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Telos ZephyrExpress User Manual

Portable isdn digital audio transceiver / mixer
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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)
™

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Summary of Contents for Telos ZephyrExpress

  • Page 1 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) ™...
  • Page 2 · 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.

  • Page 3: Customer Service

    – please feel free to try at any time! Fax: +1 216.241.4103. · By phone/Fax in Europe. Service is available from Telos Europe in Germany at +49 81 61 42 467. Fax: +49 81 61 42 402. · By E-Mail.
  • Page 4 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.) HOT TIP:...

  • Page 5: Warranty

    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.
  • Page 6 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.

  • Page 7: Table Of Contents

    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...
  • Page 8 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...
  • Page 9 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...

  • Page 10: Notes About This Manual

    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.

  • Page 11: Block Diagram

    Block Diagram Introduction...

  • Page 12: Menu Structure

    Menu Structure Utility Menu Codec Transmit Receive Bitrate Sample Rate Compatibility Ancill Data Status Out Loop Mode Contacts Out Codec Setups System LCD Contrast LCD Backlight Click Volume POTS Volume Menu Timeout Baud Rate Set Time Software About... Safe Mode Codec Audio ISDN...
  • Page 13 5: How do I enter numbers or names? 6: How do I create my own Setups and Master Setups? 7: How do I connect ZephyrExpress to an ISDN circuit? 8: How do I manually enter a network setup? 9: How do I test that I’ve set things up properly? 10: What do I do if I can’t connect?

  • Page 14: Part I: Instant Gratification, Or "How To Hear Stereo Music Over A Phone Line

    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 Also 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.

  • Page 15: Gather Information About Your Isdn Line

    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) also include two SPID numbers.
  • Page 16 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.

  • Page 17: Set Up The Hardware

    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.
  • Page 18 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.

  • Page 19: Configure Zephyrexpress For Your Isdn Line

    EDIT If the second line of the screen says something other than 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 knob clockwise to reset the backlighting.
  • Page 20 Turn the knob three clicks clockwise, to highlight EDIT Then tap the knob in toward the panel. The display will change to look like this: Turn the edit knob clockwise to highlight either which type of number you entered in the form on page 1-4. The menu scrolls down as you keep turning the knob.

  • Page 21: Call Yourself (Testing Your Unit And The Line)

    Call yourself (testing your unit and the line) Before you call our test lines, make sure ZephyrExpress is working properly with the phone system. The easiest way to do this is to place a call on one of your ISDN lines, through the telco’s central office, and back to yourself!
  • Page 22 Tap the knob towards the panel to confirm that choice. The display will change to look like this: Turn the knob one click clockwise, to select the first text line ( above, but the text may be different on your ZephyrExpress). Tap the knob in towards the panel to confirm. Turn the knob to select...

  • Page 23: Set Up An Audio Input And Output

    Talk into the mic, and raise its volume control until you see a good level on the top two meters in the middle of the front panel. If you can’t adjust the mic for a good level, or the letters are turning red on peaks, you’ll have to change ZephyrExpress’ input sensitivity : see page 1-22.
  • Page 24 The Tap the knob to place the call. Edit In a few seconds, ZephyrExpress will beep twice to indicate the connection has been made. The two red they don’t, verify that the status screen shows (see page 1-9).

  • Page 25: Tune Into One Of Our Test Lines

    Tap the knob to confirm. After you tap, the highlighting will switch to the If ZephyrExpress’ codec is not already set to the correct mode to receive the testline, the unit will automatically change to match. This may take a few seconds.
  • Page 26 When you’re finished listening, press the You’ll see a screen like this: The word will already be highlighted. Tap the Both ZephyrExpress will hang up. 1-14 QUICK RESULTS routing button until the letters MONITOR 2 RECEIVE Monitor 2 Receive button...

  • Page 27: Part Ii: Fast Answers To Frequently-Asked Questions

    Of course, the rest of this manual will tell you a lot more about ZephyrExpress, teach you how to use the system more efficiently, and turn you into an all-around ISDN and audio coding guru.

  • Page 28: 2: How Do I Use The Menus

    How do I use the menus? ZephyrExpress uses a series of nested menus to set how it works. To open the menu system, press the list of submenus, will appear: Scrollbar Highlighted Item To access any menu item, turn the moves up and down to show how far through the list you’ve gone.

  • Page 29: 3: How Do I Use A Menu That Appears Locked

    A small screwdriver blade will help you reach the switch. Don’t use a pencil to change the setting — the graphite tip might break off, and cause a short within ZephyrExpress. NOTE: Don’t turn off Safe Mode unless you know what you’re doing.

  • Page 30: 6: How Do I Create My Own Setups And Master Setups

    If you select you’ll see a list where you can choose individual Setups that will be activated for each of ZephyrExpress’ menus. After you’ve selected these setups, scroll back to the field to create the new master setup. If you select automatically selected.

  • Page 31: 7: How Do I Connect Zephyrexpress To An Isdn Circuit

    ZephyrExpress sold in North America provide power for an external NT1. If you’re using one of these, disconnect any other power supply connected 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...

  • Page 32: 8: How Do I Manually Enter A Network Setup

    5. When your second number is completely entered, tap the box. Tap again, and ZephyrExpress will use line 1 to call its own line 2. Once you’re successfully connected, play some audio routed to both channels or use the built-in tone generator (page 1-26).

  • Page 33: 10: What Do I Do If I Can't Connect

    LED is lit, make sure the transmit and receive coding methods LOCK match (see page 1-9). If you’re calling a Telos test line, try dialing manually using the numbers on page 3 of this booklet. If you can’t connect to a distant studio, try having them call you.

  • Page 34: Audio Setup

    · Microphones The phantom power selection is remembered even while ZephyrExpress is unplugged. When you finish a remote broadcast, turn phantom power off as a courtesy to the next user.

  • Page 35: 13: How Do I Create A Monitor Mix

    (page 1-22), and set it for HOT TIP: The Line inputs do not pass through ZephyrExpress’ built-in limiter. If you’re using a line-level source that might have extreme peaks and want to avoid distortion through the codec, connect it through the microphone inputs with the mic limiter turned on.

  • Page 36: Isdn Connection

    If any menu setups were preprogrammed with that Autodial setup, ZephyrExpress will apply them before placing the call. This may change the coding method, audio setups, or even ISDN setup and system behavior depending on how it was programmed.

  • Page 37: 16: What Do I Do If They Can't Hear Me

    You don’t have to use any special settings for the studio to call you. If an analog call is received on one of the ISDN lines, ZephyrExpress will automatically connect and switch that line to Phone mode for the duration of the call.

  • Page 38: 17: How Do I Send A Test Tone

    2. Are they set to a receive coding method that matches your send method? Try changing Codec 3. Try changing the but not the other. 4. If you're working in stereo, make sure both ISDN lines are connected. If one of them hasn't been dialed or has dropped the connection, they won't hear a single channel of audio —...

  • Page 39: Where Do I Find Answers To Other Questions?

    Should I use Layer III, Layer II, or G.722? What other codecs are compatible? How should they be configured? How can I connect the ZephyrExpress to a computer or remote control? How do I contact Telos? Connector Pin-outs? Specifications?
  • Page 40 2B+D · 1-2 analog calls · 1-2, 1-25 audio setup · 1-10 Autodial · 1-18, 1-19, 1-24 Basic ISDN · 1-2 BRI · 1-2 call yourself · 1-11 calling · 1-20 circuit information · 1-4 coding methods · 1-21 directory number · 1-20 display ·...
  • Page 41 safe mode · 1-17 sensitivity · 1-22 setup · 1-5, 1-16, 1-18, 1-21, 1-24 SPID · 1-3, 1-4, 1-8, 1-20 status screen · 1-10, 1-20 test · 1-9 QUICK RESULTS test lines · 1-9, 1-21 testline · 1-21 text entry · 1-16, 1-17 troubleshooting ·...

  • Page 42: Hardware

    SECTION 3 EPHYR HARDWARE About our hardware... Front Panel The Mixer Section Send Mixer Monitor Mixers Display section Send and Receive Meters Lock LEDs LCD Display Blank Screen? SAFE indicator Control section Edit knob DIAL button DROP button UTIL button HELP button Numeric Keypad Rear Panel...

  • Page 43: About Our Hardware

    Monitor 2 Local Level Headphone Jack to Monitors ZephyrExpress has a self-test function for the front panel LEDs: all of the indicators, plus every segment of the VU meters, should glow for a few seconds when you first apply power. EPHYR...

  • Page 44: The Mixer Section

    The Mixer Section Mic 1 Gain Assign LEDS Routing Switches Monitor 2 Headphone Jack Send Mixer Mic 1 and Mic 2 Routing Switches Press these buttons to cycle whether each mic’s signal will be sent to channel , both channels, and off. The letters above each button will light up in green to indicate which channels are selected.

  • Page 45: Monitor Mixers

    HOT TIP! If you need line inputs with separate gain or routing controls, you can convert either or both microphones to line level: set the adjustments to Level Controls The three large knobs, with black caps, control the send level for their respective inputs. MIC 1 MIC 2 Monitor Mixers...

  • Page 46: Display Section

    HOT TIP! ZephyrExpress provides a digital conversion circuitry, and help distant studios test their codec and the line. When this mode is active, the meters are turned off; the middle LED of each meter will light steadily as a reminder that normal operation won’t be possible...

  • Page 47: Lcd Display

    System 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:...

  • Page 48: Control Section

    SAFE is blinking, it may mean that someone left ZephyrExpress in one of its loopback SAFE modes when they last turned the system off. Normal operation will be impossible until you use the menu to turn .

  • Page 49: Dial Button

    Select Manual... since turning ZephyrExpress on, the last number entered will already be in the Manual dialing screen; you can use it or replace it with something else. Select to choose from a pre-programmed list of places to call. Automatic dialing Auto...

  • Page 50: Drop Button

    ISDN or analog phone call, regardless of whether you placed DROP it or someone else called your ZephyrExpress. The display will show the drop selection screen: If only one line is in use, it will be pre-selected when the screen appears (such as above).

  • Page 51: Rear Panel

    NT-1 Adapter SAFE switch Line sync indicator Note: This picture shows the back of a ZephyrExpress intended for sale in North America. Units shipped elsewhere will have only the upper NT1 phone jack, and no Line Sync indicator. 3-10 EPHYR XPRESS HARDWARE .

  • Page 52: Data Connection Section

    IMPORTANT! Don’t attempt to move the SAFE MODE switch with a pencil. if the point breaks off, a piece of conductive graphite may fall inside ZephyrExpress where it will probably cause a short. Software Options These switches are reserved for future functions.
  • Page 53 The S interface is a standard modular RJ-45 style jack. Ethernet 10Base-T cables work best for this application, and are available at most computer stores. If you’re using a European ZephyrExpress in North America, you’ll need to provide your own NT1 and connect its Terminal jack to the S interface.

  • Page 54: Remote Control Jacks

    The LED is not supplied on units shipped outside of North America. Remote Control jacks ZephyrExpress has two computer-style jacks on the back panel. A DB-9 is used for serial RS-232 communication with the system, and a DB-15 is used for parallel contact closures and logic-level inputs.

  • Page 55: Parallel Port

    3 and 4 in the cable. Parallel Port The parallel port functions are not available as of ZephyrExpress software version 1.2.1. If you’re using a subsequent update that supports the parallel port, here’s how it’s wired:...

  • Page 56: Audio I/O Section

    (no more than +24 v) and connect that supply’s ground to the port’s ground on pin 1. WARNING! LEDs and low-voltage relays connected to ZephyrExpress’ power supply need a current-limiting resistor in series. Audio i/o section...

  • Page 57: Microphone Inputs

    ZephyrExpress XLR connectors are electronically balanced with pin 1 ground, pin 2 hot, and pin 3 return. Line inputs are bridging, high-impedance. Outputs are active-differential balanced, at a nominal +4dBu; an external resistive pad may be necessary for consumer amplifiers.

  • Page 58: Line Inputs

    ZephyrExpress is being used as a remote receiver only. If you want to hear the local microphones through these outputs, they have to be sent back from the distant studio (which will result in coding delays).

  • Page 59: Power Connection

    Power connection Serial Number From Power Power Supply Jack The 4-pin XLR connector is designed to be used with ZephyrExpress’ modular power supply. WARNING! Be sure the supply is turned off at its switch, or disconnected from the AC line, before plugging or unplugging this connector.

  • Page 60: Power Input

    Power Input Power Supply A separate modular power supply is provided with ZephyrExpress. Make sure it is not turned on, or check to make sure it isn’t connected to an AC line. Then plug its 4-pin XLR connector into the jack on the right side of the rear panel.
  • Page 61 LED is dark before plugging or unplugging its XLR connector. Connecting or disconnecting the modular supply while powered can erase memory settings or even damage ZephyrExpress. NOTE: WARNING! There are no user-serviceable parts in the power supply. Do not attempt to open it, as hazardous voltages may be present.
  • Page 62 A B switch · 3-3 Autodial · 3-8 blank screen · 3-6 DB-9 · 3-13 diagnostic · 3-5 Dial button · 3-6, 3-8 direct receive outputs · 3-17 Drop button · 3-6, 3-9 DTMF · 3-10 Edit knob · 3-6 front panel ·...
  • Page 63 SECTION 4 AUDIO OPERATIONS A console at your fingertips... The Send Mixer Microphone Inputs Mic Routing Switches Line Inputs Line Routing Switch Send Level Controls SEND Meters The Monitor Mixers Monitor Routing Switches About Monitor Panning Adjusting individual monitor panning Receive Meters LOCK lights Analog (G.711) phone calls...

  • Page 64: A Console At Your Fingertips

    A console at your fingertips... ZephyrExpress includes three separate 4-input stereo mixers, designed to make remote broadcasting easier. They incorporate both digital and analog technology, giving you the best of both worlds. We used sophisticated analog circuits for: ¥ Wide input range ¥...

  • Page 65: The Send Mixer

    The other monitor mixer has dual stereo headphone outputs to feed producer and talent simultaneously. If we sound proud of the design of ZephyrExpress’ mixers, we are. But if you’d prefer to bypass them entirely, there are also separate direct-codec outputs . You can use these for high-quality stereo monitoring regardless of the mixer settings.
  • Page 66 — Mic 2 test tone — Limiter bypass ZephyrExpress’ limiter engages at 15 dB above the normal operating value, so minor overloads aren’t affected. The limiting action itself gives you as much as another 20 dB of headroom. AUDIO OPERATIONS...

  • Page 67: Mic Routing Switches

    · Total harmonic distortion and noise figures are slightly better with the limiteroff. You might want to turn off ZephyrExpress’ limiter if another limiter is already being used in the circuit. HOT TIP! Some forms of non-linear processing, including clipping and multiband compression, will make any perceptual coder less efficient.

  • Page 68: Line Inputs

    Line Inputs The two line inputs can be used for a single stereo or one or two mono signals. Line A XLR/TRS – Line B XLR/TRS +4 / -10 select – +4 / -10 select Each input jack accommodates XLR or 1/4" phone plugs, wired balanced (pin 2 or tip hot) or unbalanced (signal on pin 2 or tip;...

  • Page 69: Send Level Controls

    Send Level Controls The three large black knobs control the level of their respective signals to the send bus. They are calibrated in arbitrary gray dots that don’t mean much, since the best way to mix is by using your ears and the SEND Meters The two 14-segment level meters have a fast attack and slow decay time, to alert you...

  • Page 70: Headphone Jack

    The Monitor Mixers Mon 2 Headphone Jack There are two independent monitor mixers. ¥ has a stereo headphone jack and two XLR output jacks on the rear panel. MONITOR 1 Its jacks are marked with gray circles, and its knobs have gray inserts. has stereo headphone jacks on the front and rear panel.

  • Page 71: About Monitor Panning

    About Monitor Panning Since ZephyrExpress’ mixers are digitally controlled, we were able to build in a lot of versatility. Each of the four possible sources (A and B send bus, A and B receive codec output) is connected to four separate pan controls for each monitor mixer.

  • Page 72: Adjusting Individual Monitor Panning

    Monitor 1 Receive From Rec A Monitor 1 Send From Send A From Rec B From Send B Adjusting individual monitor panning Scroll down the of the four monitor outputs: The four submenus have identical structures: Select which setting you want to adjust by highlighting it and pressing indicator ( ) will start flashing to indicate it’s active.

  • Page 73: Receive Meters

    RECEIVE meters (page 4-7). They report the digital signal exactly as received from the distant SEND studio: nothing happens in ZephyrExpress that can change the levels between the codec, these meters, and the RECEIVE OUT If the meter readings are too low or too high, ask the distant studio to change their send level.

  • Page 74: Analog (G.711) Phone Calls

    When a call is received, ZephyrExpress picks up on the first ring. The internal speaker chirps once, and the call timer for that line starts counting. If the The acronym stands for Plain Old Telephone Service.

  • Page 75: Placing Calls

    When the distant phone picks up, ZephyrExpress will chirp and you’ll be connected. The line’s call timer will start counting. Remember, they won’t hear you unless you’ve routed a mic to the send bus corresponding to that line and turned up the mic’s level.

  • Page 76: Dealing With Delay

    ISDN line using Layer 3mono. The other ISDN channel could be used for a POTS call from the studio, to let the studio producer talk directly to the remote engineer using ZephyrExpress’ second monitor circuit.
  • Page 77 Layer 3mono mode for high-quality audio but send the telephone caller’s audio on ZephyrExpress’ second line as a POTS signal. Other intermediate tradeoffs are possible and will be dependent on your format. You may also be able to significantly speed up the talent’s thinking time by judicious...
  • Page 78 analog circuits · 4-2 analog phone calls · 4-12 coding delay · 4-14 coding methods · 4-12 delay · 4-14 G.711 · 4-12 G.722 · 4-12 headphone jacks · 4-8 Layer 3 · 4-5, 4-11 limiter · 4-4, 4-5 line inputs · 4-2, 4-6 LOCK lights ·...
  • Page 79 CHOOSING THE CODING METHOD FOR YOUR APPLICATION Delay vs. Quality Dual vs Stereo vs Joint Stereo in Layer 3 Dual Site Operation Layer 2: Mono64kpbs vs MONO128; Dual vs JSTEREO Sampling Rate Compatibility Between Telos Codecs With Non-Telos Equipment 5-10 5-11 5-12 5-12 5-13...

  • Page 80: Overview

    OVERVIEW Introduction to Audio Coding Audio takes up a lot of data. Without data reduction, CD-quality quality audio — 16 bits at 44.1kHz sample rate — requires a transmission capacity of about 705 thousand bits per second (kbps) for each audio channel.

  • Page 81: Basic Principles Of Perceptual Coding

    finalized in November 1992 with three related algorithms, called Layers, defined to take advantage of psychoacoustic effects when coding audio. Layer 1 and 2 are intended for compression factors of about 4:1 and 6 or 8:1 respectively, and these algorithms have become popular in satellite and hard-disk systems.
  • Page 82 Masking effects in the frequency domain. A masking signal inhibits audibility of signals To benefit from the masking effects, perceptual coders use a filterbank to divide the input audio into multiple bands for analysis and processing. The maximum masked noise level is calculated depending upon the spectral content, and the available bits are allocated so as to keep the quantization noise below the masking threshold at every point in the spectrum.

  • Page 83: Iso/Mpeg Layer 3

    AES by Frank Foti on this topic. ISO/MPEG LAYER 3 MPEG Layer 3 is the most powerful coding method available in ZephyrExpress, and we particularly like it because it is perfectly matched to the bitrates available on ISDN BRI lines.

  • Page 84: Redundancy Reduction

    main bands into 18 more. At a 32 kHz sampling rate, the resulting bandwidth is 27.78 Hz – allowing very accurate calculation of the masking threshold values. Sufficient frequency resolution is available to exceed the width of the ear’s critical bands (100 Hz below 500 Hz;...

  • Page 85: Iso/Mpeg Layer 2

    ISDN or T1 circuits, and hard disk storage systems using Ethernet for signal distribution. We include it in ZephyrExpress to offer compatibility with the widest variety of codecs. Our implementation is the highest quality, using DSP code licensed directly from the algorithm’s primary inventor: the IRT in Munich.

  • Page 86: Layer 2 Joint Stereo

    Layer 2 Mono-128 ZephyrExpress lets you combine ISDN channels and use the resulting 112/128kbps data stream for a single Layer 2 monaural channel. Since a bigger data path is available, this mode uses the least compression and can give you the highest mono quality for particularly critical applications.

  • Page 87: Cascading

    2 - 5 passes of Layer 2 operating at high (112kbps+/channel mono; 192kbps+ Joint Stereo) bitrates with good results. • Informal tests at the Telos lab with two passes of ZephyrExpress Layer 3 have proven successful, with listeners noticing no audible degradation, even on “difficult” CDs. •...

  • Page 88: Mixed Mpeg Layer 2 And Layer 3 Signal Chains

    Use the maximum bitrate you can afford at each stage. Hard disk recorders and other studio systems often have an option to adjust this. For very critical work, remember that ZephyrExpress may be used in a mode where a mono program is split over two digital network channels.

  • Page 89: Choosing The Coding Method For Your Application

    CHOOSING THE CODING METHOD FOR YOUR APPLICATION This chart describes and compares some of the important characteristics of each method. Because ZephyrExpress includes all three popular coding methods, it’s possible to choose the most appropriate one for each application. Audio Coding Comparison Chart Algorithm Audio Freq.

  • Page 90: Delay Vs. Quality

    Layer 2 requires the next longest delay, and G.722 has minimal delay. ZephyrExpress permits the coding mode for the send and receive paths to be indepen- dently chosen, so the choice may be optimized for the specific requirements of each direction.

  • Page 91: Dual Site Operation

    IMPORTANT! The Layer 3 decoder in L3 STEREO connected and operating in order for the decoder to function. Until both lines are present, the decoder will not output anything, even if the transmission mode at the distant studio is not stereo. Any data drop outs would cause interruption in both audio channels.

  • Page 92: Sampling Rate

    • (Joint Stereo) mode uses the “intensity coding” method in order to provide L2 JOINT maximum quality for stereo program material. Delay is also compensated to preserve phase. Sampling Rate This option sets the sample rate for the transmitted and received coded audio. Input/output is independent and is set in the AES menus.

  • Page 93: Compatibility

    Compatibility Between Telos Codecs The table below shows which Zephyr or ZephyrExpress transmit and receive modes may operate with each other, the resulting audio bandwidth for each, and information which describes what happens to the audio channels when they are output from the decoder.
  • Page 94 Layer 3. Our implementation follows the strict ISO/MPEG standard. ZephyrExpress’ G.722 mode offers compatibility with almost all codecs which use this coding method, and which do not use the rare H.221 framing scheme.
  • Page 95 APT-X · 5-2 audio coding · 5-2 bandwidth · 5-14 bit reservoir · 5-6 cascading coders · 5-9 CCITT · 5-8 coding methods · 5-2 coding methods, comparing · 5-11 compatibility · 5-15 delay · 5-12 dual mono · 5-13 dynamic range ·...
  • Page 96 SECTION 6 MENU REFERENCE The Menu System A typical menu Navigation Shortcuts Getting HELP Menu Overview Using Setups Applying a Setup Creating or Changing a Setup Master Setups Applying a Master Setup Creating or Changing a Master Setup Auto-creating a new Master Setup Manually creating a Master Setup Updating an existing Master Setup Deleting a Master Setup...

  • Page 97: The Menu System

    Many menu items are “live” — changing the value makes an immedi- ate change in ZephyrExpress’ behavior — and every item is supported by specific, unique online HELP. To find out what a item menu does (without reading this section), high-...

  • Page 98: Navigation Shortcuts

    • If the item is all text or numbers (such as this operating parameter. Select it by pressing • If the item has an arrow icon (such as you press EDIT . Here you’ll find additional choices related to the item (in this case, you can set each microphone’s sensitivity, phantom power, and so on).

  • Page 99: Getting Help

    This is often the fastest way to escape from menus. Getting HELP ZephyrExpress’ context-sensitive HELP system is always aware of which menu item you’ve highlighted, and will report complete details on how that item works and its possible settings.

  • Page 100: Menu Overview

    Menu Overview Utility Menu Codec Transmit Receive Bitrate Sample Rate Compatibility Ancill Data Status Out Loop Mode Contacts Out Codec Setups System LCD Contrast LCD Backlight Click Volume POTS Volume Menu Timeout Baud Rate Set Time Software About... Safe Mode Codec Audio ISDN...

  • Page 101: Using Setups

    Custom setups are a great way to change all the items in a menu quickly as you use ZephyrExpress for different kinds of remotes. If you create a custom ISDN setup for each venue where ZephyrExpress is used, you won’t have to worry about SPIDs or other critical numbers being mis-entered in the field.

  • Page 102: Master Setups

    Select the field and choose from Action Then confirm. If you’re creating a new setup, you’ll then be able to enter a name using the keypad. After you confirm the name, the the current settings for this menu will be stored with that name. If you’re updating an existing setup, the Name field will display the existing setups for this menu.

  • Page 103: Creating Or Changing A Master Setup

    . Then confirm. View Delete Auto-creating a new Master Setup The easiest way to create a Master Setup is to let ZephyrExpress do it for you. If you confirmed Action: Auto create Setup. When you then select the menu. If a menu setup is currently active, it will note which one; if you’ve manually entered settings for that menu, it will create a new menu setup with the same name as the new Master Setup.

  • Page 104: Manually Creating A Master Setup

    Master setup. Follow the in- structions above to select an existing menu setup, a custom one, or none. You can’t update a Master Setup that was preset by Telos ( indicated with an asterisk in its name).

  • Page 105: Autodial Setups

    If you selected Delete you select one, the confirmation screen that appears. You can’t delete a factory-preset Autodial: these are Telos’ ISDN test lines, and we want them to be available for every user. 6-10 MENUS Create new Update , you’ll be able to enter a...

  • Page 106: Menu Details

    If the bitrate is manually changed while a call is in pro- gress, ZephyrExpress can’t auto-adapt and audio will be lost until it’s changed back.
  • Page 107 ISDN TIP! Some long-distance connections don’t support 64kbps. If ZephyrExpress won’t lock under these circumstances, both you and the distant site should change to 56kbps. — Sample Rate COMPATIBILITY TIP! If incoming audio sounds pitch-shifted, ZephyrExpress’ sample rate doesn’t agree with the distant studio’s. Change it to match... or enjoy the effect.

  • Page 108: Audio Menu

    — Used for testing (see Troubleshooting, section 9) Loop Mode (Normal operation is possible) (Incoming ISDN immediately routed back to ISDN line) Near IMPORTANT NOTE! Normal operation is impossible unless is displayed in the upper right of the Status Screen. [Loop Mode] The level meters are disabled in as a reminder.
  • Page 109 WARNING! If you apply phantom power to an unbalanced microphone, or to a mic with shorted wiring or cables, you may damage the microphone and ZephyrExpress. Don’t use phantom power unless you’re using a condenser microphone that you’re sure is wired for it.

  • Page 110: Isdn Menu

    Ntl.I-1 ETS300 ZephyrExpress will not be able to communicate with an ISDN line if this information is wrong. See section 7, ISDN, for complete details. Sets how the Send A bus signal is panned when Monitor 1’s Sets how the Send B bus signal is panned when Monitor 1’s...
  • Page 111 You can also use the ternative long distance carrier. But if you won’t be able to dial local numbers un- til you remove this prefix. 6-16 MENUS , ZephyrExpress tries to resynchronize Switch Type Service Profile Identification Number. Required only by Ntl.I-1. "...

  • Page 112: System Menu

    The timer starts again at the higher menu, and will keep reverting until it reaches the Status screen. You might need the alert because ZephyrExpress picks up on the first ring... so there won’t be a long ringing sound.
  • Page 113 System Level functions. See Setups, page 6-6 ZephyrExpress’ clock will keep track of the time and date in US or European styles, depending on how you enter it. To set the clock, se- lect this item and enter the current date and time according to the in- structions below.

  • Page 114: Safe Mode Menu

    When you select this item, you’ll see a screen like this: About... V1.2.1/2.36 the software was compiled. If your ZephyrExpress’ you have old software. If yours shows a significantly higher version number, this manual is probably out-of-date. In either case, contact Telos customer support.
  • Page 115 access code · 6-16 arrow icon · 6-3 autodial · 6-10 Dialog4 · 6-12 G.722 · 6-11 help button · 6-2 Help system · 6-4 keypad · 6-7 6-20 MENUS line inputs · 6-14 lock · 6-2 Loop Mode · 6-13 menu navigating ·...
  • Page 116 Directory Numbers (DNs) Long-Distance Digital Connectivity HOW TO ORDER ISDN Dealing with The Phone Company Details, Details ZephyrExpress ISDN Compatibility Protocols Ordering: Central Office Switches and Protocols National ISDN-1 (USA and Canada) AT&T Point-to-Point (Custom) (USA, Japan, Israel, some others) AT&T Point-to-Multipoint (Custom)

  • Page 117: Isdn Basics

    Digital telephone transmission services — originally intended just to make basic voice calls more cost-effective — have also made the high- quality transmissions of ZephyrExpress possible. The first significant users of digital audio techniques were the phone companies: In the mid 60’s a digital transmission method called “T-carrier”...

  • Page 118: The Basic Rate Interface (Bri)

    NT1 (or built-in NT1 in ZephyrExpress). While ordinary phone wires may work between an external NT1 and an S interface, 10Base-T Ethernet cables are better at rejecting noise. As a last resort, move ZephyrExpress closer to the telco interface and pipe the audio instead. The Basic Rate Interface (BRI) On one ISDN BRI circuit, there are three simultaneous channels: Two 64kbps “bearer”...

  • Page 119: Spids

    USA. This number is given to the user by the phone company and must be entered into ZephyrExpress for the connection to function. SPIDs usually consist of the phone number plus a few prefix or suffix digits... but they don’t have to. There is frequent con- fusion between telephone numbers and SPIDS, even among Telco personnel.
  • Page 120 means incorrect SPID2 Ready Wait This is what you want to see. ISDN is working. Ready Ready Realtors remind buyers that the three most important factors of real-estate success are Location, Location, and Location! We want to remind you that the three most important factors to ISDN success are: Get the SPIDs, Get the SPIDs,...

  • Page 121: Directory Numbers (Dns)

    SPID at all. WeÕre monitoring these developments carefully, and at some point may be able to support these features Ñ if they become available ÑÊin a ZephyrExpress software upgrade. Directory Numbers (DNs) Directory Numbers, or DNs for short, are the 7 digit telephone numbers assigned to the ISDN line (or what you’d typically find in a telephone directory).

  • Page 122: How To Order Isdn

    Some long-distance carriers — not the big three — can’t handle ISDN at all. For the lat- est information check the section in the Appendix “ISDN, BRI, ZephyrExpress, and You”. Some long-distance connections are limited to 56kbps/channel. This limitation is be- coming more rare.

  • Page 123: Details, Details

    ISDN line for ZephyrExpress. The easiest way to order the line is to use the Faxable form in the Appendix, ISDN BRI, ZephyrExpress, & You. There is also a list of contact telephone numbers for most of the regional telephone companies.

  • Page 124: Zephyrexpress Isdn Compatibility

    ZephyrExpress units shipped outside the USA and Canada have the S interface only. In North America, the NT1 is usually provided by the user: ZephyrExpress units sold within that area include an NT1 built into the terminal adapter.

  • Page 125: Ordering: Central Office Switches And Protocols

    ZephyrExpress, the differences need to be taken into account when lines are ordered and the equipment set up. In the USA, telephone companies use either AT&T 5ESS, Northern Telecom DMS100, or Siemens EWSD switches. Each of these can support the National ISDN 1 (NI-1) protocol standard, which has been specified by Bellcore, the technical lab jointly owned by the phone companies.

  • Page 126: At&T Point-To-Point (Custom) (Usa, Japan, Israel, Some Others)

    AT&T Point-to-Point (Custom) (USA, Japan, Israel, some others) Available on AT&T CO switches version 5E4.2 and above. This is the most basic possible configuration of ISDN, but supports all ZephyrExpress functions. It is the most conven- ient protocol for ZephyrExpress set-up because no SPIDs are required.

  • Page 127: At&T Point-To-Multipoint (Custom)

    ZEPHYREXPRESS SETTINGS (FOR YOU TO ENTER): Switch type : Not required SPIDs AT&T Point-to-Multipoint (Custom) Available on AT&T 5ESS CO switches version 5E6 and above. This is becoming essentially obsolete as NI-1 has the same capabilities. It is not supported by ZephyrExpress.

  • Page 128: Euro-Isdn (Europe, Hong Kong, Some Others)

    ISDN circuit. MSNs are a way of determining which numbers will be an- swered. If you enter MSNs in ZephyrExpress, it will answer only those two numbers. Other- wise, ZephyrExpress will answer calls on any of the circuitÕs directory numbers.
  • Page 129 1010-xxx · 7-7 alternative long distance · 7-7 bearer channel · 7-3 BRI · 7-3 CSD, CSV · 7-8 directory number · 7-11, 7-12 directory numbers · 7-6 DN · 7-6 Euro-ISDN · 7-10 Inact · 7-4 Init · 7-4 ISDN basics ·...
  • Page 130 SECTION 8 SYSTEM FUNCTIONS Software Updates ZephyrExpress data ports The Serial Port Communicating Security Levels Command Help Command Language Details The Parallel Port 8-12 SYSTEM FUNCTIONS...

  • Page 131: Introduction

    One other system function — setting the internal clock — is so simple that it’s covered in a few paragraphs as Actually, all of the system functions in ZephyrExpress are designed to be transparent to the user. Unless you want to learn all its inner details and capabilities and intend to make your ZephyrExpress sit up and do tricks, you can probably skip this section.

  • Page 132: Zephyrexpress Data Ports

    Any parameter that can be set using a menu can be queried and set via remote control, and you can remotely instruct ZephyrExpress to place a call on one or both ISDN lines. There is no provision for remotely controlling the front-panel routing switches or volume knobs.

  • Page 133: Communicating

    The V1.2.1/2.36, 16.07.1998 12:39:42 refers to the software version and when it was compiled, not the current date and time. DOCUMENTATION NOTE! In this manual, we’ll use Courier Regular to indicate text ZephyrExpress is sending to you. We’ll use Courier Bold to indicate text you type into your computer and send to ZephyrExpress.

  • Page 134: Security Levels

    (default is 9600 baud), or try different rates at your computer. • COM port selection at the computer. ZephyrExpress echoes any data sent to it, to verify proper operation: If a connection is properly made, anything you type will be returned to you. Try typing something: >>Hello,ÊZephyrExpress! You should see the letters on your computer’s screen as you type them.

  • Page 135: Command Help

    >> WARNING! If ZephyrExpress does not respond to user or expert when you try to log in, somebody changed your password. You can’t change it back without knowing the new one. Even a cold boot — which restores all other factory defaults —...

  • Page 136: Command Language Details

    Anything within brackets [ argument within brackets; if you send this command without an argument, it will report the present value. So if you just sent baud and Return, ZephyrExpress would send back the current communication rate. Anything between < > is a single argument. A bar | means or, as in “choose this argument or the other”.
  • Page 137 Example bye ¶ conn <1|2> Example conn 1 2417225 ¶ COMPATIBILITY NOTE You can command ZephyrExpress to place a high-quality ISDN audio call on either line, but you can’t use the remote control to place an analog POTS call. country none [<usa|germany>] Example country usa ¶...

  • Page 138: System Functions

    Display current security level. Unlock at the security level associated with this password. Opens communication at User level. Log out from ZephyrExpress control system. Resets front panel level meters to normal operation after a test. Turns on the four level meter LEDs up to 0...9...
  • Page 139 ZephyrExpress confirms the new password. . Check the response to make sure you typed the new Read current time from ZephyrExpress’ real-time clock. Time will be in the format: 30.03.1999 19:02:12, 15331 msec, 15.330856 sec, where the first string is the date, the second is the time of day, and the third and fourth indicate the total time since last startup.
  • Page 140 In addition, Expert level includes these commands: numbase <dec|hex|bin|none> DEEP TECH NOTE! Numbase is provided for users who want to write their own control software. It affects only the remote control function: the displays remain in decimal at all times. oscill <on|off>...

  • Page 141: The Parallel Port

    The Parallel Port ZephyrExpress’ parallel port has five contact-closure outputs and four logic or contact- closure inputs. Voltages and connection details are in Section 3, Hardware. FUNCTION Ground Output 2 Status Out Output 3 Input 3 Input 0/Panic Dial +5 volts 400 ma max.
  • Page 142 codec mode · 8-9 , 8-9 DB-15 · 8-12 DB-9 · 8-3 diagnostic · 8-5 G.722 · 8-9, 8-9 locked · 8-12 meters · 8-9 oscillator · 8-11 parallel port · 8-12 password · 8-6, 8-9 phantom power · 8-9 POTS ·...
  • Page 143 SECTION 9 TROUBLESHOOTING First Steps GENERAL Thinking About Problem Solving Diagnostic Aids Look into the Lights LOOPBACK modes Some Error Conditions No functionality; the box is totally or partly dead. Condition: ISDN Connecting OK, But No Audio Condition: No Audio In Both Directions Condition: Audio In One Direction Only Condition: Audio Distorted Condition: Major Echo Action...

  • Page 144: First Steps

    Unless you see blue smoke pouring out of the unit, these pages are probably all you’ll need to get running again. And if they aren’t — or if you do see blue smoke — you can always contact Telos Customer Service at •...

  • Page 145: General

    Are you sure you’re plugged into the right port? For most US installations, the line should be plugged into the lower, 4- conductor jack on the back of ZephyrExpress — even if the phone company supplied an 8-conductor RJ-45 jack with the line. Use a standard telephone line cord: when you plug it into the RJ-45, it’ll automatically center itself and locate...
  • Page 146 • Step 5. Generate an experiment to test the hypothesis. Plug this ZephyrExpress into a known good line; call a known good Zephyr or ZephyrExpress at the other end; if long-distance doesn’t work, try a local call. NOTE: You should plan your tests to eliminate 50% of the possible problems in one test, if possible.

  • Page 147: Diagnostic Aids

    Look into the Lights You can learn a lot about an error condition by observing ZephyrExpress’ panel lights: Front-panel LEDs All of ZephyrExpress’ LEDs should light for a few seconds on power-up or reboot. The routing switches’ MIC1 MIC2 green, the meters are fully on, and the Christmas Tree.

  • Page 148: Loopback Modes

    LOOPBACK modes You can check ZephyrExpress’ audio circuits by looping the send bus directly into the re- ceive bus, check its coding operation by looping the transmit encoder directly into its re- ceive encoder, or check the entire unit by dialing into another Zephyr or ZephyrExpress that’s set to loop an incoming signal directly back.
  • Page 149 If these tests fail, and you’re sure the ther with the mic and headset and their wiring or with ZephyrExpress’ internal audio circuits. You may be able to broadcast using the alternate mic input or the line input, until you can get it fixed.
  • Page 150 Codec: Loopback usual manner, sent into the ISDN interface but then looped directly back to the decoder. This checks over 90% of ZephyrExpress’ functionality with no ISDN line present. IMPORTANT NOTE! If you are using the European ISDN TA and aren’t connected to an active ISDN line, you will hear dropouts in the audio signal during Near Loopback.
  • Page 151 . Then have the distant studio set their Loopback mode to Far. Set your mode ZephyrExpress so that both the transmit and receive methods match, and call the distant studio. Their Far Loopback should route your signal directly back to you.

  • Page 152: Some Error Conditions

    Does the outlet have power? Is the power module’s fuse blown? The green LED on the power module should be lit. If it is, then the LCD display on ZephyrExpress should be . You can test the power supply for the voltages as listed in section 3, Hardware. Since switching supplies must be tested under load, you’ll have to dismantle the its XLR con-...

  • Page 153: Condition: Isdn Connecting Ok, But No Audio

    Set Codec: Transmit should work in both directions. This confirms that ZephyrExpress is OK, and that the problem lies somewhere downstream: either the distant codec is having trouble, or the telco’s switching equipment or long distance carrier is having problems.

  • Page 154: Condition: No Audio In Both Directions

    Do the loopback tests described earlier. Make sure the Try different microphones and cables. HOT TIP! Use ZephyrExpress’ POTS facility to place an analog call over the ISDN line to a standard phone at the distant studio, so you can compare notes on the codecs’ settings.

  • Page 155: Condition: Major Echo Action

    Condition: Major Echo Action If you can’t receive distant audio, but get a delayed version of your own transmitted sig- nal, it’s probable that either your ZephyrExpress or the distant unit is in Loopback mode. Use the Codec: Loopback equivalent step on their unit.
  • Page 156 (you did use that information, didn’t you?) The PTP protocol does not require SPIDs, so ZephyrExpress does not send or check them but assumes the line is okay. Meanwhile, the telco is still waiting for those darn SPIDs.
  • Page 157 2 B-channel AT&T “Custom Point to Multipoint” line with 2 phone numbers and 2 SPIDS. ZephyrExpress does not support this con- figuration. If you have Custom Point to Multipoint, you can often get things working temporarily by following these steps: 1.
  • Page 158 They’ll probably need to have someone call you back. Verify this person is logged into the switch. Get their fax number and fax them ZephyrExpress’ ISDN infor- mation from the Appendix of this manual. Sometimes the information in the Business Office computer is wrong. By verifying what is programmed into the switch itself you can save time.
  • Page 159 LED is on the rear panel, near the U jack of North American LINE DIRECT ZephyrExpress units. If there’s no ISDN line connected, or the line is dead, the light will blink rapidly (about 5 Hz). If NT1 can contact the central office, the light will blink slowly (about 1 Hz).

  • Page 160: Intermittent Isdn Problems

    The most important tool is ZephyrExpress’ integrated ISDN analyzer. This lets you look at the transactions between the Telco line and ZephyrExpress, to help you figure out where the problem lies. The usual cause is a Telco problem, like mis-programming or an intermittent connec- tion.
  • Page 161 Note that in some cases there may be more than one meaning. This can frequently be evaluated by whether the message has been received by the calling party or the called party. Cause No. 1 - Check number, redial This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated(assigned).
  • Page 162 called user or by the network. In the case of user determined user busy it is noted that the user equipment is compatible with the call. Cause No. 18 - No far end response This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within a prescribed period of time.
  • Page 163 Cause No. 30 - Result of a STATus ENQuiry/Special Intercept announcment:# unassigned This cause is included in the STATus message the user sends to the switch when the rea- son for generating this message was a prior receipt of a STATus ENQuiry message This value indicates that a user from outside a special business group (i.e.
  • Page 164 Cause No. 47 - Resource unavailable This cause is used to report a resource unavailable event only when no other cause in the resource unavailable class applies. Cause No. 50 - Requested facility not subscribed This cause is used to report that the cannot use this feature because s/he has not sub- scribed to it.
  • Page 165 Cause No. 97 - Message type nonexistent or not implemented This cause indicates the equipment sending this cause received a message with a mes- sage type it does not recognize because the message is undefined, or it is defined but not implemented by the equipment sending this cause.
  • Page 166 audio problems · 9-11 Customer Service · 9-2 diagnostic · 9-20 directory number · 9-15 error message · 9-13 Inact · 9-13 Init · 9-13, 9-14 ISDN “Cause” · 9-17 ISDN analyzer · 9-18 ISDN continuity · 9-3 ISDN problem · 9-13 Layer 3 ·...
  • Page 167 SECTION 10 SCHEMATICS and DATA SHEETS DATA SHEETS 10-1 SCHEMATICS...
  • Page 168 SECTION 11 APPENDIX ABOUT AUDIO LEVELS “Nominal” Levels Level, Gain, dBu and dBm CODEC COMPATIBILITY INFORMATION Comprehensive ZephyrExpress Compatibility List FINDING PUBLIC ISDN SITES List of Known Working SPIDs by Telephone Company Ameritech Bell Atlantic Bell South Cincinatti Bell Fort Mills Telephone...

  • Page 169: About Audio Levels

    VU meter calibrated so that a test tone set to the 0 dB red-green junction outputs +4 dBu to ZephyrExpress. The mixer is adjusted so that the VU meter looks “normal” on a music or voice program. A nominal +4 dBu is being sent to ZephyrExpress.

  • Page 170: Codec Compatibility Information

    We are constantly testing compatibility in our own labs, as well as accumulating infor- mation from others regarding using ZephyrExpress with other codecs. For the latest compatibility information please check our web site, http://www.Zephyr.com, or con- tact Telos customer support.
  • Page 171 • ZephyrExpress supports “CCS CDQ protocol compatible” channel splitting for ISO/MPEG Layer II stereo and mono 128 modes. • ZephyrExpress G/722 uses statistical sync. G.722 sample rate is fixed at 16 kHz regardless of menu setting. CCS NOTES: • CDQ 1000: Switch off H.221 (DIP switch 7 , on back, in down position; to “AUTO” mode) on CDQ to transmit from CDQ to ZephyrExpress.

  • Page 172: Comprehensive Zephyrexpress Compatibility List

    G.722 DIALOG4 NOTE: • ZephyrExpress can transmit to DIALOG4 in the modes indicated. For DIALOG4 to transmit to ZephyrExpress, compatibility mode must be set correctly. MUSICTAXI must have “Configuration/ISDN accept mode” set to ALL, and “Configuration/ISDN mode” set to RI, DNRI, or DNR depending on firmware version.
  • Page 173 G.722 : yes! • Comrex Layer-II DX-200 L3-Mono L3-Stereo L2-Mono@48 : yes! L2-Stereo : yes! Must be switched to “Telos /CCS compatibil- ity” mode for stereo. L2-M128 : yes! G.722 : Yes • Comrex G.722 DXP and DXR G.722 : yes! Standard G.722...

  • Page 174: Finding Public Isdn Sites

    L3-Mono FINDING PUBLIC ISDN SITES When you need to find a ZephyrExpress, Zephyr, or compatible codec to connect with in another city, there are a number of resources to which you can turn. There are many hundreds of sites around the country – and the world – which offer a wide variety of services.
  • Page 175 WWW: http://www.dplay.com • Paper: Telos usually has printouts of the current list. Comrex keeps the list in a fax-on- demand system, for use by their customers. • Digifon List Dave Immer’s Digifon publishes a list of codec users around the world, heavily geared toward recording studios.

  • Page 176: List Of Known Working Spids By Telephone Company

    A standardized SPID format for national ISDN of XXXYYYZZZZ0101 has been phased in and is worth trying. Incorrect SPIDS will be indicated by a line status of “Wait, Init” on ZephyrExpress. Often the Telco will leave the last “00” or “01” off the end of your SPID when giving it to you.

  • Page 177: Gte

    ISDN ordering process can be simple and straightforward. This guide takes you through the process step-by-step. Telos Customer Support is available by phone or fax to answer any further questions you may have.

  • Page 178: Ordering Isdn

    “lines” to users also. We refer to a B chan- nel as a “line” on ZephyrExpress menus. ZephyrExpress’ internal interface (sometimes called by its generic name “Terminal Adapter”) is used to connect to digital ISDN telephone lines. It easily adapts to the various types of service offered by the range of Central Office (CO) switches installed by tele- phone companies in the USA and Canada.

  • Page 179: Details, Details

    DMS100, or Siemens EWSD switching equipment. While each will work with ZephyrExpress, there are some differences which need to be taken into account when lines are ordered and used. Each has a “protocol” – the language the user equipment and the telephone network use to converse (on the D channel) for setting up calls and the like.

  • Page 180: Spids

    This number is given to the user by the phone company and must be entered cor- rectly into ZephyrExpress in order for the connection to function. SPIDs usually consist of the phone number plus a few prefix or suffix digits. There is frequent confusion be- tween phone numbers and SPIDs, even among telco personnel.

  • Page 181: Nt1S

    In Europe and Asia the NT1 is always provided by the phone company, and only the S interface may be on user equipment. ZephyrExpress units shipped outside of the USA and Canada have the “S” interface only. In the USA and Canada the NT1 is provided by the user and is therefore built-in to the ISDN terminal adapter.

  • Page 182: The Faxable Isdn Order Form (For Use In Us Only)

    The majority of installations, if ordered in writing, with this information, go smoothly. If you do experience problems Telos Systems customer support is available to assist you. You may wish to also consult manual section 10 (Advanced Problem Solving) for addi- tional troubleshooting information.
  • Page 183 Date needed: Termination Date (if known: We request an ISDN Basic Rate Interface (BRI) line for use with a ZephyrExpress hi-fidelity audio codec. This device is used to transmit audio using digital telephone services. It requires Circuit Switched Data (CSD).
  • Page 184 Fax page 2 of 3 PROTOCOL: National ISDN-1 From AT&T 5Ess, Northern Telecom DMS100, and Siemens EWSD. If you use IOC Capability Packages, please use Capability Package “S” CO Values: Line Type: National ISDN-1 Bearer Service: CSD/CSV on both channels TEI: One dynamic per number 10XXX Long Distance Prefix: Yes Turn off features such as: packet mode data, multiline hunt, multiple call appearances, Electronic Key Tele-...
  • Page 185 (modem pools), message waiting, hunting, interLata competition, etc. Give us: 1) One Directory Number PROTOCOL: AT&T Point-to-Multipoint (Custom) Not supported by ZephyrExpress Please provide National ISDN 1 or AT&T Point-to-Point (Custom) PROTOCOL: Northern Telecom DMS100 ‘Functional’ (Custom, PVC1) Northern Telecom DMS100 switches BCS 31 and above...
  • Page 186 analog levels · 11-2 Audiobahn · 11-8 compatibility · 11-3 CSD/CSV · 11-13 Digifon · 11-8 EdNet · 11-8 IOC · 11-12 ISDN finding sites · 11-7 ISDN order form · 11-16 ISDN ordering · 11-10 line input/output · 11-2 Long Distance ·...

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