Paradyne 7924 manual Testing, Detecting a Problem, Understanding Loopback Tests

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Testing

7

Detecting a Problem

The unit can detect and report problem conditions and perform diagnostic tests. The unit offers a number of indicators to alert you to possible problems, as described in Chapter 6, Monitoring the Unit:

HFront Panel LEDs

HBoard status and performance statistics

HRemote unit board status and performance statistics

Understanding Loopback Tests

Loopback is a diagnostic function that enables a technician to isolate equipment on the HDSL circuit to determine where on the circuit trouble may be occurring. Loopback takes the system off-line. Data received from the DTE (T1 or V.35 application equipment) is looped back, as depicted in Figures 7-1 through 7-4.

ªLocalº and ªremoteº refer to the point at which the data is looped back. In a local loopback the data is reflected back by the local unit (the unit that initiated the loopback). In a remote loopback, the data is passed on to the remote (far-end) unit and then reflected back.

Loopback tests are initiated through the terminal interface from either the CO or

CP side of the HDSL connection.

7924-A2-GB20-30

October 1997

7-1

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Contents Model 7924 Standalone T1 Hdsl Termination Unit Copyright 1997 Paradyne Corporation All rights reserved Warranty, Sales, and Service InformationTrademarks Important Safety Instructions EMI Warnings Contents Customizing V.35-Compatible Units Iii Cable Pin AssignmentsDocument Purpose and Intended Audience About This GuideDocument Summary Document Number Document Title Product-Related DocumentsHotWire 7924-A1 Models and Features About HotWire Model Termination UnitsModel Number Features Campus Network Applications Typical ConfigurationsDCS User Interface Types Cellular Network AccessPackage Checklist for HotWire Model 7924-A1 Installing the UnitOverview Connecting Power to the Unit Connecting to the NetworkProcedure DSX-1-Compatible HotWire 7924 ± Rear PanelChoosing an Interface Mode Using Terminal and Switchpack ModesConnecting to a System Terminal Switching Between Terminal and Switchpack Modes Customizing DSX-1-Compatible Units Accessing Configuration OptionsMaking Changes from the Terminal Interface Hdsl Card Type DSX-1-Compatible Units Configuration Options 1DSX-1-Compatible Units Configuration Options 2 Displaying Switchpack Definitions Making Changes in Switchpack ModeDisplaying Line Build-Out Definitions Switchpack Settings for Line Build OUTCustomizing V.35-Compatible Units Customizing V.35-Compatible Units ± 6 x 64 384 kbps ± No change to rate V.35-Compatible Units Configuration OptionsMaking Changes in Switchpack Mode CO/CP OFF=CP, ON=CO What to Monitor Monitoring the UnitBoard Status for DSX-1-Compatible Unit Board StatusBoard Status for V.35-Compatible Unit Performance Statistics Performance Statistics for V.35-Compatible Unit Performance Statistics for DSX-1-Compatible UnitRemote Unit Information DSX-1-Compatible Unit Front Panel LEDsMeaning Compatible Unit Detecting a Problem TestingUnderstanding Loopback Tests Local Loopback, Initiated at the CO Unit Local LoopbacksRemote Loopback, Initiated at the CO Unit Remote LoopbacksStarting and Stopping Loopbacks Resetting the Unit Worksheets DSX-1-to-DSX-1 Configuration LAN DSX-1-to-V.35 ConfigurationTime Slot DS0 Assignments Unframed OperationPayload Rate DSX-1 T1 DS0s Used Compatible Units Configuration Worksheet DSX-1-Compatible Units Configuration WorksheetTerminal Connection Cable Pin Assignments Cable Pin AssignmentsPin Hdsl Loop Connection Cable Pin AssignmentsT1 Network Connection Cable Pin Assignments Direction Code Pin Name Connection Cable Pin AssignmentsFunction Description Jumper Pins Factory-Setting Switchpacks and JumpersDSX-1-Compatible Units Switchpacks and Jumpers Compatible Units Jumper P8 Glossary Factory defaultsGL-1 COM portGL-2 ResetLoopback IN-1 IndexIndex IN-2