ADTRAN 4106 Plan A, 4206 Plan A system manual RF Errors, STEP-BY-STEP Troubleshooting

Page 58

Section 6 Troubleshooting Guide

TRACER 4106/4206 System Manual

 

 

Blue Alarm

A remote alarm (alarm indication signal or AIS) is generated by the attached equipment. The root cause must be determined at the attached equipment. A typical cause of a blue alarm is a lack of input to a CSU.

Recommended Actions:

1. Verify the input to any attached data equipment.

BPV

Bipolar violations (BPVs) indicate an improper configuration or faulty wiring.

Recommended Actions:

1.Verify the TRACER 4106/4206 unit and the attached equipment are configured for the same line coding (B8ZS or AMI).

2.Verify the cable connections for the T1 interface are solid.

3.RF ERRORS

RF errors can range from a nonviable microwave path to loose RF connectors.

Nonviable path conditions could be caused by physical obstructions such as buildings, moutainous terrain, trees, etc., as well as other physical limitations such as excessive path distances and in-band RF interference. These types of errors are remedied by performing a detailed line-of-site microwave path study to determine whether a microwave link is feasible for the terrain and environment under consideration.

If after performing a microwave path study the system is still not operational, ensure that the antennas are properly aligned. Note that alignment must be achieved in both elevation and azimuth for optimal link performance. The TRACER 4106/4206 can be used to aid in antenna alignment by looking at the RX POWER “fuel gauge” on the System Status or System Option menu pages or by measuring the DC voltage (relative to ground) at the RSSI front panel test jack. Optimal antenna alignment is achieved by peaking the front panel RSSI voltage or the the Rx Power "fuel gauge" on the TRACER 4106/4206 terminal diplay. Consult the ADTRAN TRACER Data Sheet included with the unit to verify that the actual receive signal level agrees with the calculated receive signal.

An RSSI test point, located on the front panel, provides a DC voltage level (relative to the GND test point) that corresponds to the amount of signal being received from the far end's transmitter. The voltage at this test point can vary from approximately 0 to 5 Volts DC. An RSSI Calibration sheet is shipped with the system to provide the installer a cross-reference between actual received signal level (in dBm) and RSSI voltage. This sheet is useful for verifying link budget calculations and ensuring proper equipment installation.

4.STEP-BY-STEP TROUBLESHOOTING

The logical troubleshooting flow presented in this section can be used to set up your TRACER 4106/4206 system, and also to diagnose a previously installed system. Please contact ADTRAN Technical support at any stage during installation and/or troubleshooting if you require assistance.

58

© 2004 ADTRAN, Inc.

612804206L2-1A

Image 58
Contents Tracer 4106/4206 To the Holder of the Manual TrademarksAbout this Manual Revision History Safety Instructions Save These Important Safety InstructionsFCC-Required Information Radio Frequency Interface StatementFCC Output Power Restrictions Exposure to Radio Frequency FieldsRepair and Return Pre-Sales Inquiries and Applications SupportPost-Sale Support Installation and Maintenance SupportTraining Table of Contents Table of Contents Tracer 4106/4206 System Manual System Description System Overview Features and BenefitsConfiguration and Management OperationalReceiver Sensitivity Antenna Information Receiver PowerLine-of-Sight Other ConsiderationsADTRAN, Inc Decibels LINE-OF-SIGHTTerminology Calculating the Fade MarginReceiver Power Transmitted Power PT Antenna GainPath Distance d Carrier Wavelength λSystem Losses L Path Loss LP Typical Coaxial Loss for Common Cable TypesReceiver Sensitivity T1 PortsTracer Rssi Test Points Antenna InformationAntenna Alignment Antenna Beam PatternsFresnel Zones, Earth Curvature, & Antenna Heights Path Availability Other ConsiderationsTerrain Terrain Factor Description Values normally used are listed below Climate Climate Factor DescriptionAt-A-Glance Specifications Reviewing the Front Panel DesignReviewing the Front Panel Design Equipment DimensionsPower Requirements Rssi Monitoring InterfaceReviewing the Tracer 4106/4206 Rear Panel Design Rear Panel Description Name Connector DescriptionRS-232 Connection DB-25 Terminal Use RS-232 Connection PinoutRS-232 Connection Modem Use Tracer 4106/4206 DCE to Terminal DTE Diagram DB-25Tracer 4106/4206 DCE to Personal Computer DB-9 T1 Connections RJ-48C T1 Interface Connector PinoutTracer 4106/4206 DCE to Modem DCE DB-25 Antenna Interface N-Type connector Alarm Contacts Plug-In Terminal BlockDC Power Connection Plug-In Terminal Block FuseAT-A-GLANCE Specifications Hardware Description Specification TransmitterVT100 Terminal Interface Engineering Guidelines Tracer 4106/4206 System Manual Network Turnup Procedure Unpack and Inspect the SystemTools Required Contents of Adtran ShipmentIntroduction Unpack and Inspect the SystemCustomer Provides Channel SelectionGrounding Instructions Mounting Options Supplying Power to the UnitInstructions for Rackmounting the Tracer 4106/4206 Connecting the T1 Interface Inch Rackmount IllustrationUser Interface Guide Menu DescriptionsNavigating the Terminal Menu Terminal Menu WindowTerminal Menu and System Control Navigating using the Keyboard KeysPassword Protection To do this Press this keyContact Information Menu DescriptionsElapsed Time RF StatusTx Power T1 Status Error/Alarm OnlyRx Power Remote Tracer StatusMain Menu Tracer System Options Tracer System Options RF Bandplan Receiver Sensitivity for the Tracer 4106/4206 Receiver Sensitivity Active BandwidthResets all system error counters for the Tracer 4106/4206 T1x Status/Configuration/Loopback T1 Interface AlarmsT1X STATUS/CONFIGURATION/LOOPBACK T1X Line Build OUT T1 Remote Link Loopback T1X Performance History Installing/Troubleshooting the Tracer Hardware OverviewTST LED LED Indicators PWR LEDOverview RF Down LEDT1 Interface Alarm LEDs RF LOW LEDRF Errors STEP-BY-STEP TroubleshootingINSTALLING/TROUBLESHOOTING the Tracer Hardware Installing/Configuring T1 Hardware