VNswitch 900EF LEDs
This section describes how to diagnose and solve problems using the
light-emitting diode (LED) displays on the front panel of the VNswitch 900EF module.
For detailed information about the LEDs associated with an FDDI Modular Media Interface
(MMI) card, refer to the card's manual.
VNswitch 900EF 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 |
Indicates 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 high
traffic. |
N/A |
Transmitting or
receiving packets. |
Port Status LEDs |
No valid link is
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. |
ModPMD Status LED
(MM version only) |
Tree topology.
M-type port. |
Tree topology.
S-type port. |
Diagnostics
detected a fault. |
(Green)
Dual ring. A port or B port. |
ModPMD PHY LED (MM
version only) |
Port is unable to
receive, or ready to connect (if no cable is present). |
Card is working
properly, and a link is established. |
The link error
state is exceeded. |
(Yellow)
An illegal connection exists.(Alternately Green
and Yellow)
The card is in standby (dual-homing) mode. |
* The VNbus Status and Activity LEDs have different
indications during a load state.
Problem Solving Using VNswitch 900EF 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.
|
Problem Solving Using the ModPMD LEDs
The following table lists the typical combined states of the ModPHY LEDs for various
error conditions that can occur during initial installation of the device, along with
probable causes and corrective actions to take.
Symptom |
Probable Cause |
Corrective Action |
FRU LED is off. |
Tree topology, M-type port. |
No action necessary. |
FRU LED is green. |
Tree topology, S-type port. |
No action necessary. |
FRU LED is yellow. |
The diagnostics detected a
fault. |
If possible, insert a card into
another slot to determine whether the card or the host module contains the fault. If
the card contains the fault, replace your card or contact your DIGITAL
representative. |
FRU LED is blinking green. |
Dual ring, A port or B port. |
No action necessary. |
PHY LED is off |
The port is unable to receive
from the neighboring switch or station indicating that a connection problem might
exist. |
Check your connection. |
PHY LED is green. |
The card is working properly
and a link is established. |
No action necessary. |
PHY LED is yellow. |
The link error rate is
exceeded. |
Perform loopback testing to
isolate the problem. |
PHY LED is blinking green. |
Card is disabled by
network management. |
Enable the card, if necessary. |
PHY LED is blinking yellow. |
An illegal connection exists. |
Check the connections. |
PHY LED is alternately blinking
green and yellow. |
The card is in standby
(dual-homing) mode. |
No action necessary. |
|