Troubleshooting

This troubleshooting section lists common problems and their solutions. If a troubleshooting procedure directs you to replace a module of the node, see Removing and Replacing Modules.

OIB

There are 3 LEDs on the OIB, Heartbeat LED, Communication LED, and Power LED.

Condition

Power LED

Heartbeat LED

Communication LED

Normal

On

Steady blink

Steady blink

Normal behavior

Power supply fault

Off

Off

Off

Check power supply and power supply voltages. Check cabling and that the appropriate power shunts are installed in the launch amplifier.

Error #1

On

Not blink

Not blink

If Heartbeat LED and Communication LED blink on power up and then stay off, problem is with boot. Can be a device failure or software is not loaded. Try cycling power.

Error #2

On

Steady blink

Not blink

OS is ok but node control software is not running or is stuck. If this condition persists for more than a minute or two after power up, check all the cables connecting the lid and launch amplifier. Try cycling power.

Error #3

On

Not blink

Steady blink

This condition should not be possible unless Heartbeat LED is damaged.

Troubleshooting the node

Problem

Solution

Node is not powered up

  • Verify that power is connected to the proper inputs and the powering shunts/fuses are correctly installed.

  • Verify that power supply is installed in the correct power supply slot.

  • Verify that AC input power is within the operating range (45 to 90 VAC rms).

  • Verify DC outputs on power supply test points.

No power, all LEDs are off

Check whether shunt fuse and node power supply module have been installed correctly.

Only Power LED is on, the other two LEDs are off

Software OS may be not boot up correctly, cycling power supply or press OIB reset button using a hard slim object through the reset hole.

No RF output on one or more forward RF ports

  • Verify that the ports are turned on with LCS.

  • Verify input cabling and the RF input levels are as expected.

  • Verify the Fwd RF cable between OIB and Launch amp is connected properly.

  • Verify iRPD is operating.

No RF output on one or more reverse RF ports

  • Verify segmentation setting with LCS.

  • Verify if there is RF port cabling and the RF input levels are as expected.

  • Verify the reverse RF cable between OIB and launch amplifier is connected properly.

AGC does not lock

  • Verify the RF configuration settings.

  • Verify the USB cable connection in LCS.

Can not control with LCS software

Check whether the USB cable connect correctly and refer to Cisco GS7000 Super High Output Intelligent Node Software Installation and Configuration Guide to see whether USB connection mode on mobile phone has been configured correctly.

Poor reverse C/N performance

  • Check if the headend performance meets system design target.

  • Measure level of RF input to RPD and check if the RF input level is correct.

Noise on reverse path

Look at the reverse path to determine which port(s) are noisy. Using max hold makes it easier to see bursty noise signals.

Poor frequency response

  • Ensure RF cables are connected properly.

  • Ensure that the diplexers match the installed splitter.