Cisco Cisco 1 GHz GainStar Node Installationsanleitung
Troubleshooting
45
Possible Cause
Solution
Low or degraded reverse RF signal at
the reverse input test point(s).
the reverse input test point(s).
Verify that the line extender is receiving the
proper reverse RF input signals from the
downstream amplifiers.
Important: You cannot balance the line
extender without the proper reverse RF input
signals.
proper reverse RF input signals from the
downstream amplifiers.
Important: You cannot balance the line
extender without the proper reverse RF input
signals.
There is proper reverse RF signal at
the reverse input test point, but low
or degraded signal at the reverse
output test point.
the reverse input test point, but low
or degraded signal at the reverse
output test point.
Measure the main reverse input test point and
the reverse output test point. Subtract the
reverse amplifier gain and add the pad values
and EQ insertion loss to verify proper reverse
amplifier gain.
Verify that all the proper accessories, pads,
EQs, and signal directors (if applicable) are
firmly installed in the correct locations of the
GainStar Line Extender.
Verify that the factory installed accessories
are firmly installed in the correct locations.
Verify that any unused RF ports are properly
terminated.
Use a spectrum analyzer to look at the reverse
RF input signal spectral quality at each
reverse input test point and compare it with
the reverse RF output signal spectral quality.
the reverse output test point. Subtract the
reverse amplifier gain and add the pad values
and EQ insertion loss to verify proper reverse
amplifier gain.
Verify that all the proper accessories, pads,
EQs, and signal directors (if applicable) are
firmly installed in the correct locations of the
GainStar Line Extender.
Verify that the factory installed accessories
are firmly installed in the correct locations.
Verify that any unused RF ports are properly
terminated.
Use a spectrum analyzer to look at the reverse
RF input signal spectral quality at each
reverse input test point and compare it with
the reverse RF output signal spectral quality.
Reverse RF signal still low or
degraded.
degraded.
If degradation is generated in the reverse
amplifier, replace the RF mainboard of the
GainStar Line Extender.
If degradation is generated by the
downstream amplifier reverse RF signal,
troubleshoot the RF amplifier feeding this
station.
Replace the RF mainboard of the GainStar
Line Extender.
amplifier, replace the RF mainboard of the
GainStar Line Extender.
If degradation is generated by the
downstream amplifier reverse RF signal,
troubleshoot the RF amplifier feeding this
station.
Replace the RF mainboard of the GainStar
Line Extender.