Adtran TRC4206L1 Manual Do Utilizador
TRACER 4206 System Manual
Section 6, Troubleshooting Guide
612804206L1-1A
© 2002 ADTRAN, Inc.
65
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 4206 unit. The frequency plan (PLAN A, PLAN B) LED should
be the opposite on both TRACER 4206 units.
frequency plan for each TRACER 4206 unit. The frequency plan (PLAN A, PLAN B) LED should
be the opposite on both TRACER 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 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 4206 unit is programmed at
the factory to output approximately 100 mW (20 dBm) of 5.8 GHz 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.
the base of the TRACER 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 4206 unit is programmed at
the factory to output approximately 100 mW (20 dBm) of 5.8 GHz 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 5.8 GHz 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.
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.
7.
After setting up the RF pieces, examine the RF DOWN LED on the front panel of each TRACER
4206 unit. If the RF DOWN LED is illuminated (red), the corresponding TRACER 4206 is not
receiving a suitable RF signal from the other TRACER 4206 unit. In this case, the receiving
TRACER 4206 is either receiving a very weak signal, or no signal at all. If the RF DOWN LED is
not illuminated, then the TRACER 4206 units are receiving a suitable RF signal. Suitable RF
power levels for low error rate communication will range from -30 dBm to -92 dBm measured at the
N-type connector input on the TRACER 4206 unit.
4206 unit. If the RF DOWN LED is illuminated (red), the corresponding TRACER 4206 is not
receiving a suitable RF signal from the other TRACER 4206 unit. In this case, the receiving
TRACER 4206 is either receiving a very weak signal, or no signal at all. If the RF DOWN LED is
not illuminated, then the TRACER 4206 units are receiving a suitable RF signal. Suitable RF
power levels for low error rate communication will range from -30 dBm to -92 dBm measured at the
N-type connector input on the TRACER 4206 unit.
8.
Resolve any signal level issues before proceeding.
9.
Examine the RF LOW LED on the front panel of each TRACER 4206. If this LED is illuminated,
then the TRACER 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.
then the TRACER 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.
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 4206 unit and run pattern from the connected T1
equipment. This will verify data path between the T1 equipment and the TRACER 4206 unit.
External pattern generators are required to test data path integrity. A T1 BERT tester is
suggested.
suggested.