Bilateral Loopback Test | Northern UTA220/UTA220k manual

Diagnostics

Bilateral Loopback Test

Bilateral loopback combines the functions of local loopback and digital loopback. Its loops data from the local terminal back to the terminal, so that whatever the terminal sends is echoed back (Figure 14-5). Also, it loops to where the ISDN B-Channel data normally sent to the local DTE. Any B-Channel data received by the UTA220 is processed by the rate-adaptation protocol, and then echoed back out the B-channel to the sending unit. This test is useful in diagnosing the DTE, UTA220, switch, ISDN line, and remote unit. Run this test if you are encountering data errors after a call is placed successfully.

Figure 14-5. Bilateral Loopback Test

UTA220/UTA220k

14-5

Image 125

Northern UTA220/UTA220k manual Bilateral Loopback Test

Contents

UTA220/UTA220k Terminal Adapter User Guide Copyright Industry Canada IC Requirements Shielded Cables Canadian Emission Requirements Load Number Preface and Statement of Application Preface Contents 25 bis Dialer Operation LCD Operation Contents Reset Maintenance DiagnosticsAppendix A. Specifications Softload DTE Interface PIN Descriptions Return Procedures Index To Access Schedule ServiceIssues For Questions Documentation Customer Response Card Business Reply Mail Other Features FeaturesChapter Introduction Compatibility Physical Description Operation Rear Panel EIA-232 Configuration Functional LED Description Site Preparation Chapter InstallationReceipt Inspection Isdn Connection InstallationPower Connection DTE Connection DTE Interface Specifications Installation UTA220/UTA220k Cover Removal Switches and StrapsChapter Getting Started Signal Ground Switch and Strap Settings OFF 35/EIA-232 Interface V.35 EIA-232 interface Card Interface Card Removal V.35 Switch Location DIP Switch Options Setup Central Office Switch Step LCD Screen Action Display Channel Prov CHANGE? P3 Data TEI = DIS Getting Started UTA220/UTA220k Isdn Basics ChapterIsdn Standards National Isdn Isdn Basic Rate Interface Points Basic Rate InterfaceTerminal Adapters Isdn Switches Isdn Service NI1 Switch Version Default Mode Custom Mode Isdn Addresses and Identifiers Switch Version Default Mode Other ModesTA Switch TA Switch Version Type Isdn Channels Channel Data Service Layer One Channel Signaling ProtocolsChannel Data Protocols Layer Three Layer Two LCD Operation Chapter LCD OperationLCD Menus Menu Option Summary Navigation button directions Port Config R R E N T OPTIONS? Cont T R DEL OP T I on S ? O T OC O L OPTIONS? Menu Option Summary Loading Port TEST? Current Port OPTIONS? View Chapter Bis Dialer Operation Operation in V.25 bis ModeSelecting V.25bis Bis Message Frames DCD Pin Operation DTE Interface PinsDTR Pin Operation Commands Command ProceduresDial Command CRN CTS Pin Operation Call Connect Indication CNX Connect Incoming Calls CICIndication Messages Response Messages Incoming Call Indication INC Bis Dialer Operation UTA220/UTA220k Pin Function ConfigurationChapter EIA-366 Dialer Operation Interface Signal Definitions Present Next Digit PND Digit Present DPR Example Dial Sequence Abandon Call and Retry ACR AT Command Statement Chapter AT Command OperationAT Command Mode Escape Sequence + + + Command Statement Guidelines Creating a Command Statement ATCommand Statement Buffer Monitor Display Numbered Commands Repeating a Command aGroup Commands Backspace KEY Supervisor Command Mode Command Scope Link Chapter Rate AdaptionRate Adaption Link Options Flow Control and Pin Options Options 120 Rate Adaption UTA220/UTA220k Option Select Bonding on the UTA220 Placing a Bonding Call Disconnecting a Bonding Call Synchronous Mode 2 Dial Stored Number Mode Synchronous Mode 1 Sync Pause ModeChapter Synchronous Operation Synchronous Modes 11-2 PAD Chapter ChannelFunctional Description AT@P1=P or AT@P1=D Command Atdd CommandEstablishing AN X.25 Session Initialize the PAD Establishing an X.25 Virtual Connection Disconnecting the X.25 Virtual Connection Escaping to PAD Command ModeEscaping to AT Command Mode PAD Command SET Common Apparent Problems Reset Issuing PAD CommandsStatus Stat Clear CLR SET Interrupt INT Remote Read RPAR? Read PAR?Set and Read SET? Profile Read/Save Prof Remote Set and Read RSET? PAD Select Reverse Charging R FacilitiesNetwork User Identification NUI Closed User Group CUG Flow Control Parameter Negotiation Recognized Private Operating Agency Command Description Response 1PAD Command Set Summary 2PAD Service Signals Command Extension Reason PAD Service Signals Pad Clear Service Signals PAD Reset Service SignalsSignal CLR INV Parameters and Values Saving the X.3 Parameter ConfigurationCLR NP CLR RNA DTE 5Default X.3 ParametersParameter Description Default Remarks 6CCITT X.3 Parameter Profiles Description Transparent Simple Value Description Parameter 1 Pad Recall Character6CCITT X.3 Parameter Profiles Parameter 3 Selection of Data Forwarding Characters Parameter 2 Echo Value Parameter 4 Selection of Idle Timer Delay Parameter 5 Ancillary Device Control Parameter 6 Control of PAD Service Signals Parameter 7 Action of PAD on Break from DTE Signal allows the DTE to signal the PAD without loss Parameter 9 Padding after Carriage Return Parameter 8 Discard Output Parameter 11 Binary Speed of Local DTE Parameter 10 Line Folding Parameter 13 Line Feed Insertion after Carriage Return Parameter 12 Flow Control of PAD by Local DTE Parameter 14 Padding after Line Feed Parameter 16 Character Delete Parameter 15 Editing Parameter 17 Line Delete Parameter 18 Line Display XXX CR LF Parameter 19 Editing PAD Service Signals Parameter 21 Parity Treatment Parameter 20 Echo Mask Parameter 22 Page Wait 28 Page Wait TA Software Architecture Chapter SoftloadSoftware Sets Software Format LCD Message Description TA Power-Up Sequence1PROM Error Messages Softload Operation Set/Display Softload Password %P1 Product Number Active Software 1D Alternate Software 1B Request Softload Product Version Information $Q Initiate Software Download $Y=x Copy Active Flash $Y2=x 5General Softload Error CodesS59 Softload Code Hex Description 7AH 6CPU Softload Error Codes6AH Typical Local Softload Session Swap to Alternate Software $T=x Error 13-10 Communication Diagnostics Chapter DiagnosticsGlobal Tests 2B+D Loopback Local Loopback Test Port TestsLocal Terminal Loopback Local Loopback Test Digital Loopback Test Digital Loopback Test Bilateral Loopback Test Bilateral Loopback Test View Diagnostic Code Diagnostic Status DisplayFront Panel Keypad Test View Product Information Fuse Chapter MaintenanceMaintenance 15-2 Appendix a Specifications Dimensions Supplementary ServicesPower Requirements Power Consumption Null Appendix B Factory Default Settings Enbloc Factory Default Settings Factory Default Settings UTA220/UTA220k Appendix C AT Command SetDescription Value AT&T 5ESS DMS100 PVC IC-1 DMS100 PVC IC-0 AT Command Set XON/XOFF DTRRTS/CTS CTS always on when On-line Data Set Ready DSR DSR always on Off default One default RTS Sync PVC Non-PVCdefault Call Rpoa NAK DLEESC,BEL,ENQ,ACK Default 1,1,0 ENQ Default 2,1,1 L22= Wait Range Isdn Interface Appendix D InterfacesInterfaces Table D-1U Interface RJ45 Pin Functions Table D-2EIA-232/C/V.24 Pin Functions EIA-232C Function Pin Table D-3V.35 Pin Functions DB-25 34 Pin Function Table D-4Ports 3 and 4 Pin Functions RL/CG EIA-366A RequirementsDLO CH/CI DTE Interface PIN Descriptions Data Terminal Ready Ring IndicatorReceive Clock Interfaces UTA220/UTA220k Appendix E Network Option Values Parameter Factory Default Range Value Port 3 Data TEI Appendix F Ascii and Ebcdic Characters SMM Ascii and Ebcdic Characters ACK0 Ascii and Ebcdic Characters Ascii and Ebcdic Characters Ascii and Ebcdic Characters 253 254 255 Trailing pad Appendix G Abbreviations and Acronyms CBX DAA Ebcdic Hdlc LSD Pots RMT LB Telset Abbreviations and Acronyms UTA220/UTA220k Appendix H Status and Connection Messages Status and Connection Messages UTA220/UTA220k Configuring D- and B-Channels Appendix I 128K Clear Channel Leased-Line Service AT&M2 Configuring the Port and Protocol Return Procedures Introduction Factory Repair Index DTE Page Warranty UTA220/UTA220k