. Most European and Asian telephone companies provide the NT1 as part of their
installation. It uses a large eight-conductor telephone plug (RJ-45), the same as
computer 10Base-T ethernet.
If you have this kind of NT1 and a European ZephyrExpress with only one
telephone jack on the back panel, you may connect them now.

1-6 QUICK RESULTS
wWARNING!
ZephyrExpress units sold in North America provide power for an external NT1. If
you’re using one of these, disconnect any other power supply connec-
ted to the NT1. If both ZephyrExpress and the NT1 are providing power, both
will be damaged.
You can tell if a ZephyrExpress will supply power by looking at the ISDN
connections: if there are two telephone jacks, it’s a North American unit and
you must follow the above precaution. If there’s only one telephone jack, it’s a
European unit and can be connected safely to powered NT1s.
European units are also marked with this Euro Telecom logo on the rear panel.
If you’re using a North American ZephyrExpress with two telephone jacks, and a
European or Asian NT1, disconnect the NT1’s power supply! Once you have
done this, you may connect an eight-conductor cable to the NT1. If you can’t
disconnect the NT1’s power supply, contact Telos Customer Service before
proceeding.
3. If you’re using a European ZephyrExpress in North America, you’ll need an
external NT1. It’s about the size of a small book, has some telephone-type
connectors, and usually has some little indicator lights. You’ll need two cables:
The first is a large, telephone-type modular cable with eight wires that fits into
the single jack on the Zephyr and a jack on the NT1 that is labeled “Terminal.”
The second is a telephone-type modular cable that fits into the jack on the NT1
that is labeled “Line” and the jack provided by the telephone company.
If you’re using this kind of NT1, you may connect the two telephone cables now.
The external NT1 has its own power supply. Do not use the external NT1’s
power supply if your ZephyrExpress has two telephone jacks on the back. If
your ZephyrExpress has only one telephone jack, you may connect the NT1’s
power supply now.
· You’ll also need a microphone, a mic cable with an XLR male plug, and a stereo
headphone with a standard 1/4” tip/ring/sleeve plug.

QUICK RESULTS 1-7
Configure ZephyrExpress for your ISDN line.
hHOT TIP! There are two boxes on the bottom of ZephyrExpress’ screen.
If you see the word Ready in both of them, your unit is probably already
configured for the ISDN line. Skip this step, and go right to “Calling Yourself” on
page 1-9.
If you see the word inact in both of them, your unit is not connected to a
working ISDN circuit. Recheck your connections.
iISDN TIP! You can check ISDN continuity with an ordinary analog telephone or a pair of
600Ω headphones. Disconnect ZephyrExpress, and briefly place the phone (or
phones) across the line. You should hear either a rhythmic clicking — about
once per second — or a loud, continuous white noise. If you hear a dial tone, it’s
not an ISDN circuit. If you don’t hear anything, the line is dead.
ZephyrExpress is configured by pressing the UTIL button, using the EDIT knob to select
menu items, and tapping the EDIT knob in towards the panel to confirm choices. The
process is intuitive, and you should be able to configure your unit with a minimum of
instructions. But if you get lost, see the instructions on page 1-16.
To configure ZephyrExpress for a particular line, first make sure you have the
information about that line from page 1-4.
uPress the UTIL button.
The LCD display will change
to look like this:
Lost already?
If you don’t see something that says Utility Screen at the top, don’t panic. Just turn the
EDIT knob counterclockwise until it appears.
If the second line of the screen says something other than System Defaults, don’t worry.
If you don’t see anything at all on the screen, but you know ZephyrExpress is getting
power (because some LEDs are on):
If the screen is dark, press the DROP button and hold it in while turning the EDIT
knob clockwise to reset the backlighting. This may take a few turns.
If the screen is lit, press the DIAL button and hold it in while turning the EDIT knob
either direction to chance the LCD contrast.

1-8 QUICK RESULTS
UTurn the EDIT knob three clicks clockwise, to highlight ISDN.
TThen tap the knob in toward the panel.
The display will change to look like this:
Turn the edit knob clockwise to highlight either SPID#1, DN#1, or MSN#1, depending on
which type of number you entered in the form on page 1-4. The menu scrolls down as
you keep turning the knob.
Tap the edit knob in toward the panel again to start entering that number.
The display will change to look something like this, depending on what kind of number
you’ll be entering.
Use the numeric keys to enter the number.
Enter exactly the digits the phone company supplied you with. Leading and trailing zeros
are important. If you make a mistake, you can turn the EDIT knob counterclockwise to
back up.
Once the number is completely entered, tap the EDIT knob toward the panel to confirm.
Turn the knob one click clockwise to highlight SPID#2, DN#2, or MSN#2. Tap the knob,
then enter that number the same way. When you’re done entering the number, tap EDIT
to confirm.
If this line requires a prefix to reach an outside line (item 4 on the form on page 1-4), turn
the knob clockwise to highlight Outside line prefix. Then enter the prefix the same
way you’ve entered the line identification numbers, and tap the knob to confirm.
DTurn the EDIT knob counterclockwise to go back up to Switch Type, and tap it toward the
panel. The screen will look like this. If you’ve entered a SPID#1, you should see it also.