DBAS Codenoll - Tech Support

Troubleshooting 8311

1.0 General

This chapter describes procedures for troubleshooting an installed CodeNet card. You can usually ascertain whether or not your card is functioning correctly by observing the activity of the diagnostic / activity LEDs located on the front panel of the card.

If the red partition LED stays on continuosly, or if communication cannot be established to or from that segment, then the segment and/or the MultiStar connection is faulty. The following section lists some trouble shooting suggestions for the 8311.
LED Name LED State Indications/Corrective Action
Partition Off Normal Segment Operation

A partition LED that does not illuminate when the manual partition switch is used may indicate one of the following conditions:

  • MultiStar Hub not powered

    Check power and power indicator on controller card.

  • The CodeNet MultiStar module is not well seated or properly inserted into back plane.

    Make sure that the module is well seated and screwed into the face plate.

  • Defective MultiStar Repeater or back plane connector.

    Insert into another good slot. Insert into known good MultiStar.

  • Defective CodeNet module

    Try known good CodeNet MultiStar module.
  • Partition On Steady The partition LED turns on steady when the segment is partitioned (either manually or autopartitioned). A partitioned segment may indicate one of the following conditions:

  • The CodeNet MultiStar Module is not well seated into the backplane.

    Make sure that the module is well seated and screwed into the faceplate.

  • Segment manually partitioned

    To reset the PARTITION indicator, move the toggle switch to the full up position then release. If you can't reset the LED with the toggle switch, the segment is autopartitioned or defective.

  • Segment automatically partitioned after 64 consecutive collisions.

    Troubleshoot the network. Look for a station that is transmitting continuosly. Power down all devices on the segment and repower one at a time.

  • Segment automatically partitioned due to "long" collision activity.

    Troubleshoot the network. Look for a station that is transmitting continuously for six milli-seconds or more.

    Power down all devices on the segment and repower one at a time.

  • The CodeNet MultiStar Module is faulty.

    Swap out the module to see if this action resolves the problem.

  • The controller card is faulty.

    Swap out the controller card to see if this action resolves the problem.
  • Partition Flash-
    The partition LED flashes when a problem with a partitioned segment has been resolved. Use the partition switch to clear the flashing red LED.

    If a segment's partition LED blinks, push up the partition switch to clear the flashing autopartition indication.

    The partition switch does not reset an autopartitioned segment. The repeater reconnects (clears the autopartition) when the problem that caused the autopartitioning is resolved. The partition switch only turns off the flashing partition LED.

    A flashing partition LED may indicate:

  • Occurence and resolution of any of the problems described above.

  • Excessive use of the network causing collisions.

    If this situation doesn't degrade network performance, then you don't need to take corrective action. If the netowrk performance is affected, you may need to reconfigure the network in a way that solves the excessive use problem.
  • Activity Off Under normal conditions, the activity LED flashes as the module receives data packets from the device to which it is attached.

    If an activity LED doesn't flash, or if a station can't establish communication with another station through the MultiStar the problem could lie in either:

  • the fiber optic cable;
  • the MultiStar modules;
  • the CodeNet-83X1 station at the other end; or
  • the MultiStar base unit.

    First check to see if any of the Low Light indicators are lit on any of the units. If they are, see the Low Light On section.

    If the fiber optic cables are intact and no Low Light indicators are on, try moving the MultiStar modules into other slots in the MultiStar or connecting the stations to known good MultiStar modules. If the connection is still not established between stations, the problem is either in the MultiStar unit or the CodeNet 8311 units at the stations. Systematically replace MultiStar and the CodeNet units in the workstations with known good units.
  • Low Light Steady On
  • A Fiber Break or Link Fault condition has been detected.

  • In the case of SMA 906 connectors, verify that the half-length alignment sleeves are securely attached to the tips of the fober optic cable terminations that attach to the 8311 (this is not relevant to ST connectors).

  • Verify that the optical fiber cables are securely connected to their respective optical connectors and thet they are not broken. You can do this by connecting the optical source and power meter (as instructed by manufacturer) to the ends of the cable.

  • A simple pen light is an excellent optical source if a power meter is not available. Check by shining the light source in one end of the cable. If you detect light emitting from the other end, the cable is intact. If no light is detected, the cable is broken. Replace cable.

  • Verify that the optical losses don't exceed the CodeNet 8311 receiver sensitivity.

  • If the low light level LED is on, check to make sure that the cables are connected properly and, if using SMA 906 connectors, that the half-length alignment sleeves are on the tips of the connectors. If the low light level LED remains on, disconnect the RX fiber from the 8311 and connect it to an optical power meter (CodeNet CTC-2000 or equivalent). If the average optical poweris less that -30 dBm, there is excessive loss in the fiber or the companion unit's transmitter is not supplying sufficient power. Try cleaning the fiber ends with a soft cloth or lint-free paper dampened in alcohol and test the transmitter output of the companion unit.
  • If the CodeNet MultiStar Modules don't operate properly, follow the steps listed here to verify correct installation:

    (1) Verify that the network connectors are securely attached.

    (2) Ensure that the interconnecting cables used meet Codenoll standards.

    (3) Allow five minutes of warm-up time in extreme cold conditions to allow for temperature stabilization inside the units.

    (4) Verify that all appropriate alignment sleeves are in place.

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