Adtran TRC4208 Manuel D’Utilisation

Section 6  Troubleshooting Guide

TRACER 4208 System Manual

 58

© 2003 ADTRAN, Inc.

612804208L1-1A

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

1.Verify the TRACER 4208 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.

RF errors can range anywhere 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 4208 can be used to aid in antenna alignment by looking at the 

 

“fuel gauge” on the System Status or System Configuration menu pages. Optimal antenna alignment will 
correspond to the maximum number of RSSI bars on the TRACER 4208 terminal display.

The logical troubleshooting flow presented in this section can be used to set up your TRACER 4208 
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.

1. Perform a detailed path profile and link budget for each TRACER 4208 microwave link. A 

thorough path study can be used to estimate signal power budgets, fade margins at each receiver, 
identity potential line-of-site obstacles, properly size antenna dishes, and determine minimum 
antenna dish heights above the earth.

2. Setup all of the TRACER hardware on a workbench. ADTRAN recommends that the actual cables 

used in the permanent installation be used in the workbench setup. A rigorous workbench 
“simulation” of the link will help alleviate and avoid time-consuming errors.

3. Examine the 

 and 

 LEDs on the front panel of each unit. These LEDs indicate the 

frequency plan for each TRACER 4208 unit. The frequency plan (Plan A, Plan B) LED should be 
the opposite on the TRACER 4208 units. 

 and can be used online or