VNswitch 900XX LEDs
This section describes how to diagnose and solve problems using the
light-emitting diode (LED) displays on the front panel of the VNswitch 900XX module.
For information about the LEDs associated with a 100 Mb/s Fast Ethernet Modular Media
Interface (MMI) card, refer to the card's manual.
VNswitch 900XX 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.
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. |
N/A |
(Green)
Port is management disabled. |
Port Activity LEDs |
No traffic is being
received/ transmitted to the port. |
Indicates heavy
traffic. |
N/A |
(Green)
Port is receiving/ transmitting traffic on the front panel. |
* The VNbus Status and Activity LEDs have different
indications during a load state.
Problem Solving Using VNswitch 900XX 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. |
- Low traffic activity or no traffic activity exists.
- The module or any unit in the MultiSwitch 900 may not be connected to an active VNbus
channel.
- If the module is connected to an active VNbus and the VNbus Activity LED is off, the
module is defective.
|
- 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.
- Connect a known active VNbus channel to any unit in the MultiSwitch 900.
- 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. |
- Low or no port activity exists.
- Ensure that activity exists on the cable. If the LED still fails to turn on, the module
is defective.
|
- 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.
- Replace the module.
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