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Cisco GS7000 Troubleshooting Manual

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Troubleshooting
This troubleshooting section lists common problems and their solutions. If a troubleshooting procedure directs
you to replace a module of the 1.2 GHz GS7000 Remote PHY Device (RPD) 2X2 Segmentable Node, see
Removing and Replacing
No RF Output at Receiver RF Test Point: Optical Power LED on
Receiver Module is off
Follow this troubleshooting flowchart. Also see the notes following the chart.
Modules.
No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off, on page 1
Troubleshooting
1

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  Summary of Contents for Cisco GS7000

  • Page 1: Table Of Contents

    Troubleshooting This troubleshooting section lists common problems and their solutions. If a troubleshooting procedure directs you to replace a module of the 1.2 GHz GS7000 Remote PHY Device (RPD) 2X2 Segmentable Node, see Removing and Replacing Modules. • No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off, on page 1 •...
  • Page 2 Troubleshooting No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off These notes apply to the previous troubleshooting flowchart. Note Description For standard receiver For low input receiver This unit will have no RF output. This unit will have no RF output.
  • Page 3: No Rf Output: Fiber Optic Light Level Is Good, Receiver Optical Power Led Is On

    Troubleshooting No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on Follow this troubleshooting flowchart. Also see the notes following the chart. These notes apply to the previous troubleshooting flowchart.
  • Page 4: Poor C/N Performance

    Troubleshooting Poor C/N Performance Note Description For standard receiver For low input receiver If the green LED is Off, it is outside optical If the green LED is Off, it is outside optical input range. Green (On) indicates that light is input range.
  • Page 5 Troubleshooting Poor C/N Performance These notes apply to the previous troubleshooting flowchart. Note Description RF drive level to the laser must be set to the laser manufacturer’s specification. It is possible that the distribution module is set up incorrectly. See the pad and equalizer selection charts in Appendix A for correct pad and equalization.
  • Page 6: Poor Distortion Performance

    Troubleshooting Poor Distortion Performance Note Description It is important to monitor the DC level at the receiver module because in the process of cleaning the connectors, the transfer of light through each connector may improve or degrade. The DC reading should degrade if there is a reflection in the path depending on the severity of the core mismatch.
  • Page 7 Troubleshooting Poor Distortion Performance These notes apply to the previous troubleshooting flowchart. Note Description Recommended RF input levels are: • Headend transmitter module: 14 dBmV Based on 79-channel loading. The input will increase as the channel loading decreases. Note Troubleshooting...
  • Page 8: Poor Frequency Response

    Attenuate the light to simulate the amount of light that should be at the 1.2 GHz GS7000 Node and rerun the distortion performance. If the distortion performance improves, there is too much light.
  • Page 9: No Rf Output From Reverse Receiver

    Troubleshooting No RF Output from Reverse Receiver These notes apply to the previous troubleshooting flowchart. Note Description Be sure all unused ports are properly terminated into 75 ohms to prevent mismatches. The frequency response is cumulative and reflects the response of each active device in the link: •...
  • Page 10: Reference: 2X2 Rpd Module Leds

    Troubleshooting Reference: 2x2 RPD Module LEDs Reference: 2x2 RPD Module LEDs This section contains LED definition for the 2x2 RPD module. It provides a coarse-grained indication of device connectivity to field technicians during their installation or repair of the RPD. LED Pattern or Color State Indicated Notes...
  • Page 11 Troubleshooting Reference: 2x2 RPD Module LEDs LED Pattern or Color State Indicated Notes Indicates that the RPD has received and U-RF 2 Hz Flash Pattern At least one upstream channel LEDs configuration received (and a applied at least one upstream channel configuration MAP was received for that channel), awaiting upstream...
  • Page 12 Troubleshooting Reference: 2x2 RPD Module LEDs Troubleshooting...