Cisco Cisco 1 GHz GainStar Node 설치 가이드
Chapter 4 Troubleshooting
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Miscellaneous Problems
Complete the following steps to troubleshoot miscellaneous problems.
Miscellaneous problems troubleshooting table
Possible Cause
Solution
No RF signal present in
the network.
the network.
Check the network power supply.
Verify that the power is present at the node power supply.
Verify that the optical signal is present on the fiber.
Verify that the voltage level on the optical receiver is the
same as it was in the commission.
Verify that the output RF is present at the forward output
test point.
Verify that the power is present at the node power supply.
Verify that the optical signal is present on the fiber.
Verify that the voltage level on the optical receiver is the
same as it was in the commission.
Verify that the output RF is present at the forward output
test point.
Poor pictures in the
network.
network.
Check the RF input level at the transmitter.
Check the optical output of the transmitter.
Check the optical level at the forward optical receiver.
Check and clean fiber connectors. See Cleaning Optical
Connectors.
Check the RF level at the GainStar Mini Node outputs.
Check the optical output of the transmitter.
Check the optical level at the forward optical receiver.
Check and clean fiber connectors. See Cleaning Optical
Connectors.
Check the RF level at the GainStar Mini Node outputs.
No RF output from the
headend or hub reverse
optical receiver.
headend or hub reverse
optical receiver.
Check the fiber connector in the headend or hub.
Check the optical input level of the fiber.
Check the fiber connections.
Check the reverse transmitter in the node.
Check the RF input level to the transmitter in the node.
Ensure that the cable is connected and not crushed.
Check the RF at the amplifier reverse input test point.
Check the optical input level of the fiber.
Check the fiber connections.
Check the reverse transmitter in the node.
Check the RF input level to the transmitter in the node.
Ensure that the cable is connected and not crushed.
Check the RF at the amplifier reverse input test point.
Excessive noise in return. Check the fiber connections and clean if necessary.
Check the noise level at the transmitter test point.