Daktronics

How do I troubleshoot A-1778 Transition Networks converters?

Topic

  • How do I troubleshoot A-1778 Transition Networks converters?

Environment

  • Product: A-1778 fiber Ethernet media converters
  • Components:
  • Control System:

Steps

  • The A-1778 media converter has a single switch on it; LINK ALERT, and can be enabled or disabled.  Daktronics ships media converters with the switch set to the enabled state.
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  • When set to ENABLE the media converter does not act as an endpoint and an Ethernet link present on the device plugged into the converter indicates that the entire system is working and there is an Ethernet link present on the device on the other converter.
    • If there is a break in the system at any point between the devices plugged into the converters no Ethernet link will be present (ex. broken fiber, bad network cable, failed media converter, failed network jack).
  • When set to DISABLE the media converter does act as an endpoint and can be used to troubleshoot the system.  The expected results when set to disabled are as follows:
    • LINK ALERT disabled on building side media converter:
      • Plugging a laptop into the media converter will allow you to test the laptop's Ethernet jack, the Ethernet jack on the media converter, and the cable being used to connect them (regardless of the condition of the attached fiber, converter at the sign, or the sign itself).  Laptop plugged into the converter should show an Ethernet link.  
    • LINK ALERT enabled on building side media converter and disabled on the converter at the sign:
      • Laptop plugged into media converter at the building will show an Ethernet link if the following are true:
        • Laptop, Ethernet cable, building media converter, fiber being ran from TX on the sign converter to RX on building converter is working.
      • Laptop plugged into media converter at the building will not show an Ethernet link if one of the following is true:
        • Problem with the Ethernet portion of the connection from laptop to building media converter (testable via disabling switch above).
        • Problem with fiber running from TX on sign converter to RX on building converter.
          • Fiber can be flipped at both converters to test if one of the fibers is bad.
        • Problem with the fiber port on either converter.
          • Port can be tested by using a single fiber to loop across the ports on the converter.  When the switch is in the ENABLE state a laptop will show Ethernet link.
    • LINK ALERT disabled on sign media converter:
      • An Ethernet link on the controller (typically indicative by the sign booting up and showing an IP address) is indicative of the Ethernet port on the controller, the cabling between it and the media converter, and the Ethernet port on the media converter working (regardless of the condition of the attached fiber or building media converter).

KB ID: DD4111613

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