Adtran TRC4106 Manual Do Utilizador
TRACER 4206 System Manual
Section 6, Troubleshooting Guide
612804206L1-1B
© 2002 ADTRAN, Inc.
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3. Examine the PLAN A and PLAN B lights on the front panel of each unit. These LEDs indicate the
frequency plan for each TRACER 4106/4206 unit. The frequency plan (PLAN A, PLAN B) LED
should be the opposite on both TRACER 4106/4206 units.
should be the opposite on both TRACER 4106/4206 units.
4. Attach the RF coaxial cables to be used in the permanent installation to the N-type connectors on
the base of the TRACER 4106/4206 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 will be the RF power available at the input of the antenna. The TRACER
4106/4206 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 cable type and length of cable 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 any combination of either unsuitable RF, faulty, or
unreasonably long coaxial cable.
power meter or spectrum analyzer if either is available. The power measured by the
meter/analyzer will be the RF power available at the input of the antenna. The TRACER
4106/4206 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 cable type and length of cable 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 any combination of either unsuitable RF, faulty, or
unreasonably long coaxial cable.
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 be 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 be accounted for.
7. After setting up the RF pieces, examine the RF DOWN LED on the front panel of each TRACER
4106/4206 unit. If the RF DOWN LED is illuminated (red), the corresponding TRACER 4106/4206
is not receiving a suitable RF signal from the other TRACER 4106/4206 unit. In this case, the
receiving TRACER 4106/4206 is either receiving a very weak signal, or no signal at all. If the RF
DOWN LED is not illuminated, then the TRACER 4106/4206 units are receiving a suitable RF
signal. Suitable RF power levels for low error rate communication will range from -30 dBm to -100
dBm for the 4106 and -30 dBm to -96 dBm for the 4206 measured at the N-type connector input on
the TRACER unit.
is not receiving a suitable RF signal from the other TRACER 4106/4206 unit. In this case, the
receiving TRACER 4106/4206 is either receiving a very weak signal, or no signal at all. If the RF
DOWN LED is not illuminated, then the TRACER 4106/4206 units are receiving a suitable RF
signal. Suitable RF power levels for low error rate communication will range from -30 dBm to -100
dBm for the 4106 and -30 dBm to -96 dBm for the 4206 measured at the N-type connector input on
the TRACER unit.
8. Resolve any signal level issues before proceeding.
9. Examine the RF LOW LED on the front panel of each TRACER 4106/4206. If this LED is
illuminated, then the TRACER 4106/4206 is receiving a relatively weak signal, however if the RF
DOWN LED is not illuminated, the received signal is being suitably processed by the TRACER
system. 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 work bench setup.
DOWN LED is not illuminated, the received signal is being suitably processed by the TRACER
system. 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 work bench setup.
Use the tables in Section 2, Microwave Path Engineering Basics, of this manual to select the
proper free-space attenuation value (in dB) based on the estimated length of the microwave path.
Remember to subtract out both antenna gains (local and remote) from the attenuator setting.
proper free-space attenuation value (in dB) based on the estimated length of the microwave path.
Remember to subtract out both antenna gains (local and remote) from the attenuator setting.
10. Command a link loopback in one TRACER 4106/4206 unit and run pattern from the connected T1
equipment. This will verify data path between the T1 equipment and the TRACER 4106/4206 unit.