ADTRAN 12804108L1A System Manual

ADTRAN 12804108L1A System Manual Manual pdf 58 page image

Section 6 Troubleshooting Guide TRACER 4108/4208 System Manual58 © 2003 ADTRAN, Inc. 612804208L1-1BBlue AlarmA remote alarm (alarm indication signal or AIS) is generated by the attached equipment. The rootcause must be determined at the attached equipment. A typical cause of a blue alarm is a lack of inputto a CSU.Recommended Actions:1.Verify the input to any attached data equipment.BPVBipolar violations (BPVs) indicate an improper configuration or faulty wiring.Recommended Actions:1.Verify the TRACER 4108/4208 unit and the attached equipment are configured for the same linecoding (B8ZS or AMI).2.Verify the cable connections for the T1 interface are solid.3. RF ERRORSRF 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 RFinterference. These types of errors are remedied by performing a detailed line-of-site microwave pathstudy to determine whether a microwave link is feasible for the terrain and environment underconsideration.If after performing a microwave path study the system is still not operational, ensure that the antennas areproperly aligned. Note that alignment must be achieved in both elevation and azimuth for optimal linkperformance. The TRACER 4108/4208 can be used to aid in antenna alignment by looking at the R XP OWER “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 will correspond to amaximum level on the Rx Power “fuel gauge” on the TRACER 4108/4208 terminal display or maximumvoltage at the RSSI front panel test jack. Consult the ADTRAN TRACER Data Sheet included with theunit to verify that the actual receive signal level agrees with the calculated receive signal.An RSSI test point, located on the front panel, represents the voltage (relative to the GND test point) of arelative signal level of receive strength from the far end. The voltage at this test point can vary fromapproximately 0 to 5 Volts DC. An RSSI Calibration sheet is shipped with the system to provide theinstaller a cross-reference between actual received signal level (in dBm) and RSSI voltage. This sheet isuseful for verifying link budget calculations and ensuring proper equipment installation.4. STEP-BY-STEP TROUBLESHOOTINGThe logical troubleshooting flow presented in this section can be used to set up your TRACER 4108/4208system, and also to diagnose a previously installed system. Please contact ADTRAN Technical support atany stage during installation and/or troubleshooting if you require assistance.5. INSTALLING/TROUBLESHOOTING THE TRACER HARDWARE1. Perform a detailed path profile and link budget for each TRACER 4108/4208 microwave link. Athorough path study can be used to estimate signal power budgets, fade margins at each receiver,

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