VNswitch LEDs

This section describes how to diagnose and solve problems using the light-emitting diode (LED) displays on the front panel of the module.

LED information in this section applies to the following VNswitch modules: VNswitch 900EA, VNswitch 900EE, VNswitch 900EX, VNswitch 900FA, VNswitch 900FF, VNswitch 900FX, VNswitch 900LL, and the VNswitch 900XA.

See VNswitch 900EF Leds, for information on the VNswitch 900EF module. See VNswitch 900XX Leds for information on the VNswitch 900XX module.

For information about the LEDs associated with a Modular Media Interface (MMI) card, refer to the card's manual.

VNswitch LED Descriptions

The module's LEDs provide dynamic indications of the module's status. The LEDs can be in various states (on, off, flashing), and can change color (green or yellow) depending on the operational status of the module or the level of activity on the network.

Module LED States

LED Name Off On (Green) On (Yellow) Flashing
Power LED No power or not enough power available in  MultiSwitch 900. Module is receiving power. N/A N/A
Module OK LED Self-test failed or is in progress. Module passed self-test. N/A Indicates a downline load or a nonfatal error.
VNbus Status LED No connection. Module is properly attached to one of the backplane VNbuses. See Upgrade Device help.* (Green)
VNbus is disconnected by management software.
VNbus Activity LED No traffic. N/A Heavy traffic.
See Upgrade Device help.*
(Yellow)
Port is receiving/ transmitting traffic on the backplane.
LDM Port Status LED No link established. Proper link established. N/A Disabled.
LDM  Activity LED No traffic. Indicates heavy traffic. N/A Transmitting or receiving packets.
Port Status LEDs No valid link being received on the port.

No cable is attached.

Port is broken.

Port is enabled and is receiving a valid link. Port failure. (Green)
Port is management disabled for forwarding, but is still receiving a valid link.
Port Activity LEDs No traffic is being   received/ transmitted to the port. Port is enabled onto the front panel and is transmitting or receiving heavy traffic. Port is enabled onto a backplane channel
and is transmitting  or receiving heavy traffic (in a DEChub ONE docking station or MultiSwitch 900).
(Green)
Port is receiving/ transmitting traffic on the front panel.

(Yellow)
Port is receiving/ transmitting traffic on the backplane.

* The VNbus Status and Activity LEDs have different indications during a load state.

Problem Solving Using VNswitch LEDs

When diagnosing a problem with the module, the problem is often indicated by the combined states of the module's LEDs. The following table lists the typical combined states of the LEDs for various error conditions that can occur during initial installation of the device, along with the probable causes.

Note:  If any of the following conditions persist after taking corrective action, either replace the module or contact your DIGITAL service representative.

Symptom Probable Cause Corrective Action
Power LED is off. The module is not receiving +5 Vdc. Check the power status on the Chassis Manager status display.

If the Chassis Manager status display indicates that power is available for the module, press the release lever and reseat or remove the module.

Inspect the module's 48- or 160-pin connector for bent or broken pins. If any are bent or broken, replace the module.

Module OK LED is off. Self-test failed. If the LED does not light within 3 minutes, lift and reseat the release lever momentarily to repeat the self-test.
Module OK LED is flashing, but the module continues to operate normally. A nonfatal error occurred. Contact your service representative.
VNbus Status LED is off. No connection. Check that the module is properly attached to one of the backplane VNbuses and that the VNbus is connected by management software.
VNbus Activity LED is off.
  1. Low traffic activity or no traffic activity exists.
  2. The module or any unit in the MultiSwitch 900 may not be connected to an active VNbus channel.
  3. If the module is connected to an active VNbus and the VNbus Activity LED is off, the module is defective.
  1. Ensure that traffic activity exists. If the VNbus Activity LED fails to turn on, then turn the module off momentarily by removing it from the power supply. Check that the VNbus Activity LED blinks momentarily during the LED power-up self-test.
  2. Connect a known active VNbus channel to any unit in the MultiSwitch 900.
  3. Replace the module.
LDM Port Status LED is off. No link established. Check that a proper link is established.
Port Status LEDs are off. No cable attached or cable is broken. Check cable type.
Port Activity LEDs are off.
  1. Low or no port activity exists.
  2. Ensure that activity exists on the cable. If the LED still fails to turn on, the module is defective.
  1. Ensure that the port is present. If the Port Activity LED still fails to turn on and off, then turn the module off momentarily by removing it from the power supply. Check that the Port Activity LEDs blink momentarily during the LED power-up self-test.
  2. Replace the module.