Chapter 3. Operation

LEDs

Network Status LEDs

The network status LEDs display the operational condi- tion of the network interface located on the controller board in the unit.

LED

Color

Indicates that...

Display

 

 

 

 

 

 

 

 

OK

Green

The operation is in the normal mode and no

 

 

errors have been detected.

 

 

 

Test

Yellow

The network interface is operating in a test

 

 

mode. This includes a self-test or a test

 

 

loopback. When lighted, this LED also

 

 

indicates that normal data flow is not

 

 

occurring on the network interface.

 

 

 

Error

Red

An error has occurred, such as a BPV, OOF,

 

 

or CRC.

 

 

 

Alarm

Red

An alarm condition has been detected. Any

 

 

alarm condition will activate the alarm relay

 

 

for the external alarm device. When the

 

 

alarm condition is no longer valid, the OK

 

 

LED activates (turns on). To view an alarm

 

 

condition, select the active alarm menu item.

 

 

 

If the alarm conditions have been corrected, the alarm which caused the activation of the Alarm LED can be viewed under the UNIT HISTORY menu.

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TDU 120e User Manual

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ADTRAN TDU 120e user manual LEDs, Led