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Telos ZephyrExpress user manual Near Loopback for codec testing

Models: ZephyrExpress

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Near Loopback for codec testing

When the Codec: Loopback menu item is set to Near, incoming audio gets coded in the 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.

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IMPORTANT NOTE!

If you are using the European ISDN TA and arenÕt connected to an active ISDN line, you will hear dropouts in the audio signal during Near Loopback. This is not a problem with the equipment.

COMPATIBILITY NOTE!

Near Loopback requires both the transmit and receive coding methods to be compatible.

CURIOSITY NOTE!

Near Loopback is great for trying ZephyrExpressÕ audio coding algorithms with- out an ISDN line, and getting used to what the different settings sound like. ItÕs also great for impressing people with the quality that ISDN can yield over a good system.

9-8 TROUBLESHOOTING

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Telos ZephyrExpress user manual Near Loopback for codec testing

Contents

UserÕs Manual Manual Version 1.0 / AprilWhat youÕve got here Customer Service FeedbackBlank Screen? Test LinesZephyrExpress will dial a test line for you Warranty UpdatesPower Supply TrademarksRepairs Table of Contents Isdn Reference TroubleshootingSchematics and Data Sheets Appendix System FunctionsIntroduction H i c t Block Diagram Menu Structure Utility MenuQuick Results Tune into one of our test linesPart Quick ResultsGather information about your Isdn line Isdn type, check one Isdn telephone numbers with area codeMSN numbers, i f supplied Euro ETS300 only Set up the hardware Quick Results HConfigure ZephyrExpress for your Isdn line Quick Results Call yourself testing your unit and the line Configure the CodecHOT TIP Set up an audio input and output Place the call to yourselfQuick Results Tune into one of our test lines Isdn TIP What do I do if IÕm totally lost? Fast Answers to Frequently-Asked QuestionsHe Basics Knob either direction to change the LCD ContrastHow do I use the menus? Scrollbar HighlightedHow do I enter numbers or names? How do I use a menu that appears locked?How do I lock a specific menu? RightH6 How do I create my own Setups and Master Setups? HOT TIP How do I manually enter a network setup? How do I test that IÕve set things up properly?Alternate test procedure What do I do if I canÕt connect?Audio setup How do I set ZephyrExpress for my microphones? How do I use line-level sources?How do I test my audio and compression setups? How do I create a monitor mix?Isdn Connection How do I place a call? What do I do if they canÕt hear me? HHOT TIPHow do I send a test tone? How do I hang up?Where do I find answers to other questions? Circuit information · 1-4 coding methods · Quick Results Zephyrexpress Hardware About our hardware Front PanelMixer Section Send MixerMonitor Mixers Level ControlsDisplay section Send and Receive MetersLock LEDs LCD Display Control section Edit knobDial button Drop button Rear Panel Mode switches Data connection sectionIsdn Connections Interface Pinouts Remote Control jacks Line C Top pinInputs RS-232 PinoutsParallel Port Output 12 N/C Input 15 N/CAbout the XLR Connectors Audio i/o sectionOutputs ZephyrExpress All XLR PinoutsMicrophone Inputs Ground Audio +Monitor 1 XLR outputs Line InputsConductor Input plug Direct Isdn Receive outputsMonitor 1, Monitor 2 Headphone outputs Power connectionPower Supply Jack Headphone JacksPower Input Power Supply XLR Output+5Vdc @ 5A +12Vdc @ 1.5A 12Vdc @ .5A System Ground Zephyrexpress Hardware Zephyrexpress Hardware Audio Operations Console at your fingertips Mix flexibilitySend Mixer RoutingBeware the Phantom Mic Routing Switches Compression, will make any perceptual coder less efficientRouting, convert the mic inputs to line-level Line Routing SwitchGain Bold Face Front Panel HardwareSend Level Controls Send MetersReceive Meters Monitor Routing SwitchesMonitor Mixers SendAbout Monitor Panning Adjusting individual monitor panning Monitor 1 SendReceive Meters Lock lightsReceiving calls Analog call signal routingAnalog G.711 phone calls Talkback and cues can cut the cost of remote broadcastsPlacing calls Hanging upDealing with Delay Mix-MinusPhones and Remotes Remote Site Audio Operations Layer 3 Features CompatibilityOverview Introduction to Audio CodingBasic Principles of Perceptual Coding Coding Layer 3 Features Psychoacoustic MaskingAncillary Data Redundancy ReductionBit Reservoir Buffering BandsLayer 3 Joint Stereo 722 Layer 2 Joint StereoLayer 2 Mono-128 Cascading Mixed Mpeg Layer 2 And Layer 3 Signal Chains Audio Freq. Response/stereo Audio Coding Comparison ChartAlgorithm Audio Freq. Response/mono Layer 722With one transmission path Delay vs. QualityDual vs Stereo vs Joint Stereo in Layer With two transmission pathsWith one transmission path Dual Site OperationLayer 2 Mono64kpbs vs MONO128 Dual vs Jstereo With two transmission pathsSampling Rate Compatibility Between Telos CodecsWith Non-Telos Equipment Coding Coding Autodial Setups Codec menu Audio menu Isdn menu System menu Safe mode menuMenu Overview Menu System Typical menuNavigation Shortcuts Getting Help Weõre not Fortune TellersMenu Overview Utility MenuUsing Setups Applying a SetupCreating or Changing a Setup Master Setups Applying a Master SetupCreating or Changing a Master Setup Auto-creating a new Master SetupManually creating a Master Setup Updating an existing Master SetupDeleting a Master Setup Autodial Setups Creating a new AutodialEditing or deleting an Autodial Menu Details Codec menuIsdn TIP Audio menu See , Audio 75 dB @ 100 Hz -10 dB @ 40 Hz Isdn menu Directory Number 7 digits System menu Seconds Minute Minutes Minutes Never Safe mode menu Menus Ordering Central Office Switches and Protocols Background Basic Rate Interface BRIZephyrExpress Isdn Compatibility Isdn Basics BackgroundBasic Rate Interface BRI Isdn TIPSpids Get the SPIDs Get the SPIDsDirectory Numbers DNs Long-Distance Digital ConnectivitySwitch carriers Dealing with The Phone CompanyDetails, Details CSD and CSVNT1s ZephyrExpress Isdn CompatibilityProtocols Terminals and Terminal TypesOrdering Central Office Switches and Protocols1 National ISDN-1 USA and CanadaZephyrexpress Settings for YOU to Enter AT&T Point-to-Point Custom USA, Japan, Israel, some othersZephyr Settings for YOU to Enter AT&T Point-to-Multipoint CustomEuro-ISDN Europe, Hong Kong, some others Isdn System Functions Software Updates IntroductionZephyrExpress data ports Serial PortCommunicating Pin GroundPin Security Levels Hello, ZephyrExpressCommand Help Login user ¶Command Language Details Compatibility Note Display current encoder input & decoder Kept Times # for decimal numbersParallel Port Ground, the call is droppedSystem Functions Troubleshooting First Steps Thinking About Problem Solving GeneralTroubleshooting Look into the Lights Diagnostic AidsOther Ideas Front-panel LEDsLoopback modes TheyÕre disconnected during Far Loopback modeFar Loopback for local audio testing NT1 status LEDBlock diagram of the audio circuitry during Far Loopback Near Loopback for codec testing Operation Far Loopback from the distant studioLoopback Summary Some Error Conditions No functionality the box is totally or partly deadCondition Isdn Connecting OK, But No Audio Site B, but works perfectly when site B calls site aCondition No Audio In Both Directions Condition Audio In One Direction OnlyCondition Audio Distorted Condition Major Echo Action Isdn ProblemsError Messages Condition CanÕt Get Isdn Ready Ready IndicationReady when the switch type is set to PTP, and you cannot Dial, itÕs likely that your line is really National ISDN-11Really Important Isdn TIP Can you place a pots call? What does the Isdn Cause phrase say? Intermittent Isdn Problems Isdn Cause Phrases/ValuesCause No No route to network Cause No No route to destination. Prefix 1 dialed in errorCause No Check number, redial Cause No No prefixCause No Call rejected Cause No No far end responseCause No No answer Cause No Number changedCause No No circuit available Cause No Net problem, redialCause No Access information discarded Cause No Net out of orderCause No Requested facility not subscribed Cause No Service operation violatedCause No Resource unavailable Cause No Incompatible bearcapCause No Protocol Error, Unspecified Cause No Invalid information element contentsCause No Timeout disconnect Cause No Message type nonexistent or not implementedTroubleshooting Schematics Appendix ÒNominalÓ Levels Level, Gain, dBu and dBmCodec Compatibility Information CCS Comrex Intraplex YouCom Comprehensive ZephyrExpress Compatibility ListDialog CCS CDQ1000CCS Prima CCS CDQ2000CCS CDQ2001 Comrex Layer-II DX-200Philips MPR LIIBlue PKI G.722 phonePKI Magic Philips MPR Baby BlueDigifon List Telos World Wide Web site AudiobahnWWW Paper WWW Phone EdNetList of Known Working SPIDs by Telephone Company Pacific Bell Northern Pittsburgh Tele- phoneNynex Southwestern BellOrdering Isdn Company Telephone Number Worldwide WEBIOC Capability Packages ProtocolsSPIDs CSD and CSV56/64kbps NT1s Terminals and Terminal TypesLong Distance Carriers Faxable Isdn Order Form for use in US only Faxable Isdn BRI Line Order Form Page 1 From Location for lineProtocol National ISDN-1 Protocol AT&T Point-to-Point CustomCO Values Give us Protocol AT&T Point-to-Multipoint CustomProtocol Northern Telecom DMS100 ÔFunctionalÕ Custom, PVC1 Not supported by ZephyrExpressAppendix