Adtran TRC6410L2X 사용자 설명서
Section 8 Troubleshooting Guide
TRACER 6000 Series Integrated System Manual
128
Copyright © 2005 ADTRAN, Inc.
612806420L1-1D
5.
INSTALLING/TROUBLESHOOTING THE TRACER HARDWARE
1. Perform a detailed path profile and link budget for each TRACER 64x0 microwave link. A
thorough path study can be used to estimate signal power budgets, estimate fade margins at each
receiver, identify potential line-of-site obstacles, properly size antenna dishes, and determine
minimum antenna dish heights above the earth.
receiver, identify potential line-of-site obstacles, properly size antenna dishes, and determine
minimum antenna dish heights above the earth.
2. Set up all of the TRACER 64x0 hardware on a workbench. The actual cables used in the
permanent installation should be used in the workbench setup. A rigorous workbench “simulation”
of the link will help alleviate and avoid time-consuming errors.
of the link will help alleviate and avoid time-consuming errors.
3. Examine the
PLAN A
and
PLAN B
LEDs on the front panel of each unit. These LEDs indicate the
frequency plan for each TRACER 64x0 unit. Each TRACER link must have a Plan A radio on one
side and a Plan B radio on the other.
side and a Plan B radio on the other.
4. Attach the RF coaxial cables to be used in the permanent installation to the N-type connectors on
the back of the TRACER 64x0 unit. Attach the other end of the coaxial cable(s) to an RF power
meter or spectrum analyzer, if either is available. The power measured by the meter/analyzer is the
RF power available at the input of the antenna. The TRACER 64x0 unit is programmed at the
factory to output approximately 100 mW (20 dBm) of RF power. The actual power level measured
by the meter/analyzer will be less than 100 mW due to RF losses through the coaxial cable, and is
a function of the cable type and length being used. In any event, the power level at the output of
the coaxial cable should be a significant fraction of 100 mW. A power meter/analyzer reading that
is not on the order of at least tens-of-milliwatts could be an indication of unsuitable RF cable or
faulty or unreasonably long coaxial cable, or a combination of these factors.
meter or spectrum analyzer, if either is available. The power measured by the meter/analyzer is the
RF power available at the input of the antenna. The TRACER 64x0 unit is programmed at the
factory to output approximately 100 mW (20 dBm) of RF power. The actual power level measured
by the meter/analyzer will be less than 100 mW due to RF losses through the coaxial cable, and is
a function of the cable type and length being used. In any event, the power level at the output of
the coaxial cable should be a significant fraction of 100 mW. A power meter/analyzer reading that
is not on the order of at least tens-of-milliwatts could be an indication of unsuitable RF cable or
faulty or unreasonably long coaxial cable, or a combination of these factors.
5. Resolve all RF coaxial cabling errors before proceeding.
6. Attach the RF coaxial cables to a high-quality attenuator, if possible. If you do not have an
attenuator, attach the coaxial cables to the antennas to be used in the permanent installation. If the
installation antennas are not available, small, inexpensive dipole or patch antennas can be used for
verification purposes. If an adjustable attenuator is being used, dial in the amount of attenuation
that corresponds to the path loss value expected for the microwave link in which the TRACER
hardware will be installed. The path loss value can be calculated from a knowledge of the path
length, or provided by a path study. Remember to subtract both antenna gain values from the
attenuator level if these values have not already been accounted for.
installation antennas are not available, small, inexpensive dipole or patch antennas can be used for
verification purposes. If an adjustable attenuator is being used, dial in the amount of attenuation
that corresponds to the path loss value expected for the microwave link in which the TRACER
hardware will be installed. The path loss value can be calculated from a knowledge of the path
length, or provided by a path study. Remember to subtract both antenna gain values from the
attenuator level if these values have not already been accounted for.
7. After setting up the RF pieces, examine the
RF DOWN
LED on the front panel of each
TRACER 64x0 unit. If the
RF DOWN
LED is illuminated (red), the corresponding TRACER 64x0
is not receiving a suitable RF signal from the other TRACER 64x0 unit. In this case, the receiving
TRACER 64x0 is either receiving a very weak signal or no signal at all. If the
TRACER 64x0 is either receiving a very weak signal or no signal at all. If the
RF DOWN
LED is
not illuminated, then the TRACER 64x0 units are receiving a suitable RF signal. Suitable RF
power levels for low error rate communication range from -30 dBm to -88 dBm measured at the
N-type connector input on the TRACER 64x0 unit.
power levels for low error rate communication range from -30 dBm to -88 dBm measured at the
N-type connector input on the TRACER 64x0 unit.
8. Resolve any signal level issues before proceeding.
9. Examine the
RF LOW
LED on the front panel of each TRACER 64x0. If this LED is illuminated,
then the TRACER 64x0 is receiving a relatively weak signal; however, if the
RF DOWN
LED is
not illuminated, then the received signal is being suitably processed by the TRACER 64x0 system.
If you are receiving a weak signal (
If you are receiving a weak signal (
RF LOW
is
ON
), please verify that the weak signal is not being
caused by a faulty cable, an insufficiently tightened cable, or some other installation-related
problem. Also, make sure an unreasonably large attenuation value has not been selected if you are
using an attenuator on a workbench setup.
problem. Also, make sure an unreasonably large attenuation value has not been selected if you are
using an attenuator on a workbench setup.